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JXB Advance Access published online on September 18, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl114
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received March 6, 2006
Accepted July 6, 2006

RESEARCH PAPER

Dynamics of spatial heterogeneity of stomatal closure in Tradescantia virginiana altered by growth at high relative air humidity

Abdolhossein Rezaei Nejad 1 *, Jeremy Harbinson 2, and Uulke van Meeteren 2

1 Horticultural Production Chains Group, Plant Sciences, Wageningen University, Marijkeweg 22, 6709 PG, Wageningen, The Netherlands; Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, PO Box 465, Korramabad, Iran
2 Horticultural Production Chains Group, Plant Sciences, Wageningen University, Marijkeweg 22, 6709 PG, Wageningen, The Netherlands

* To whom correspondence should be addressed.
Abdolhossein Rezaei Nejad, E-mail: Hossein.Rezaeinejad{at}wur.nl


  Abstract

The spatial heterogeneity of stomatal closure in response to rapid desiccation of excised well-watered Tradescantia virginiana leaves grown at moderate (55%) or high (90%) relative air humidity (RH) was studied using a chlorophyll fluorescence imaging system under non-photorespiratory conditions. Following rapid desiccation, excised leaves grown at high RH had both a greater heterogeneity and a higher average value of PSII efficiency ({Phi}PSII) compared with leaves grown at moderate RH. Larger decreases in relative water content resulted in smaller decreases in water potential and {Phi}PSII of high RH-grown leaves compared with moderate RH-grown leaves. Moreover, the {Phi}PSII of excised high RH-grown leaves decreased less with decreasing water potential, implying that the stomata of high RH-grown leaves are less sensitive to decreases in leaf water potential compared with moderate RH-grown leaves. After desiccation, some non-closing stomata were distributed around the main vein in high RH-grown leaves. Direct measurements of stomatal aperture showed 77% stomatal closure in the margins after 2 h desiccation compared with 40% closure of stomata in the main-vein areas in high RH-grown leaves. Faster closure of stomata in leaf margins compared with main-vein areas of leaves grown at high RH was related to substantially lower relative water content in these areas of the leaves.

Keywords: Desiccation; patchiness; PSII efficiency; relative water content; stomata; water potential.
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