DOCSLIB.ORG

Using DNA-Based Techniques to Identify Hybrids Among Linear-Leaved Potamogeton Plants Collected in China

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Using DNA-Based Techniques to Identify Hybrids Among Linear-Leaved Potamogeton Plants Collected in China Journal of Systematics and Evolution 48 (4): 265–270 (2010) doi: 10.1111/j.1759-6831.2010.00089.x Using DNA-based techniques to identify hybrids among linear-leaved Potamogeton plants collected in China ∗ ∗ 1,2Zhi-Yuan DU 1,2Chun-Feng YANG 1,2Jin-Ming CHEN ,† 3You-Hao GUO ,† 4Akeem Babalola KADIRI 1(Key Laboratory of Aquatic Botany and Watershed Ecology, Chinese Academy of Sciences, Wuhan 430074, China) 2(Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China) 3(Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China) 4(Department of Botany and Microbiology, University of Lagos, Lagos 100213, Nigeria) Abstract It is well known that interspecific hybrids occur in the genus Potamogeton. The linear-leaved Potamogeton species commonly have highly variable morphological characteristics. Their hybrids often show similar vegetative characters to their parental species and their identification based solely on morphology is not always conclusive. In order to clarify whether there are any hybrids from the linear-leaved Potamogeton plants collected in China, we used internal transcribed spacers (ITS) of nuclear ribosomal DNA and chloroplast rbcL gene sequences to identify the hybrids. Using ITS sequence additivity, we identified four hybrids, namely P.orientalis (P.pusillus × P.oxyphyllus), P. pusillus × P. berchtoldii, P. foliosus × P. octandrus, and P. cristatus × P. octandrus. The latter three hybrids should be considered as new hybrids in Potamogeton. The maternal parents of the four hybrids were confirmed using chloroplast rbcL gene sequences. Key words hybridization, internal transcribed spacer, Potamogeton, rbcL. The pondweeds Potamogeton L. (Potamoget- species) in Potamogeton (excluding Stuckenia;Guo& onaceae) are one of the most important plant genera Li, 1992; Wiegleb & Kaplan, 1998). Because of the in the aquatic environment (Haynes, 1975). As defined relatively frequent hybridization in Potamogeton, tradi- traditionally, the genus consists of two subgenera, Pota- tional morphologically based taxonomies are compli- mogeton and Coleogeton (Reichb.) Raunk. (Wiegleb & cated. Until now, only a few Potamogeton hybrids have Kaplan, 1998). Based on recent taxonomic treatment been identified in China (e.g. Wang et al., 2007; Zhang of Potamogeton, the subgenera Coleogeton has been el- et al., 2008; Du et al., 2009). evated to the generic level, giving it the correct name Over the past 5 years, field, herbarium, and labora- Stuckenia Borner (Lindqvist et al., 2006; Kaplan, 2008). tory studies have been conducted to assess Potamogeton Within the current Potamogeton, two morphological lin- populations in China. As part of these studies, we col- eages have been recognized, broad-leaved species and lected linear-leaved Potamogeton specimens from the linear-leaved species (Iida et al., 2004; Lindqvist et al., northeast, northwest, central, and southwest regions of 2006; Zhang et al., 2008). China. According to the species description of Guo & Potamogeton is a genus well known for the occur- Li (1992), Preston (1995), Wiegleb & Kaplan (1998), rence of interspecific hybrids (Kaplan & Fehrer, 2007). and Kaplan & Stepanek (2003), close inspection of the Wiegleb & Kaplan (1998) reviewed the taxonomic treat- specimens collected indicated that there were eight con- ment of Potamogeton and Stuckenia worldwide and firmed species. However, the linear-leaved Potamogeton assessed the validity of all taxa in these genera. In species commonly have highly variable morphological Potamogeton, hybrids are more likely to occur between characteristics, and their hybrids often show similar veg- species within a lineage than between species from dif- etative characters of their parental species. Thus, iden- ferent lineages (Fant et al., 2003). In China, there are tification of these hybrids on the basis of their mor- approximately 22 species (including eight linear-leaved phology is extremely difficult. Because of the limited number of studies on the identification of linear-leaved Potamogeton hybrids in China, it is not clear whether some hybrids collected during our field investigations