Anisohydric sugar beet rapidly responds to light to optimize leaf water use efficiency utilizing numerous small stomata.
作者： Georgina E Barratt , Debbie L Sparkes , Lorna McAusland , Erik H Murchie
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摘要: © 2020 The Author(s) 2020. Published by Oxford University Press on behalf of the Annals Botany Company. Under conditions high transpiration and low soil water availability, demand for can exceed supply causing a reduction in potential loss cell turgor (wilting). Regulation stomatal aperture mediates vapour (gs), which turn is dependent part anatomical characteristics density (SD) size (SS). Anisohydric sugar beet (Beta vulgaris) atypical, exhibiting wilting under availability. Spinach (Spinacia oleracea) belongs to same family Chenopodiaceae s.s., but demonstrates more typical response. To investigate role dynamics such behaviours, spinach leaves were exposed step-changes photosynthetic photon flux (PPFD) from 250 2500 μmol m-2 s-1. Using four log-logistic function, maximum rate opening was estimated. Concurrent measurements SD SS taken both species. While coupled faster with smaller, numerous stomata, showed converse. After exposure drought, gs reduced still achieved similar speed opening. It concluded that stomata respond rapidly changes PPFD magnitude non-droughted droughted conditions. Such response may contribute wilting, even enables photosynthesis be better increasing PPFD.
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