Making pore choices: repeated regime shifts in stomatal ratio

Proceedings. Biological Sciences
Christopher D Muir

Abstract

Ecologically important traits do not evolve without limits. Instead, evolution is constrained by the set of available and viable phenotypes. In particular, natural selection may only favour a narrow range of adaptive optima constrained within selective regimes. Here, I integrate data with theory to test whether selection explains phenotypic constraint. A global database of 599 plant species from 94 families shows that stomatal ratio, a trait affecting photosynthesis and defence against pathogens, is highly constrained. Most plants have their stomata on the lower leaf surface (hypostomy), but species with half their stomata on each surface (amphistomy) form a distinct mode in the trait distribution. A model based on a trade-off between maximizing photosynthesis and a fitness cost of upper stomata predicts a limited number of adaptive solutions, leading to a multimodal trait distribution. Phylogenetic comparisons show that amphistomy is the most common among fast-growing species, supporting the view that CO2 diffusion is under strong selection. These results indicate that selective optima stay within a relatively stable set of selective regimes over macroevolutionary time.

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Citations

Apr 8, 2017·Tree Physiology·Alana R O Chin, Stephen C Sillett
Dec 21, 2018·The New Phytologist·Paul L DrakeErik J Veneklaas
May 30, 2019·Integrative and Comparative Biology·Christopher D Muir
Oct 5, 2019·The Plant Journal : for Cell and Molecular Biology·Emily L HarrisonChristopher Hepworth
Jan 22, 2020·The Plant Journal : for Cell and Molecular Biology·Asaph B CousinsBalasaheb V Sonawane
Jan 28, 2020·The New Phytologist·Katelyn H McKown, Dominique C Bergmann
Jan 24, 2020·Journal of Experimental Botany·Freya RichardsonTimothy J Brodribb
Apr 8, 2020·Oecologia·Heather A HagerJonathan A Newman
Jul 12, 2020·The New Phytologist·Dongliang Xiong, Jaume Flexas
Jun 11, 2019·Frontiers in Plant Science·Oren ShelefShimon Rachmilevitch
Sep 22, 2017·Frontiers in Plant Science·Le LiDali Guo
Nov 17, 2020·Frontiers in Plant Science·Christopher D Muir
May 18, 2021·Frontiers in Plant Science·Congcong LiuNianpeng He
Jun 3, 2021·Proceedings. Biological Sciences·Barbara M Neto-BradleyMatthew W Pennell
Jul 26, 2021·Trends in Plant Science·João Antonio SiqueiraWagner L Araújo
Jun 3, 2021·Evolution; International Journal of Organic Evolution·Jill T AndersonMonica A Geber

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