Received: 28 December 2009 Accepted: 6 April 2010 have been misidentified as pure species. † These two authors have contributed equally to this study. ∗ Author for correspondence. E-mail: [email protected]; Tel.: +86-27- Because of the immense range of phenotypic plas- 68754775; Fax: +86-27-68752560. ticity of Potamogeton taxa (Kaplan, 2002), some authors C 2010 Institute of Botany, Chinese Academy of Sciences 266 Journal of Systematics and Evolution Vol. 48 No. 4 2010 are skeptical about identifying Potamogeton hybrids manchuriensis A. Bennett) have been recorded in China morphologically and have stressed the need for more (Guo & Li, 1992; Wiegleb & Kaplan, 1998). However, convincing evidence (Les & Philbrick, 1993). In recent we did not find any plants of P. compressus and P. years, molecular techniques have been used to investi- manchuriensis in the areas we investigated in our re- gate the nature of some putative Potamogeton hybrids cent field study. Potamogeton berchtoldii Fieber and P. (Du et al., 2009). Nuclear internal transcribed spacer foliosus Rafinesque are morphologically very similar to (ITS) sequences of hybrids often show superimposed P.pusillus. They have not been recorded in China previ- nucleotides (additive patterns) of both parental species, ously. In our investigations, we collected P. berchtoldii so this region has been widely used to identify Pota- in the northeast and P.foliosus from many sites. In total, mogeton hybrids (Whittall et al., 2000, 2004; Kaplan & eight linear-leaved Potamogeton species were collected Fehrer, 2007). Maternal inheritance of chloroplast (cp) from eight provinces in the northeast, northwest, mid- DNA in the genus Potamogeton was confirmed in ex- dle, and southwest regions of China during 2005 and perimental hybrids (Kaplan & Fehrer, 2006). Thus, the 2008. The localities, taxa, number of samples included chloroplast sequences have been widely used to iden- in the molecular analyses, and GenBank accession num- tify the maternal parent of the hybrids (Fant et al., 2003; bers of the sequences are given in Table 1. In addition, Kaplan & Fehrer, 2007; Iida et al., 2007). In the present Table 1 lists the hybrids that have been confirmed by study, we used nuclear ITS sequences and chloroplast molecular techniques. About 5 g fresh leaves was har- rbcL gene sequences to test whether there are any hy- vested from each plant and dried in a zip lock plastic brids among the linear-leaved Potamogeton plants col- bag containing approximately 80 g silica gel. The sam- lected in China. ples were stored at room temperature until DNA was isolated in the laboratory. 1 Material and methods 1.2 DNA extraction, polymerase chain reaction am- plification, and sequencing 1.1 Plant material Total genomic DNA was extracted from dried A total of eight linear-leaved Potamogeton species leaf tissue using the cetyltrimethylammonium bromide (P.pusillus L., P.oxyphyllus Miquel, P.octandrus Poiret, (CTAB) protocol described by Doyle & Doyle (1990). P. cristatus Regel & Maack, P. acutifolius L., P. ob- The nuclear ITS region sequences were amplified us- tusifolius Mertens & Koch, P. compressus L., and P. ing primers ITS1 and ITS4 (White et al., 1990). The Table 1 Localities, taxa, the number of samples, GenBank accession numbers of sequences, and voucher information Locality Taxon No. ITS rbcL Voucher samples no. Yilan, Heilongjiang Potamogeton berchtoldii Fieber 5 FJ956797 FJ956852 WH0121 Xiaoxingkai Lake, Heilongjiang P.acutifolius L. 3 FJ956800 WH0122 P.obtusifolius Mertens & Koch 3 FJ956799 FJ956854 WH0123 Mishan, Heilongjiang P.octandrus Poiret 3 FJ956785 FJ956840 WH0124 P.foliosus Rafinesque 2 FJ956795 FJ956850 WH0129 Raohe, Heilongjiang P.cristatus Regel & Maack 3 FJ956784 FJ956839 WH0132 Taibai, Shanxi P.pusillus L. 8 FJ956791 FJ956846 WH0135 Yichang, Hubei P.pusillus × P.oxyphyllus 25 FJ956901 & FJ956902 FJ968698 WH0143 Quanken, Congyang, Hubei P.octandrus Poiret 4 FJ956786 FJ956841 WH0125 P.cristatus Regel & Maack 6 FJ956782 FJ956837 WH0133 P.foliosus × P.octandrus 3 FJ956893 & FJ956894 FJ968694 WH0137 P.cristatus × P.octandrus 28 FJ956889 & FJ956890 FJ968692 WH0141 Guikou, Congyang, Hubei P.oxyphyllus Miquel 6 FJ956798 FJ956853 WH0136 P.octandrus Poiret 10 FJ956787 FJ956842 WH0126 P.foliosus × P.octandrus 17 FJ956895 & FJ956896 FJ968695 WH0138 Wuxing, Congyang, Hubei P.octandrus Poiret 5 FJ956788 