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Abstract Detail


Kiel, Carrie A. [1], McDade, Lucinda [2].

The evolution of androecial, pollen and stigma morphology in New World Justicia.

The monophyletic New World ‘justicioid’ lineage includes all members of Justicia (ca. 500 spp.) and five smaller New World genera: Cephalacanthus (1 sp.), Poikilacanthus (14 spp.), Megaskepasma (1 sp.), Clistax (3 spp.), and Harpochilus (2 spp.). Floral morphological diversity is extremely remarkable among NW justicioids. In particular, the anthers demonstrate high variability: the two stamens may have thecae that are parallel, equal and unappendaged or that have expanded connective tissue and are unequal and/or displaced, and appendaged in various ways. Our phylogenetic results strongly suggest that this morphological disparity is correlated with pollination syndromes. NW Justicia with hummingbird-pollinated flowers or floral morphology consistent with hummingbird pollination often have thecae that are parallel or nearly so whereas Justicia from the OW, where hummingbirds do not occur, lack this arrangement. Insect pollinated Justicia tend to have highly modified anthers with expanded connective tissue, often with spur-like structures and varying degrees of super-positioning of the thecae. Morphometric analyses of androcial traits support this hypothesis. We also examine correlations between these anther traits and linked micromorphological characters important in pollination such as pollen and stigma lobe variability.Finally, we present preliminary results from Hyb-Seq data represented by species pairs with different pollination systems and different anther morphologies.

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1 - Rancho Santa Ana Botanic Garden, 1500 North College Ave., Claremont, CA, 91711, USA
2 - Rancho Santa Ana Botanic Garden, Botany, 1500 North College Ave, Claremont, CA, 91711, United States


Presentation Type: Oral Paper
Session: 17, Asterids I part B
Location: 204/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 10:30 AM
Number: 17010
Abstract ID:892
Candidate for Awards:None

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