Smaller stomata require less severe leaf drying to close: A case study in Rosa hydrida
Gebraegziabher H. G., Kjær K. H., Fanourakis D. (2013)
Gebraegziabher Habtamu Giday, Kjær Katrine Heinsvig, Fanourakis D.,
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DEFF Research Database (Denmark) –
https://worldwidescience.org/topicpages/c/closing+plant+stomata.html
Stomata formed at high relative air humidity (RH) close less as leaf dries; an effect that varies depending on the genotype. We here quantified the contribution of each stomatal response characteristic to the higher water loss of high RH-grown plants, and assessed the relationship between response…… characteristics and intraspecific variation in stomatal size. Stomatal size (length multiplied by width), density and responsiveness to desiccation, as well as pore dimensions were analyzed in ten rose cultivars grown at moderate (60%) or high (85%) RH. Leaf morphological components and transpiration at growth…… conditions were also assessed. High growth RH resulted in thinner (11%) leaves with larger area. A strong positive genetic correlation of daytime and nighttime transpiration at either RH was observed. Stomatal size determined pore area (r = 0.7) and varied by a factor of two, as a result of proportional…
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