FJ956843 WH0127 P.cristatus Regel & Maack 1 FJ956783 FJ956838 WH0134 P.foliosus × P.octandrus 13 FJ956897 & FJ956868 FJ968696 WH0139 P.cristatus × P.octandrus 21 FJ956891 & FJ956892 FJ968693 WH0142 Heqing, Yunnan P.foliosus Rafinesque 6 FJ956792 FJ956847 WH0130 P.octandrus Poiret 9 FJ956789 FJ956844 WH0128 P.foliosus × P.octandrus 6 FJ956899 & FJ956900 FJ968697 WH0140 Lijiang, Yunnan P.pusillus × P.berchtoldii 5 FJ956903 & FJ956904 FJ968699 WH0144 Linbao, Henan P.foliosus Rafinesque 6 FJ956793 FJ956848 WH0131 ITS, internal transcribed spacer. C 2010 Institute of Botany, Chinese Academy of Sciences DU et al.: Identification of hybrid linear-leaved Potamogeton 267 chloroplast rbcL gene was amplified using primers 26 where there was a shift in the direct sequencing reading and 1375 described by Iida et al. (2007). The poly- frame between the two ITS types (Whittal et al., 2000, merase chain reaction (PCR) amplification was per- 2004; Kaplan & Fehrer, 2007). For each hybrid pop- formed in 25 μL reaction
Load more

Recommended publications
  • An Updated Checklist of Aquatic Plants of Myanmar and Thailand
    Biodiversity Data Journal 2: e1019 doi: 10.3897/BDJ.2.e1019 Taxonomic paper An updated checklist of aquatic plants of Myanmar and Thailand Yu Ito†, Anders S. Barfod‡ † University of Canterbury, Christchurch, New Zealand ‡ Aarhus University, Aarhus, Denmark Corresponding author: Yu Ito ([email protected]) Academic editor: Quentin Groom Received: 04 Nov 2013 | Accepted: 29 Dec 2013 | Published: 06 Jan 2014 Citation: Ito Y, Barfod A (2014) An updated checklist of aquatic plants of Myanmar and Thailand. Biodiversity Data Journal 2: e1019. doi: 10.3897/BDJ.2.e1019 Abstract The flora of Tropical Asia is among the richest in the world, yet the actual diversity is estimated to be much higher than previously reported. Myanmar and Thailand are adjacent countries that together occupy more than the half the area of continental Tropical Asia. This geographic area is diverse ecologically, ranging from cool-temperate to tropical climates, and includes from coast, rainforests and high mountain elevations. An updated checklist of aquatic plants, which includes 78 species in 44 genera from 24 families, are presented based on floristic works. This number includes seven species, that have never been listed in the previous floras and checklists. The species (excluding non-indigenous taxa) were categorized by five geographic groups with the exception of to reflect the rich diversity of the countries' floras. Keywords Aquatic plants, flora, Myanmar, Thailand © Ito Y, Barfod A. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
    [Show full text]
  • Tropical Australian Water Plants Care and Propagation in Aquaria
    Tropical Australian Water Plants Care and propagation in Aquaria Dave Wilson Aquagreen Phone – 08 89831483 or 0427 212 782 Email – [email protected] 100 Mahaffey Rd Howard Springs NT 0835 Introduction There is a growing interest in keeping native fishes and plants. Part of the developing trend in keeping aquaria and ponds is to set up a mini habitat for selected species from the one place and call it a biotope. Some enthusiasts have indicated that in recent times there is not much technical information for beginners about native Australian aquatic plant growing. Generally, if you can provide good conditions for the plants, the other inhabitants, fish, crustaceans and mollusc will be happy. This will set out water quality management, fertiliser and its management, describe an aquarium system that incorporates technology to achieve a nice aquarium. The fourth part will describe some native plants that can be trialled in the aquarium. Soft water plants Hard Water plants Part 1 - Water Quality - Measuring and Management Most people are familiar with pH, alkalinity, hardness, salinity and temperature. The system described here needs control over these parameters which link in with the fertilisers required for good plant growth. A couple of others that can be measured are phosphate and nitrate. Fertilisers produced from feeding fish can be used and are calculated into the system but are usually in the wrong proportions for good plant growth management. A fresh water planted aquarium does better with a 25% to 50% water change per week, test the water you use for the change to make sure that it is better than the water you have already.
