Life History and Status of the Appalachian Gametophyte Fern by David D
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Gymnosperms the MESOZOIC: ERA of GYMNOSPERM DOMINANCE
Chapter 24 Gymnosperms THE MESOZOIC: ERA OF GYMNOSPERM DOMINANCE THE VASCULAR SYSTEM OF GYMNOSPERMS CYCADS GINKGO CONIFERS Pinaceae Include the Pines, Firs, and Spruces Cupressaceae Include the Junipers, Cypresses, and Redwoods Taxaceae Include the Yews, but Plum Yews Belong to Cephalotaxaceae Podocarpaceae and Araucariaceae Are Largely Southern Hemisphere Conifers THE LIFE CYCLE OF PINUS, A REPRESENTATIVE GYMNOSPERM Pollen and Ovules Are Produced in Different Kinds of Structures Pollination Replaces the Need for Free Water Fertilization Leads to Seed Formation GNETOPHYTES GYMNOSPERMS: SEEDS, POLLEN, AND WOOD THE ECOLOGICAL AND ECONOMIC IMPORTANCE OF GYMNOSPERMS The Origin of Seeds, Pollen, and Wood Seeds and Pollen Are Key Reproductive SUMMARY Innovations for Life on Land Seed Plants Have Distinctive Vegetative PLANTS, PEOPLE, AND THE Features ENVIRONMENT: The California Coast Relationships among Gymnosperms Redwood Forest 1 KEY CONCEPTS 1. The evolution of seeds, pollen, and wood freed plants from the need for water during reproduction, allowed for more effective dispersal of sperm, increased parental investment in the next generation and allowed for greater size and strength. 2. Seed plants originated in the Devonian period from a group called the progymnosperms, which possessed wood and heterospory, but reproduced by releasing spores. Currently, five lineages of seed plants survive--the flowering plants plus four groups of gymnosperms: cycads, Ginkgo, conifers, and gnetophytes. Conifers are the best known and most economically important group, including pines, firs, spruces, hemlocks, redwoods, cedars, cypress, yews, and several Southern Hemisphere genera. 3. The pine life cycle is heterosporous. Pollen strobili are small and seasonal. Each sporophyll has two microsporangia, in which microspores are formed and divide into immature male gametophytes while still retained in the microsporangia. -
Gametophyte Morphology and Development of Six Species of Pteris (Pteridaceae) from Java Island Indonesia
THE JOURNAL OF TROPICAL LIFE SCIENCE OPEN ACCESS Freely available online VOL. 5, NO. 2, pp. 98-104, May, 2015 Gametophyte Morphology and Development of Six Species of Pteris (Pteridaceae) from Java Island Indonesia Dwi Sunarti Puspitasari1, Tatik Chikmawati2*, Titien Ngatinem Praptosuwiryo3 1Plant Biology Graduate Program, Department of Biology, Faculty of Mathematics and Natural Sciences, Bogor Agricultural University, Darmaga Campus, Bogor, Indonesia 2Department of Biology, Faculty of Mathematics and Natural Sciences Bogor Agricultural University, Darmaga Campus, Bogor, Indonesia 3Center for Plant Conservation- Bogor Botanical Gardens, Indonesian Institute of Sciences, Bogor, West Java, Indonesia ABSTRACT The morphology of sporophyte, the type of reproduction, and cytology of Pteris had been reported, while the gametophyte morphology of Pteris in Java island has not been studied yet. The objective of this study was to describe the gametophyte morphology and development of P. biaurita, P. ensiformis, P. exelsa, P. longipinnula, P. tripartita, and P. vittata in Java island. Spores were obtained from fertile leaves of Pteris plants originated from several locations in Java island. The number of spores per sporangium was counted from fresh fertile leaves with mature sporangia. As much as 0.002 g spores was sown in a transparent box with sterile medium contain of ver- miculite, sphagnum moss, and perlite with ratio 2:2:1. The gametophyte development of each species was observed under a microscope every 7 days. The spores of P. ensiformis were germinated faster, ten days after sowing, while the spores of P. longipinnula were germinated slower, 18 days after sowing. The pattern of spore germination is Vittaria-type. -
The Origin of Alternation of Generations in Land Plants
