Diversity in stomatal and hydraulic responses to post-flowering drought in common (Phaseolus vulgaris) and tepary (P. acutifolius) beans.

Autor: Buckley TN; Department of Plant Sciences, University of California, Davis, California, USA., Magney TS; Department of Plant Sciences, University of California, Davis, California, USA., Berny Mier Y Teran JC; Department of Plant Sciences, University of California, Davis, California, USA., Mills C; Department of Plant Sciences, University of California, Davis, California, USA., Palkovic A; Department of Plant Sciences, University of California, Davis, California, USA., Parker TA; Department of Plant Sciences, University of California, Davis, California, USA., Pierce MA; Department of Agriculture, Plant Science Faculty, Ventura College, Ventura, California, USA., Wadhwani Y; Department of Plant Sciences, University of California, Davis, California, USA., Wong CYS; Department of Plant Sciences, University of California, Davis, California, USA.; Faculty of Forestry and Environmental Management, University of New Brunswick, Fredericton, New Brunswick, Canada., Gepts P; Department of Plant Sciences, University of California, Davis, California, USA., Gilbert ME; Department of Plant Sciences, University of California, Davis, California, USA.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2024 Sep 04. Date of Electronic Publication: 2024 Sep 04.
DOI: 10.1111/pce.15106
Abstrakt: Plants differ widely in how soil drying affects stomatal conductance (g s ) and leaf water potential (ψ leaf ), and in the underlying physiological controls. Efforts to breed crops for drought resilience would benefit from a better understanding of these mechanisms and their diversity. We grew 12 diverse genotypes of common bean (Phaseolus vulgaris L.) and four of tepary bean (P. acutifolius; a highly drought resilient species) in the field under irrigation and post-flowering drought, and quantified responses of g s and ψ leaf , and their controls (soil water potential [ψ soil ], evaporative demand [Δw] and plant hydraulic conductance [K]). We hypothesised that (i) common beans would be more "isohydric" (i.e., exhibit strong stomatal closure in drought, minimising ψ leaf decline) than tepary beans, and that genotypes with larger ψ leaf decline (more "anisohydric") would exhibit (ii) smaller increases in Δw, due to less suppression of evaporative cooling by stomatal closure and hence less canopy warming, but (iii) larger K declines due to ψ leaf decline. Contrary to our hypotheses, we found that half of the common bean genotypes were similarly anisohydric to most tepary beans; canopy temperature was cooler in isohydric genotypes leading to smaller increases in Δw in drought; and that stomatal closure and K decline were similar in isohydric and anisohydric genotypes. g s and ψ leaf were virtually insensitive to drought in one tepary genotype (G40068). Our results highlight the potential importance of non-stomatal mechanisms for leaf cooling, and the variability in drought resilience traits among closely related crop legumes.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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