    [Show full text]
  • Wetland Plants of the Townsville − Burdekin
    WETLAND PLANTS OF THE TOWNSVILLE − BURDEKIN Dr Greg Calvert & Laurence Liessmann (RPS Group, Townsville) For Lower Burdekin Landcare Association Incorporated (LBLCA) Working in the local community to achieve sustainable land use THIS PUBLICATION WAS MADE POSSIBLE THROUGH THE SUPPORT OF: Burdekin Shire Council Calvert, Greg Liessmann, Laurence Wetland Plants of the Townsville–Burdekin Flood Plain ISBN 978-0-9925807-0-4 First published 2014 by Lower Burdekin Landcare Association Incorporated (LBLCA) PO Box 1280, Ayr, Qld, 4807 Graphic Design by Megan MacKinnon (Clever Tangent) Printed by Lotsa Printing, Townsville © Lower Burdekin Landcare Association Inc. Copyright protects this publication. Except for purposes permitted under the Copyright Act, reproduction by whatever means is prohibited without prior permission of LBLCA All photographs copyright Greg Calvert Please reference as: Calvert G., Liessmann L. (2014) Wetland Plants of the Townsville–Burdekin Flood Plain. Lower Burdekin Landcare Association Inc., Ayr. The Queensland Wetlands Program supports projects and activities that result in long-term benefits to the sustainable management, wise use and protection of wetlands in Queensland. The tools developed by the Program help wetlands landholders, managers and decision makers in government and industry. The Queensland Wetlands Program is currently funded by the Queensland Government. Disclaimer: This document has been prepared with all due diligence and care, based on the best available information at the time of publication. The authors and funding bodies hold no responsibility for any errors or omissions within this document. Any decisions made by other parties based on this document are solely the responsibility of those parties. Information contained in this document is from a number of sources and, as such, does not necessarily represent government or departmental policy.
    [Show full text]
  • Tracheophyte of Xiao Hinggan Ling in China: an Updated Checklist
    Biodiversity Data Journal 7: e32306 doi: 10.3897/BDJ.7.e32306 Taxonomic Paper Tracheophyte of Xiao Hinggan Ling in China: an updated checklist Hongfeng Wang‡§, Xueyun Dong , Yi Liu|,¶, Keping Ma | ‡ School of Forestry, Northeast Forestry University, Harbin, China § School of Food Engineering Harbin University, Harbin, China | State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing, China ¶ University of Chinese Academy of Sciences, Beijing, China Corresponding author: Hongfeng Wang ([email protected]) Academic editor: Daniele Cicuzza Received: 10 Dec 2018 | Accepted: 03 Mar 2019 | Published: 27 Mar 2019 Citation: Wang H, Dong X, Liu Y, Ma K (2019) Tracheophyte of Xiao Hinggan Ling in China: an updated checklist. Biodiversity Data Journal 7: e32306. https://doi.org/10.3897/BDJ.7.e32306 Abstract Background This paper presents an updated list of tracheophytes of Xiao Hinggan Ling. The list includes 124 families, 503 genera and 1640 species (Containing subspecific units), of which 569 species (Containing subspecific units), 56 genera and 6 families represent first published records for Xiao Hinggan Ling. The aim of the present study is to document an updated checklist by reviewing the existing literature, browsing the website of National Specimen Information Infrastructure and additional data obtained in our research over the past ten years. This paper presents an updated list of tracheophytes of Xiao Hinggan Ling. The list includes 124 families, 503 genera and 1640 species (Containing subspecific units), of which 569 species (Containing subspecific units), 56 genera and 6 families represent first published records for Xiao Hinggan Ling. The aim of the present study is to document an updated checklist by reviewing the existing literature, browsing the website of National Specimen Information Infrastructure and additional data obtained in our research over the past ten years.
