Ecology of Lianas

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Ecology of Lianas Trim Size: 189mm x 246mm Schnitzer ffirs.tex V3 - September 10, 2014 7:15 A.M. P. iii ECOLOGY OF LIANAS Edited by Stefan A. Schnitzer University of Wisconsin–Milwaukee, WI, USA Frans Bongers Wageningen University and Research Centre, The Netherlands Robyn J. Burnham University of Michigan, MI, USA Francis E. Putz University of Florida, FL, USA Trim Size: 189mm x 246mm Schnitzer ffirs.tex V3 - September 10, 2014 7:15 A.M. P. iv This edition frst published 2015 © 2015 by John Wiley & Sons, Ltd Registered offce: John Wiley & Sons, Ltd, The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, UK Editorial offces: 9600 Garsington Road, Oxford, OX4 2DQ, UK The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, UK 111 River Street, Hoboken, NJ 07030-5774, USA For details of our global editorial offces, for customer services and for information about how to apply for permission to reuse the copyright material in this book please see our website at www.wiley.com/wiley-blackwell. The right of the authors to be identifed as the authors of this work has been asserted in accordance with the UK Copyright, Designs and Patents Act 1988. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by the UK Copyright, Designs and Patents Act 1988, without the prior permission of the publisher. Designations used by companies to distinguish their products are often claimed as trademarks. All brand names and product names used in this book are trade names, service marks, trademarks or registered trademarks of their respective owners. The publisher is not associated with any product or vendor mentioned in this book. Limit of Liability/Disclaimer of Warranty: While the publisher and author(s) have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifcally disclaim any implied warranties of merchantability or ftness for a particular purpose. It is sold on the understanding that the publisher is not engaged in rendering professional services and neither the publisher nor the author shall be liable for damages arising herefrom. If professional advice or other expert assistance is required, the services of a competent professional should be sought. Library of Congress Cataloging-in-Publication Data has been applied for. A catalogue record for this book is available from the British Library. Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic books. Cover image: A large Bauhina refexa (Fabaceae) liana branching into numerous canopy trees in a Panamanian secondary forest © S.A. Schnitzer Set in 9/11 Photina by Laserwords Pvt Ltd, Chennai, India 12015 Chapter 19 LIANA ANATOMY: A BROAD PERSPECTIVE ON STRUCTURAL EVOLUTION OF THE VASCULAR SYSTEM Veronica Angyalossy, Marcelo R. Pace, and André C. Lima Instituto de Biociências, Universidade de São Paulo, São Paulo (SP), Brazil Ecology of Lianas, First Edition. Edited by Stefan A. Schnitzer, Frans Bongers, Robyn J. Burnham, and Francis E. Putz. ©2015JohnWiley&Sons,Ltd.Published2015byJohnWiley&Sons,Ltd. Companion Website: www.wiley.com/go/schnitzer/lianas 253 254 Liana anatomy, physiology, and biomechanics OVERVIEW new data that show how the vascular anatomy of lianas has evolved and diversifed, and how lianas The vascular system of lianas exhibits a number of respond to environmental cues. A neotropical bias will shared features that result from convergent evolution be evident inasmuch as this is our research expertise, and are independent of their taxonomic affnities. In though aspects of paleotropical lianas are also covered this chapter we explore the vascular system of lianas based on the literature (Obaton 1960; Rajput & Rao in major lineages addressing different aspects of their 1999, 2003; Rajput et al. 2009; Patil et al. 2011). An anatomy, development, seasonal growth, and evolu- Appendix of glossary terms is also given. tion. Since lianas are twining plants that climb in the The lianescent habit evolved many times during search of light, various special features favor this habit the evolutionary history of plants (Gentry 1991; and guarantee an effcient fuid conduction through- Burnham 2009; Spicer & Groover 2010; Isnard & out their long stems. Both xylem and phloem of lianas Feild, Chapter 17 in this volume), being present in are conspicuous for their wide conducting cells. In lycophytes, monilophytes (ferns), fossil pteridosperms, xylem it is also common to fnd a reduced volume of gymnosperms and angiosperms (Fig. 19.1). Several fbers associated with an increased amount of axial convergences evolved along with these multiple ori- parenchyma. The fexibility required to twine seems