Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 344337
Title Effects of long-term exposure of stomata to high relative air humidity
Author(s) Rezaei Nejad, A.; Meeteren, U. van; Harbinson, J.
Source In: Plant Biology 2005, Annual meeting American Society of Plant Biologists, Seattle, 16-20 July 2005. - Seattle, Washington : - p. 66 - 66.
Event Seattle, Washington : Annual meeting American Society of Plant Biologists, 2005-07-16/2005-07-20
Department(s) Horticultural Supply Chains
PE&RC
Publication type Abstract in scientific journal or proceedings
Publication year 2005
Abstract Plants grown at high relative air humidity (RH) show poor control of water loss after transferring to low RH. This phenomenon is thought to be due to stomatal behavior. In this study we sought to elucidate whether there are differences between the stomatal anatomy and response characteristics of well-watered Tradescantia virginiana plants grown in climate rooms at moderate (55%) and high (90%) RH. The stomatal responses to treatments expected to cause stomatal closure [i.e. desiccation, abscisic acid (ABA) application and exposure to darkness] were studied using attached or detached young, fully expanded leaves. Stomatal size and density, leaf transpiration rate, stomatal conductance and stomatal aperture were measured. Stomatal closure and heterogeneity in response to desiccation was studied using a chlorophyll fluorescence imaging system under non-photorespiratory conditions. Besides larger stomata and lower stomatal density in high RH plants, there was also a striking difference in stomatal response characteristics between moderate and high RH plants. The stomata responded to desiccation, ABA and darkness in both moderate and high RH plants but to different extents. In high RH plants, transpiration rate, stomatal conductance and aperture were higher than in moderate RH plants. Stomatal aperture distribution histograms revealed that some partially or completely non-functional stomata were present amongst normal stomata in high RH plants. During desiccation different trends of stomatal heterogeneity were found in leaves grown at moderate and high RH. Following desiccation leaves grown at high RH had both a higher heterogeneity and a higher average value of PSII efficiency compared to leaves grown at moderate RH. This confirmed non-uniform closure of stomata and the presence of some partly or completely non-functional stomata in leaves grown at high RH. These non-functional stomata were distributed mostly around the main vein
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