    [Show full text]
  • Invasive Aquatic Plants and the Aquarium and Ornamental Pond Industries Shakira Stephanie Elaine Azan
    Ryerson University Digital Commons @ Ryerson Theses and dissertations 1-1-2011 Invasive aquatic plants and the aquarium and ornamental pond industries Shakira Stephanie Elaine Azan Follow this and additional works at: http://digitalcommons.ryerson.ca/dissertations Part of the Plant Sciences Commons Recommended Citation Azan, Shakira Stephanie Elaine, "Invasive aquatic plants and the aquarium and ornamental pond industries" (2011). Theses and dissertations. Paper 818. This Thesis is brought to you for free and open access by Digital Commons @ Ryerson. It has been accepted for inclusion in Theses and dissertations by an authorized administrator of Digital Commons @ Ryerson. For more information, please contact [email protected]. INVASIVE AQUATIC PLANTS AND THE AQUARIUM AND ORNAMENTAL POND INDUSTRIES by Shakira Stephanie Elaine Azan Master of Philosophy, University of the West Indies, Mona Campus, Jamaica, 2002 Bachelor of Science (Hons.), University of the West Indies, Mona Campus, Jamaica, 1997 A thesis presented to Ryerson University in partial fulfilment of the requirements for the degree of Master of Applied Science in the Program of Environmental Applied Science and Management Toronto, Ontario, Canada, 2011 ©Shakira Azan 2011 AUTHOR’S DECLARATION I hereby declare that I am the sole author of this thesis. I authorize Ryerson University to lend this thesis to other institutions or individuals for the purpose of scholarly research. ........................................................................................ I further authorize
    [Show full text]
  • D1002880.Pdf
    Kobe University Repository : Thesis Hybrid origin of potamogeton anguillanus and its genetic and 学位論文題目 ecological diversification(オオササエビモの雑種起源と遺伝的および生 Title 態的多様化) 氏名 飯田, 聡子 Author 専攻分野 博士（理学） Degree 学位授与の日付 2003-03-31 Date of Degree 資源タイプ Thesis or Dissertation / 学位論文 Resource Type 報告番号 甲2880 Report Number 権利 Rights JaLCDOI URL http://www.lib.kobe-u.ac.jp/handle_kernel/D1002880 ※当コンテンツは神戸大学の学術成果です。無断複製・不正使用等を禁じます。著作権法で認められている範囲内で、適切にご利用ください。 PDF issue: 2021-10-05 博 士 論 文 Hybrid origin of Potamogeton anguillanus and its genetic and ecological diversification オオササエビモの雑種起源と遺伝的および生態的多様化 平成 15 年 2 月 神戸大学大学院自然科学研究科 飯 田 聡 子 Contents Pages Summary 1 - 4 Chapter One: Molecular phylogeny and evolution of heterophylly in Japanese Potamogeton 5 - 16 Chapter Two: Origin of genetic diversity of Potamogeton anguillanus, a putative hybrid between P. mal aianus and P. perfoliatus in Lake Biwa, Japan 17 - 37 Chapter Three: Population genetic structure of Potamogeton anguillanus in Lake Shnji, Japan 38 - 42 Chapter Four: Ecological and genetic differentiations in Potamogeton anguillanus with special reference to phenotypic plasticity 43 - 55 Acknowlegements 55 - 56 References 57 - 69 19 Tables 24 Figures 2 Appendixes SUMMARY The genus Potamogeton (Potamogetonaceae) is one of the representative aquatic macrophytes consisting of over 80 species worldwide and 19 species in Japan. The genus Potamogeton shows the remarkable diversification of its morphology and ecology. In the first chapter, molecular phylogenetic analyses of inter-genic spacer region of chloroplast DNA were carried out to examine the relationships among Japanese Potamogeton species. Phylogenetic analyses revealed that Japanese Potamogeton was divided into the species of subgenus Potamogeton and subgenus Coleogeton (Potamogeton pectinatus).
