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Kiel, Carrie [1], Tripp, Erin [2], Fisher, Amanda [3], McDade, Lucinda [4].

The surprising morphological and interspecific variation among stigmas in New World Justicia: Is this remarkable diversity associated with pollination syndromes?

The genus Justicia (Acanthaceae), with ca. 400 spp. in the western hemisphere, encompasses incredible floral morphological diversity. Along with a rich diversity of corolla color, form and size, this group encompasses fascinating micromorphological variation of the anthers, pollen, and stigmas: all critical features for the plant : pollinator interface. For example pollen aperture number ranges from two to at least eight, and exine sculpturing is highly variable. Anther thecae may be parallel to widely divergent, and are often long appendaged. We have previously shown that, among these plants, micro-structures of anthers and pollen are correlated with corolla form in a pattern that is consistent with particular pollination syndromes: hummingbird, Lepidopteran, and bee/fly. Here we report the first results from an investigation of stigma shape and micromorphology in two major clades of the New World Justicioid lineage. We take an integrative and comparative approach to test the hypothesis that variation of the stigmas is linked to pollination syndromes. We also test the hypothesis that anther, pollen, and stigma function together in an integrated manner as suites and we test for patterns of convergence of these traits in both lineages. Results from this study will set the stage for a broad-scale examination of these traits across the entire New World Justicioid lineage.

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1 - California Botanic Garden, 1500 North College Ave, Claremont, CA, 9711, USA
2 - University Of Colorado, Boulder, EBIO & Museum Of Natural History, Boulder, CO, 80309.0, United States
3 - California State University, Long Beach, Biological Sciences, Mail Stop 9502, 1250 Bellflower Blvd, Long Beach, CA, 90840, United States
4 - California Botanic Garden, California Botanic Garden, 1500 N College Ave, CLAREMONT, CA, 91711, United States

Morphological variation
plant-pollinator interactions

Presentation Type: Oral Paper
Session: MACROIII, Macroevolution III
Location: Virtual/Virtual
Date: Friday, July 23rd, 2021
Time: 11:15 AM(EDT)
Number: MACROIII006
Abstract ID:901
Candidate for Awards:None

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