Theoriginof alternation of generations inlandplants: afocuson matrotrophy andhexose transport Linda K.E.Graham and LeeW .Wilcox Department of Botany,University of Wisconsin, 430Lincoln Drive, Madison,WI 53706, USA (lkgraham@facsta¡.wisc .edu ) Alifehistory involving alternation of two developmentally associated, multicellular generations (sporophyteand gametophyte) is anautapomorphy of embryophytes (bryophytes + vascularplants) . Microfossil dataindicate that Mid ^Late Ordovicianland plants possessed such alifecycle, and that the originof alternationof generationspreceded this date.Molecular phylogenetic data unambiguously relate charophyceangreen algae to the ancestryof monophyletic embryophytes, and identify bryophytes as early-divergentland plants. Comparison of reproduction in charophyceans and bryophytes suggests that the followingstages occurredduring evolutionary origin of embryophytic alternation of generations: (i) originof oogamy;(ii) retention ofeggsand zygotes on the parentalthallus; (iii) originof matrotrophy (regulatedtransfer ofnutritional and morphogenetic solutes fromparental cells tothe nextgeneration); (iv)origin of a multicellularsporophyte generation ;and(v) origin of non-£ agellate, walled spores. Oogamy,egg/zygoteretention andmatrotrophy characterize at least some moderncharophyceans, and arepostulated to represent pre-adaptativefeatures inherited byembryophytes from ancestral charophyceans.Matrotrophy is hypothesizedto have preceded originof the multicellularsporophytes of plants,and to represent acritical innovation.Molecular -
Seedless Plants Key Concept Seedless Plants Do Not Produce Seeds 2 but Are Well Adapted for Reproduction and Survival
Seedless Plants Key Concept Seedless plants do not produce seeds 2 but are well adapted for reproduction and survival. What You Will Learn When you think of plants, you probably think of plants, • Nonvascular plants do not have such as trees and flowers, that make seeds. But two groups of specialized vascular tissues. plants don’t make seeds. The two groups of seedless plants are • Seedless vascular plants have specialized vascular tissues. nonvascular plants and seedless vascular plants. • Seedless plants reproduce sexually and asexually, but they need water Nonvascular Plants to reproduce. Mosses, liverworts, and hornworts do not have vascular • Seedless plants have two stages tissue to transport water and nutrients. Each cell of the plant in their life cycle. must get water from the environment or from a nearby cell. So, Why It Matters nonvascular plants usually live in places that are damp. Also, Seedless plants play many roles in nonvascular plants are small. They grow on soil, the bark of the environment, including helping to form soil and preventing erosion. trees, and rocks. Mosses, liverworts, and hornworts don’t have true stems, roots, or leaves. They do, however, have structures Vocabulary that carry out the activities of stems, roots, and leaves. • rhizoid • rhizome Mosses Large groups of mosses cover soil or rocks with a mat of Graphic Organizer In your Science tiny green plants. Mosses have leafy stalks and rhizoids. A Journal, create a Venn Diagram that rhizoid is a rootlike structure that holds nonvascular plants in compares vascular plants and nonvas- place. Rhizoids help the plants get water and nutrients. -
THE DIVERSITY of EPIPHYTIC FERN on the OIL PALM TREE (Elaeis Guineensis Jacq.) in PEKANBARU, RIAU
JURNAL BIOLOGI XVII (2) : 51 - 55 ISSN : 1410 5292 THE DIVERSITY OF EPIPHYTIC FERN ON THE OIL PALM TREE (Elaeis guineensis Jacq.) IN PEKANBARU, RIAU KEANEKARAGAMAN JENIS PAKU EPIFIT YANG TUMBUH PADA BATANG KELAPA SAWIT (Elaeis guineensis Jacq.) DI PEKANBARU, RIAU NERY SOFIYANTI Department of Biology, Faculty of Mathematic and Resource Sciences, University of Riau. Kampus Bina Widya Simpang Baru, Panam, Pekanbaru, Riau. Email: [email protected] INTISARI Kelapa sawit (Elaeis guineensis) merupakan salah satu komoditas utama di Provinsi Riau. Secara morfologi, batang kelapa sawit mempunyai lingkungan yang sesuai bagi pertumbuhan paku-pakuan epifit, karena bagian pangkal tangkai daun yang melebar sehingga dapat menampung serasah organik dan materi anorganik lainnya. Tujuan dari kajian ini adalah untuk mengetahui keanekaragaman jenis paku epifit yang tumbuh pada batang kelapa sawit. Sebanyak 125 individu kelapa sawit dari tujuh area kajian di Pekanbaru, Riau telah diteliti. Jumlah jenis paku epifit yang diidentifikasi pada penelitian ini adalah 16 jenis yang tergolong enam famili. Kata kunci : paku epifit, kelapa sawit, Pekanbaru ABSTRACT Oil palm (Elaeis guineensis) is one main commodity in Riau Province. Morphologically, the trunk of oil palm has suitable environment to the growth of epiphytic fern, due to its broaden base of petiole that may accumulate organic and inorganic debris. The objective of this study was to investigate the diversity of epiphytic fern on the oil palm tree. A total of 125 oil palm trees from seven study sites in Pekanbaru, Riau were observed. The number of epiphytic ferns identified in this study was 16 species belongs to six families. Keyword: epiphytic fern, oil palm tree, Pekanbaru INTRODUCTION flowers. -