    [Show full text]
  • Latin for Gardeners: Over 3,000 Plant Names Explained and Explored
    L ATIN for GARDENERS ACANTHUS bear’s breeches Lorraine Harrison is the author of several books, including Inspiring Sussex Gardeners, The Shaker Book of the Garden, How to Read Gardens, and A Potted History of Vegetables: A Kitchen Cornucopia. The University of Chicago Press, Chicago 60637 © 2012 Quid Publishing Conceived, designed and produced by Quid Publishing Level 4, Sheridan House 114 Western Road Hove BN3 1DD England Designed by Lindsey Johns All rights reserved. Published 2012. Printed in China 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 ISBN-13: 978-0-226-00919-3 (cloth) ISBN-13: 978-0-226-00922-3 (e-book) Library of Congress Cataloging-in-Publication Data Harrison, Lorraine. Latin for gardeners : over 3,000 plant names explained and explored / Lorraine Harrison. pages ; cm ISBN 978-0-226-00919-3 (cloth : alkaline paper) — ISBN (invalid) 978-0-226-00922-3 (e-book) 1. Latin language—Etymology—Names—Dictionaries. 2. Latin language—Technical Latin—Dictionaries. 3. Plants—Nomenclature—Dictionaries—Latin. 4. Plants—History. I. Title. PA2387.H37 2012 580.1’4—dc23 2012020837 ∞ This paper meets the requirements of ANSI/NISO Z39.48-1992 (Permanence of Paper). L ATIN for GARDENERS Over 3,000 Plant Names Explained and Explored LORRAINE HARRISON The University of Chicago Press Contents Preface 6 How to Use This Book 8 A Short History of Botanical Latin 9 Jasminum, Botanical Latin for Beginners 10 jasmine (p. 116) An Introduction to the A–Z Listings 13 THE A-Z LISTINGS OF LatIN PlaNT NAMES A from a- to azureus 14 B from babylonicus to byzantinus 37 C from cacaliifolius to cytisoides 45 D from dactyliferus to dyerianum 69 E from e- to eyriesii 79 F from fabaceus to futilis 85 G from gaditanus to gymnocarpus 94 H from haastii to hystrix 102 I from ibericus to ixocarpus 109 J from jacobaeus to juvenilis 115 K from kamtschaticus to kurdicus 117 L from labiatus to lysimachioides 118 Tropaeolum majus, M from macedonicus to myrtifolius 129 nasturtium (p.
    [Show full text]
  • Potamogetonaceae, Zosteraceae
    Flora Malesiana, Series I, Volume 16 (2002) 167-216 Potamogetonaceae, Zosteraceae, and Cymodoceaceae 1 C. den Hartog Nijmegen, The Netherlands & G. Wiegleb Cottbus, Germany) Introductionto thesea-grasses (C. den Hartog) In earlier papers the sea-grasses were classifiedwithin two families, the Potamogetona- and the As result of research of all of the ceae Hydrocharitaceae. a thorough genera order Helobiae (Alismatidae) by Tomlinson (1982), it has become evident that the very heterogeneous family Potamogetonaceae had to be split into a number of independent families. The sea-grasses which already had subfamily status, became families in their own right, the Cymodoceaceae the Zosteraceae and the Posidoniaceae (not in Malesia). , , The independence of these families is not contradicted by molecular genetical evidence (Les et al. 1997). According to the new vision the Potamogetonaceae are restricted to the genera Potamogeton, Groenlandia (not in Malesia), and Ruppia; however, there are of its molecular genetic indications that the latter genus may present a family own (Les et al. 1997). Therefore, and because of the comparable role in the vegetation of the dif- ferent introduction to in is here, with to the genera, an sea-grasses general given a Key different families and genera of sea-grasses. The phytochemistry of all these groups is given by R. Hegnauer. The few angiosperms that have penetrated into the marine environment, and are able to fulfiltheir vegetative and generative cycle when completely submerged, are generally known as sea-grasses. The name refers to the superficial resemblance to grasses, be- cause ofthe linear leaves of most of the species. In spite of the fact that the numberof sea-grass species is very small (only 60 to 65), they are of paramount importance in the coastal environment, where, when they occur, they generally form extensive beds.
