31/03/13
Abstract Submission/Modification Form
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You have submitted the following abstract to New Frontiers in Tropical Biology: The Next 50 Years (A Joint Meeting of ATBC and OTS). Receipt of this notice does not guarantee that your submission was complete, free of errors, or accepted for presentation. Why do plants present heterophylly?, the case of the leaf functional traits of Costus pulverulentus (Costaceae) J. Antonio Guzmán Q., Programa Regional de Posgrado en Biología, Sistema de Estudios de Posgrado, Universidad de Costa Rica, Costa Rica Abstract Text: Heretophylly is the production of leaves of different size or shape along the longitudinal axis, whose variation may be under genetic control or the phenotypic plasticity in response to environmental conditions. I used different methodological approaches to study the function of heterophylly along the main axis of Costus pulverulestus and its possible adaptive value: a Procrustes leaf morphology analysis and detailed characterizations of leaf area, specific leaf area and leaf divergence angles along the crown to show the presence of heterophylly, and a three-dimensional simulation analysis for light capture efficiency (LCE) assuming plants with only leaf morphologies using two leaf forms (top and basal leaf forms) to study its adaptive value. The Procrustes leaf analysis showed that plants develop two contrasting leaf morphologies: 1) basal leaves possessing an obovate shape and a round apex, and 2) top leaves with an oblanceolate shape and a caudate apex. Mid-crown leaves showed a reduced specific leaf area and angles of divergence, and an increased leaf area, which may indicate greater space utilization for resource acquisition. The three-dimensional simulations assuming plants with only top-leaf morphologies resulted on plants with greater LCE than simulated plants with only basal leaf forms, due to lower self-shading effects produced by top-leaf arrangements. Why do plants develop a basal leaf morphology if this influences lower LCE?. When leaves of the same leaf length are compared, leaves with basal-leaf form have a greater leaf area than top-leaf forms. This result in more leaf area might be the responsible for the production of basal leaf morphologies in early plant development, because this advantage derives into greater resource acquisition. The case of C. pulverulentus shows that the production of alternative leaf shapes is an adaptation to minimize self-shading, which consequently may lead to an increased light capture and carbon gain.
Topic Selection: Organismal Biology - Plants
Submitter's E-mail Address:
[email protected] Preferred Presentation Format: Oral First Presenting Author Presenting Author J. Antonio Guzmán Q. Programa Regional de Posgrado en Biología, Sistema de Estudios de Posgrado, Universidad de Costa Rica Costa Rica Email:
[email protected] -- Will not be published
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31/03/13
Abstract Submission/Modification Form
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