Proceedings of the Indiana Academy of Science
The Fern Genera Vittaria and Trichomanes in Indiana George Yatskievych' Department of Biology Indiana University Bloomington, Indiana 47405 Michael A. Homoya Indiana Department of Natural Resources Indianapolis, Indiana 46204 Donald R. Farrar Department of Botany Iowa State University Ames, Iowa 50011 When Deam's Flora of Indiana (4) was first published in 1940, it included 57 species of pteridophytes in 24 genera. Ten years later, Clevenger (2) reported 61 total species, still in 24 genera. Today a taxonomically conservative count would yield ca. 73 species in 26 genera. Two self-evident reasons account for the increased number of pteridophytes now recognized to grow in Indiana. The first is that our understanding of species limits among temperate North American ferns has changed dramatically since the publication of Deam's flora, with an increasingly large number of taxonomic and evolutionary studies on these plants (e.g., 12, 21). In addition, new distributional records have resulted from continuing field work by a number of collectors in the state (e.g., 10, 13). The realiza- tion that our knowledge of Indiana's fern flora remains incomplete and inexact for many taxa has prompted this report, which concerns three taxa in two genera newly found in the state in recent years. Vittaria The genus Vittaria (Vittariaceae) comprises ca. 50 primarily epiphytic tropical species (20), of which V. lineata J. Smith, whose range presently extends to northern Florida, was once thought to be the only extratropical member. It is now known that gametophytes of a Vittaria species exist independently of the sporophyte generation and are distributed as far north as northern Ohio and southwestern New York (8, 18). -
How Prevalent Is Crassulacean Acid Metabolism Among Vascular Epiphytes?
Oecologia (2004) 138: 184-192 DOI 10.1007/s00442-003-1418-x ECOPHYSIOLOGY Gerhard Zotz How prevalent is crassulacean acid metabolism among vascular epiphytes? Received: 24 March 2003 / Accepted: 1Í September 2003 / Published online: 31 October 2003 © Springer-Verlag 2003 Abstract The occurrence of crassulacean acid metabo- the majority of plant species using this water-preserving lism (CAM) in the epiphyte community of a lowland photosynthetic pathway live in trees as epiphytes. In a forest of the Atlantic slope of Panama was investigated. I recent review on the taxonomic occurrence of CAM, hypothesized that CAM is mostly found in orchids, of Winter and Smith (1996) pointed out that Orchidaceae which many species are relatively small and/or rare. Thus, present the greatest uncertainty concerning the number of the relative proportion of species with CAM should not be CAM plants. This family with >800 genera and at least a good indicator for the prevalence of this photosynthetic 20,000 species (Dressier 1981) is estimated to have 7,000, pathway in a community when expressed on an individual mostly epiphytic, CAM species (Winter and Smith 1996), or a biomass basis. In 0.4 ha of forest, 103 species of which alone would account for almost 50% of all CAM vascular epiphytes with 13,099 individuals were found. As plants. A number of studies, mostly using stable isotope judged from the C isotope ratios and the absence of Kranz techniques, documented a steady increase in the propor- anatomy, CAM was detected in 20 species (19.4% of the tion of CAM plants among local epiphyte floras from wet total), which were members of the families Orchidaceae, tropical rainforest and moist tropical forests to dry forests. -
Mosses and Ferns
