Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 68, Issue 9, Pages 2309-2315Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erx072
Keywords
Begonia; gas exchange; photosynthesis; stomatal closure; WUE
Categories
Funding
- M.L. MacIntyre Begonia Trust
- Biotechnology and Biological Sciences Research Council [BB/I024496/1, BB/K015893/1, BB/L001276/1, BB/M01133X/1]
- EU [NEURICE 678168]
- BBSRC [BB/H009817/1, BB/I024496/1, BB/L019205/1, BB/N006909/1, BB/M001601/1, BB/L001276/1, BB/P011586/1, BB/M01133X/1, BB/K015893/1, BB/F001673/1, BB/N01832X/1, BB/F001630/1, BB/D001528/1, BB/H024867/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/N006909/1, BB/D001528/1, BB/F001630/1, BB/N01832X/1, BB/I024496/1, BB/M001601/1, BB/C500595/1, BB/L019205/1, BB/H024867/1, BB/M01133X/1, P12750, BB/H009817/1, BB/P011586/1, BB/F001673/1, BB/L001276/1, BB/K015893/1] Funding Source: researchfish
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Stomata are microscopic pores formed by specialized cells in the leaf epidermis and permit gaseous exchange between the interior of the leaf and the atmosphere. Stomata in most plants are separated by at least one epidermal pavement cell and, individually, overlay a single substomatal cavity within the leaf. This spacing is thought to enhance stomatal function. Yet, there are several genera naturally exhibiting stomata in clusters and therefore deviating from the one-cell spacing rule with multiple stomata overlaying a single substomatal cavity. We made use of two Begonia species to investigate whether clustering of stomata alters guard cell dynamics and gas exchange under different light and dark treatments. Begonia plebeja, which forms stomatal clusters, exhibited enhanced kinetics of stomatal conductance and CO2 assimilation upon light stimuli that in turn were translated into greater water use efficiency. Our findings emphasize the importance of spacing in stomatal clusters for gaseous exchange and plant performance under environmentally limited conditions.
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