Geophytism in monocots leads to higher rates of diversification.

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ID: 37207
2019
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Abstract
Geophytes, plants with buds on underground structures, are found throughout the plant tree of life. These below ground structures allow plants to inhabit highly seasonal and disturbance-prone environments across ecosystems. Past researchers have hypothesized the bulbous, cormous and tuberous habits promote diversification, but this had yet to be tested. Using a comprehensive monocot data set of almost 13,000 taxa, we investigated the effects of the geophytic habit on diversification using both state-dependent and state-independent models. We found that geophytes exhibit increased rates of diversification relative to non-geophytes. State-dependent analyses recovered higher yet similar rates of diversification for bulbous, cormous and tuberous taxa compared to rhizomatous and non-geophytic taxa. However, the state-independent model returned no difference in rates among the different traits. Geophytism shows higher rates of diversification relative to non-geophytes but we find little support for the hypothesis that the evolution of the bulb, corm or tuber appears to provide a diversification increase relative to rhizomatous and non-geophytic taxa. Our broad scale analysis highlights the overall evolutionary importance of the geophytic habit (i.e., belowground bud placement). However, our results also suggest that belowground morphological diversity alone cannot explain this rate increase. In order to further test the evolutionary significance of these underground structures, future studies should consider them in combination with other biotic and abiotic factors. This article is protected by copyright. All rights reserved.
Reference Key
howard2019geophytismthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Howard, Cody Coyotee;Landis, Jacob B;Beaulieu, Jeremy M;Cellinese, Nico;
Journal The New phytologist
Year 2019
DOI
10.1111/nph.16155
URL
Keywords Keywords not found

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