Mosses and Ferns • How did they evolve from Protists? Moss and Fern Life Cycles Group 1: Seedless, Nonvascular Plants • Live in moist environments to reproduce • Grow low to ground to retain moisture (nonvascular) • Lack true leaves • Common pioneer species during succession • Gametophyte most common (dominant) • Ex: Mosses, liverworts, hornworts Moss Life Cycle 1)Moss 2) Through water, 3) Diploid sporophyte 4) Sporophyte will gametophytes sperm from the male will grow from zygote create and release grow near the gametophyte will haploid spores ground swim to the female (haploid stage) gametophyte to create a diploid zygote Diploid sporophyte . zygo egg zygo te egg te zygo zygo egg egg te te male male female female female male female male Haploid gametophytes 5) Haploid 6) The process spores land repeats and grow into new . gametophytes . Haploid gametophytesground . sporophyte . zygo egg zygo te egg te zygo zygo egg egg te te male male female female female male female male Haploid gametophytes • Vascular system allows Group 2: Seedless, – Taller growth – Nutrient transportation Vascular Plants • Live in moist environments – swimming sperm • Gametophyte stage – Male gametophyte: makes sperm – Female gametophyte: makes eggs – Sperm swims to fertilize eggs • Sporophyte stage – Spores released into air – Spores land and grow into gametophyte • Ex: Ferns, Club mosses, Horsetails Fern Life Cycle 1) Sporophyte creates and releases haploid spores Adult Sporophyte . ground 2) Haploid spores land in the soil . ground 3) From the haploid spores, gametophyte grows in the soil Let’s zoom in Fern gametophytes are called a prothallus ground 4) Sperm swim through water from the male parts (antheridium) to the female parts (archegonia)…zygote created Let’s zoom back out zygo zygo egg egg te te zygo egg te 5) Diploid sporophyte grows from the zygote sporophyte Fern gametophytes are called a prothallus ground 6) Fiddle head uncurls….fronds open up 7) Cycle repeats -- Haploid spores created and released . -
Plant Reproduction
AccessScience from McGraw-Hill Education Page 1 of 10 www.accessscience.com Plant reproduction Contributed by: Scott D. Russell Publication year: 2014 The formation of a new plant that is either an exact copy or recombination of the genetic makeup of its parents. There are three types of plant reproduction considered here: (1) vegetative reproduction, in which a vegetative organ forms a clone of the parent; (2) asexual reproduction, in which reproductive components undergo a nonsexual form of production of offspring without genetic rearrangement, also known as apomixis; and (3) sexual reproduction, in which meiosis (reduction division) leads to formation of male and female gametes that combine through syngamy (union of gametes) to produce offspring. See also: PLANT; PLANT PHYSIOLOGY. Vegetative reproduction Unlike animals, plants may be readily stimulated to produce identical copies of themselves through cloning. In animals, only a few cells, which are regarded as stem cells, are capable of generating cell lineages, organs, or new organisms. In contrast, plants generate or produce stem cells from many plant cells of the root, stem, or leaf that are not part of an obvious generative lineage—a characteristic that has been known as totipotency, or the general ability of a single cell to regenerate a whole new plant. This ability to establish new plants from one or more cells is the foundation of plant biotechnology. In biotechnology, a single cell may be used to regenerate new organisms that may or may not genetically differ from the original organism. If it is identical to the parent, it is a clone; however, if this plant has been altered through molecular biology, it is known as a genetically modified organism (GMO). -
Water Stress and Abscisic Acid Treatments Induce the CAM Pathway in the Epiphytic Fern Vittaria Lineata (L.) Smith
DOI: 10.1007/s11099-014-0047-4 PHOTOSYNTHETICA 52 (3): 404-412, 2014 Water stress and abscisic acid treatments induce the CAM pathway in the epiphytic fern Vittaria lineata (L.) Smith B.D. MINARDI+, A.P.L. VOYTENA, M. SANTOS, and Á.M. RANDI Plant Physiology Laboratory, Department of Botany, Federal University of Santa Catarina, Florianópolis, SC– 88049-900, CP 476, Brazil. Abstract Among various epiphytic ferns found in the Brazilian Atlantic Forest, we studied Vittaria lineata (L.) Smith (Polypodiopsida, Pteridaceae). Anatomical characterization of the leaf was carried out by light microscopy, fluorescence microscopy, and scanning electron microscopy. V. lineata possesses succulent leaves with two longitudinal furrows on the abaxial surface. We observed abundant stomata inside the furrows, glandular trichomes, paraphises, and sporangia. We examined malate concentrations in leaves, relative water content (RWC), photosynthetic pigments, and chlorophyll (Chl) a fluorescence in control, water-deficient, and abscisic acid (ABA)-treated plants. Plants subjected to drought stress (DS) and treated by exogenous ABA showed significant increase in the malate concentration, demonstrating nocturnal acidification. These findings suggest that V. lineata could change its mode of carbon fixation from C3 to the CAM pathway in response to drought. No significant changes in RWC were observed among treatments. Moreover, although plants subjected to stress treatments showed a significant decline in the contents of Chl a and b, the concentrations of carotenoids were stable. Photosynthetic parameters obtained from rapid light curves showed a significant decrease after DS and ABA treatments. Additional key words: chlorophyll fluorescence; malate; morphoanatomy; photosynthetic pathway; pigments. Introduction Ferns are extensively distributed worldwide. -