gins, including the development of modifed organs to have been facilitated by the widespread presence specialized for climbing, such as tendrils, spines, or of variant secondary growth, which derives from the adventitious roots that enable vines to reach the activity of one or multiple cambia. The evolution of canopy (Darwin 1865; Schenck 1892; Isnard & Silk cambial variants in different lineages seems to have 2009). Additionally, the development of a highly spe- led to an increase in anatomical complexity in lineages cialized vascular system has been key to the success of in which variants occur. Cambial variants also affect lianas, and this is the focus of this chapter. The vascular xylem differentiation and seasonal response to envi- system of lianas is special since scandent plants must ronmental cues. Lianas may have active cambia for cope with very specifc physical constraints inherent to a very short period of time, from two months to up their habit, including water transport along extremely to a year, most likely a taxon-dependent feature. The long stems (Isnard & Feild, Chapter 17 in this vol- vascular system of lianas provides a wealth of features ume), and the demand for fexibility to accommodate to explore the link between habit, development, and twining (or circumnutation). Lianas do not support the evolution of complex anatomies. their own body, but instead use external supports, usually other plants, as the means to reach the canopy and keep their bodies erect, a characteristic that gave INTRODUCTION: THE UNIQUE them the epithet of “structural parasites” (Stevens VASCULAR SYSTEM OF LIANAS 1987). The fact that lianas are not self-supporting has The study of the vascular system of lianas has a enabled them, along their evolutionary trajectory, long history. It fourished in the works of Heinrich to favor conduction and fexibility at the expense of Schenck (1892, 1893), who traveled from Germany to mechanical stiffness. This reliance on host support Brazil and compiled a treatise on both morphological may explain why lianas have narrower stems than (Schenck 1892) and anatomical aspects (Schenck trees, even though they frequently sustain a leaf area 1893) of lianas. Most textbooks dealing with liana comparable to that of trees (Ewers & Fisher 1991). anatomy subsequently used Schenck’s work and his The broad canopies of lianas, in turn, are only made detailed hand-line drawings as a basis for their treat- possible by the development of a highly specialized ments (Solereder 1908; Boureau 1957; Metcalfe & vascular system with very wide vessels (or wider than Chalk 1950). Most recently, Obaton (1960) on lianas those from closely related self-supporting species), low of Africa, and Carlquist (1991, and references therein) density, and intermixed soft and stiff tissues, features on lianas of different continents, have introduced a that ensure both optimal water conduction, fexibility, large volume of new data, enriching the knowledge and toughness. Together these traits may be termed the in this feld. In this chapter we summarize general “lianescent vascular syndrome,” and they are common aspects of the vascular system of lianas, and provide to most scandent plants. Liana anatomy 255 Monilophyta (ferns) Pteridosperms (seed ferns) Cycadophyta Ginkgophyta Pinaceae Gnetales Cupressopsida Amborellales Nhymphaeales Laurales Magnoliales Canellales Piperales Chloranthales Monocots Ranunculales Proteales Trochodendrales Dilleniales Rosids Vitales Asterids Caryophyllales Santalales Fig. 19.1 Tracheophytes phylogeny, according to APweb (Stevens 2001 onwards, excluding lycophytes), showing examples of liana species that evolved independently in major lineages of vascular plants. Monilophyta: Blechnaceae, Salpichlaena volubilis. Pteridosperms: Medullosaceae, Medullosa steinii (fossil; dotted line). Gymnosperms: Gnetales, Gnetum sp. Angiosperms: Magnoliids, Piperales, Piperaceae, Manekia obtusa.Monocots:Arecales,Arecaceae,Calamus sp. Eudicots, Rosids, Sapindales, Sapindaceae, Serjania sp. Eudicots: Asterids, Lamiales, Bignoniaceae, Lundia longa. (Source: Illustrator L.W.Gussella. Reproduced with permission.) 256 Liana anatomy, physiology, and biomechanics THE LIANESCENT VASCULAR (Schenck 1893; Obaton 1960; Carlquist 1985a). In SYNDROME lianas with secondary growth, the combination of wide and narrow vessels or vasicentric tracheids (termed Regardless of whether the vine is a fern (e.g., Salpich- vessel dimorphism by Carlquist 1981), the presence of laena volubilis, Fig. 19.2A), gymnosperm (e.g., Gnetum non-lignifed axial and ray parenchyma, high and
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