Cytogeographic, morphological, and genetic variation of the cactus Cylindropuntia leptocaulis

Polyploidy (i.e., whole genome duplication), hybridization, and reticulate evolution have long been recognized as key mechanisms of speciation in the plant family Cactaceae. Polyploidy can result in reproductive isolation, changes in genetic diversity, breeding system discrepancies and gene regulation effects, which consequently can lead to shifts in morphology, physiology, and ecological breadth. Cylindropuntia leptocaulis is the most widespread cholla in North America and comprises three known ploidal levels with varying distributions. The implications of multiple cytotypes in C. leptocaulis on taxonomy, morphology, population genetics, and environmental breadth remain poorly understood. By using an interdisciplinary approach to study polyploidy and its subsequent effects on shaping diversity, this framework has the potential for broader application to other arid-adapted species.
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presented by Bethany Zumwalde, University of Florida
Torrey Botanical Society Fall 2022 Lecture Series
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00:00 Introduction
02:42 Lecture
52:26 Q&A
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