    [Show full text]
  • INTRODUCTION Aquatic Monocots of Thailand, Mostly in Alismatales
    THAI FOR. BULL. (BOT.) 41: 140–144. 2013. New records of aquatic monocots for the Flora of Thailand: Nechamandra alternifolia (Roxb. ex Wight) Thwaites (Hydrocharitaceae) and Potamogeton octandrus Poiret (Potamogetonaceae) YU ITO1,2,3 ABSTRACT. In the course of revising the aquatic fl ora of Thailand, some noteworthy herbarium specimens were found; those are Nechamandra alternifolia (Roxb. ex Wight) Thwaites (Hydrocharitaceae) and Potamogeton octandrus Poiret (Potamogetonaceae), which are new to the country’s fl ora. The taxonomic notes on the species to distinguish them from the related species in Thailand and neighboring areas are provided. KEY WORDS: aquatic monocots, Nechamandra Planchon, Potamogeton L., Thailand. INTRODUCTION NEW RECORDS Aquatic monocots of Thailand, mostly in Alismatales, have been published in 2001, 2005, Nechamandra alternifolia (Roxb. ex Wight) 2008, and 2012, including Acoraceae (one genus of Thwaites in Enum. Pl. Zeyl.: 332. 1864.— two species: Boyce, 2012), Alismataceae (three Vallisneria alternifolia Roxb. ex Wight in Hook., genera of four species: Haynes, 2001a), Araceae Bot. Miscellany, 2(6): Suppl., 344, t. 11. ante 10 (two genera of eight species: Boyce et al., 2012), Sept. 1831, based on Roxburgh mss. in Mus. East Aponogetonaceae (one genus of one species: Haynes, India Co., n. 996.— Lagarosiphon alternifolius 2001b), Cymodoceaceae (two genera of two species: (Roxb. ex Wight) Druce, Rep. Bot. Exch. Club Haynes, 2001c), Hydrocharitaceae (eight genera of Brit. Isles, 1916: 630.1917. Type: India, Roxburgh, 16 species: Haynes, 2001d), Lemnaceae (four genera Icones Fl. Ind. unpublished plate n.9966 (K). — of four species: Landolt, 2001), Limnocharitaceae Serpicula longifolia Rottler, nom. in sched. India, (two genera of two species: Haynes, 2001e), “Trankebar 1798” (K) — Nechamandra roxburghii Pontederiaceae (two genera of four species: Planch., Ann.
    [Show full text]
  • Freshwater Macrophyte Communities of the Macleay River 2015-2016
    Freshwater Macrophyte Communities of the Macleay River 2015-2016 Final Report to Kempsey Shire Council May 2016 Ben E. Vincent, Sarah Mika and Darren Ryder Freshwater Macrophyte Communities of the Macleay River 2015-2016 Final Report to Kempsey Shire Council May 2016 Mr Ben Vincent, Dr Sarah Mika, A/Prof. Darren Ryder School of Environmental and Rural Science, University of New England, Armidale, NSW, 2351 This report should be cited as: Vincent, B.E., Mika, S. and Ryder, D. (2016). Freshwater Macrophyte Communities of the Macleay River 2015-2016: Final report to Kempsey Shire Council. University of New England, Armidale, Australia. Project contact: Dr Sarah Mika School of Environmental and Rural Science University of New England, Armidale, NSW, 2351 Email: [email protected] Cover Photo: Macleay River at Turners Flat Bridge and accompanying macrophyte bed made up of predominantly native species including: Vallisneria nana, Myriophyllum verrucosum, Potamogeton octandrus, Potomogeton perfoliatus, Hydrilla verticillata, Najas tenuifolia and Elodea canadensis (B. Vincent, 2015). UNE Freshwater Macrophyte Communities of the Macleay River Acknowledgements The authors would like to express their gratitude to the following people who generously gave their time and knowledge. Their assistance made the task of self-sufficient paddling of 201.5 river-kms to map macrophytes possible and enjoyable: Joc Coventry, Armidale Outdoors: river guide, local knowledge, excellent camp cook, and photography John Schmidt, Office of Environment and Heritage:
    [Show full text]
  • An Account of the Species of Potamogeton L. (Potamogetonaceae)
