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Hernandez-Hernadez, Brenda [1], Rosas, Miguel [2], Piña De la Rosa, Itzel Aurora [3], Cacho, N. Ivalu [1].

Understanding foliar diversity and its evolution using Ipomoea (Convolvulaceae) as a model.

Leaves are essential for plants and ecosystems since they play fundamental roles in crucial ecological processes, such as photosynthesis and carbon fixation and sequestration. Despite, and possibly because, of their great relevance, leaves come in a wide variety of sizes and shapes. While important progress in our understanding of leaf traits such as size, shape, venation and indumentum has been made, we are still far from identifying the drivers (historical or ecological) of leaf shape evolution both within and across groups of plants.Here we take advantage of the great leaf diversity in Ipomoea L. (Convolvulaceae) to study leaf shape evolution, and add this group as a model to study foliar diversity. To analyze the evolution of leaf shape, we first built a database of leaf traits that includes both categorical (e.g., leaf, base, apex and margin) and continuous leaf traits (area, perimeter) for 279 species of the New World (NW) clade of Ipomoea for which a phylogenetic hypothesis exists. Our preliminary analyses suggest that in NW Ipomoea, the ancestral leaf was most likely ovate with a cordate base, acuminate apex and entire margin. Most of the leaf traits we have analyzed exhibit low phylogenetic signal, suggesting that leaf shape evolution is rather labile, and likely related to ecological rather than phylogenetic factors.

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1 - National Autonomous University of Mexico (UNAM), Botany, 3er Circuito de Ciudad Universitaria Del. Coyoacán., Mexico City, Mexico City, 04510
2 - Autonomous Metropolitan University-Xochimilco., Man and his Environment, Calz. del Hueso 1100, Coapa, Villa Quietud, Coyoacán., Mexico City, Mexico City, 04960
3 - Instituto de Biologia, UNAM, Botanica, 3er circuito de Ciudad Universitaria s/n, Del Coyoacan, Mexico, CDMX, 04510, Mexico

Leaf evolution
ancestral states  reconstruction.

Presentation Type: Poster
Session: P3, Systematics Posters
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 5:00 PM(EDT)
Number: P3SY003
Abstract ID:319
Candidate for Awards:None

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