Evolution Along the Crassulacean Acid Metabolism Continuum
Review CSIRO PUBLISHING www.publish.csiro.au/journals/fpb Functional Plant Biology, 2010, 37, 995–1010 Evolution along the crassulacean acid metabolism continuum Katia SilveraA, Kurt M. Neubig B, W. Mark Whitten B, Norris H. Williams B, Klaus Winter C and John C. Cushman A,D ADepartment of Biochemistry and Molecular Biology, MS200, University of Nevada, Reno, NV 89557-0200, USA. BFlorida Museum of Natural History, University of Florida, Gainesville, FL 32611-7800, USA. CSmithsonian Tropical Research Institute, PO Box 0843-03092, Balboa, Ancón, Republic of Panama. DCorresponding author. Email: [email protected] This paper is part of an ongoing series: ‘The Evolution of Plant Functions’. Abstract. Crassulacean acid metabolism (CAM) is a specialised mode of photosynthesis that improves atmospheric CO2 assimilation in water-limited terrestrial and epiphytic habitats and in CO2-limited aquatic environments. In contrast with C3 and C4 plants, CAM plants take up CO2 from the atmosphere partially or predominantly at night. CAM is taxonomically widespread among vascular plants andis present inmanysucculent species that occupy semiarid regions, as well as intropical epiphytes and in some aquatic macrophytes. This water-conserving photosynthetic pathway has evolved multiple times and is found in close to 6% of vascular plant species from at least 35 families. Although many aspects of CAM molecular biology, biochemistry and ecophysiology are well understood, relatively little is known about the evolutionary origins of CAM. This review focuses on five main topics: (1) the permutations and plasticity of CAM, (2) the requirements for CAM evolution, (3) the drivers of CAM evolution, (4) the prevalence and taxonomic distribution of CAM among vascular plants with emphasis on the Orchidaceae and (5) the molecular underpinnings of CAM evolution including circadian clock regulation of gene expression. -
A Revised Family-Level Classification for Eupolypod II Ferns (Polypodiidae: Polypodiales)
TAXON 61 (3) • June 2012: 515–533 Rothfels & al. • Eupolypod II classification A revised family-level classification for eupolypod II ferns (Polypodiidae: Polypodiales) Carl J. Rothfels,1 Michael A. Sundue,2 Li-Yaung Kuo,3 Anders Larsson,4 Masahiro Kato,5 Eric Schuettpelz6 & Kathleen M. Pryer1 1 Department of Biology, Duke University, Box 90338, Durham, North Carolina 27708, U.S.A. 2 The Pringle Herbarium, Department of Plant Biology, University of Vermont, 27 Colchester Ave., Burlington, Vermont 05405, U.S.A. 3 Institute of Ecology and Evolutionary Biology, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan 4 Systematic Biology, Evolutionary Biology Centre, Uppsala University, Norbyv. 18D, 752 36, Uppsala, Sweden 5 Department of Botany, National Museum of Nature and Science, Tsukuba 305-0005, Japan 6 Department of Biology and Marine Biology, University of North Carolina Wilmington, 601 South College Road, Wilmington, North Carolina 28403, U.S.A. Carl J. Rothfels and Michael A. Sundue contributed equally to this work. Author for correspondence: Carl J. Rothfels, [email protected] Abstract We present a family-level classification for the eupolypod II clade of leptosporangiate ferns, one of the two major lineages within the Eupolypods, and one of the few parts of the fern tree of life where family-level relationships were not well understood at the time of publication of the 2006 fern classification by Smith & al. Comprising over 2500 species, the composition and particularly the relationships among the major clades of this group have historically been contentious and defied phylogenetic resolution until very recently. Our classification reflects the most current available data, largely derived from published molecular phylogenetic studies.