    Folia Geobotanica 33: 241-316, 1998 AN ACCOUNTOF THE SPECIES OF POTAMOGETONL. (POTAMOGETONACEAE) Gerhard Wiegleb1) & Zdenek Kaplan2) 1) Department of General Ecology, BTU Cottbus, POB 10 13 44, D-03013 Cottbus, Germany; tel. +49 355 692291, fax +49 355 692291, E-mail [email protected] 2) Institute of Botany, Academy of Sciences of the Czech Republic, CZ-25243 Pruhonice, Czech Republic; fax +420 2 67750031, E-mail [email protected] Keywords:Descriptions, Hybrids, Key to species, Species list, Synonyms,Taxonomic problems Abstract:An accountof thetaxonomy of thegenus Potamogeton L. withspecial reference to speciesdescription and delimitationis presented.A key to the species is given, basedas far as possibleon vegetativecharacters. Detaileddescriptions are providedfor a total of 69 species which are regardedas sufficientlywell known. Specialemphasis is laid both on a completelist of relevantcharacters as well as on the judgementof their respectivediagnostic values. All importantsynonyms are listed allowingdirect access to most of the relevant taxonomicand floristicPotamogeton literature. 50 confirmedhybrids are listed andassigned to theirputative parentspecies. Questions with respectto the taxalisted are formulated in notes on each of the species.A more generalview and questionson futurePotamogeton research are summarizedin the conclusions. "It is to be regretted that we never arrive to the truth but through some mistake or another" (J.O. Hagstrom 1916) INTRODUCTION Since the days of GRAEBNER(1907) and HAGSTROM(1916) no comprehensivetaxonomic treatmentof the genus Potamogeton L. claiming worldwide validity has been carried out. The work of GRAEBNER(1907) was an attempt to compile all the known taxonomic and phytogeographicinformation about the genus, althoughP. Graebnerhimself never carriedout importanttaxonomic work on the genus Potamogeton.In contrast,J.O.
    [Show full text]
  • POTAMOGETON.Even Though It Has Lavania (1 979) Reported Epidermal Structure Been Criticized by St
    BULL. BOT. SURV.INDIA Vol. 43,Nos. 1-4 :pp. 151-194,2001 A REVISION OF FAMILY POTAMOGETONACEAE OF INDIA Botanical Survey of India, Pune ABSTRACT 'Potamogetonaceae' includes 2 genera and ca 100 species distributed in temperate and tropical regions of World. The present paper deals with its 2 genera viz., POTA~OGETONL. including 17 species and 2 varieties and GROENLAND~AGay with 1 species represented in India. Key to genera, subgenera and species as well as necessary illustrations are given for clear identity. Short description of each species including its correct binomial, basionym if any and synonyms, morphological characters, phenology, distribution in India as well as world, ecological notes and uses if any are provided. Specimens examined and approved acronyms of the herbaria where the specimens are deposited are cited. INTRODUCTION by Dumort in 1827. Formerly the family was included under Najadales by Bentham & The family Potamogetonaceae is Hooker f (1880) and J. D. Hooker (1893). represented by 2 genera viz. POTAMOGETONL. Later on Rendle (1904) placed it under including 17 species and two varieties and Helobiales. Hutchinson (1960) placed the GROENLANDIAGay with 1 species. Genus family under Potamogetonales and POTAMWETONI,. constitutes a natural genus segregated family Potamogetonaceae from with about 100 species (Airy Shaw, 1966), Ruppiaceae based on its fresh water habit, wide spread throughout the world except in flower's perianth with 4 free clawed segments polar regions, while GROENLAND~AGay is arranged valvately, lateral ovules and sessile restricted to W. Asia, N. W. Africa, N. fruiting carpels. America, Syria and Turkey. Potamogetonaceae is worked out by Potamogetonaceae, was first established number of Indian and foreign wotlters at Date of receipt :03/01/2001, Date of acceptance : 31110/2001.
    [Show full text]