Document Detail

Distinct light responses of the adaxial and abaxial stomata in intact leaves of Helianthus annuus L.
MedLine Citation:
PMID:  18537998     Owner:  NLM     Status:  MEDLINE    
Using a laboratory-constructed system that can measure the gas exchange rates of two leaf surfaces separately, the light responses of the adaxial and abaxial stomata in intact leaves of sunflower (Helianthus annuus L.) were investigated, keeping the intercellular CO(2) concentration (C(i)) at 300 microL L(-1). When evenly illuminating both sides of the leaf, the stomatal conductance (g(s)) of the abaxial surface was higher than that of the adaxial surface at any light intensity. When each surface of the leaf was illuminated separately, both the adaxial and abaxial stomata were more sensitive to the light transmitted through the leaf (self-transmitted light) than to direct illumination. Relationships between the whole leaf photosynthetic rate (A(n)) and the g(s) for each side highlighted a strong dependence of stomatal opening on mesophyll photosynthesis. Light transmitted through another leaf was more effective than the direct white light for the abaxial stomata, but not for the adaxial stomata. Moreover, green monochromatic light induced an opening of the abaxial stomata, but not of the adaxial stomata. As the proportion of blue light in the transmitted light is less than that in the white light, there may be some uncharacterized light responses, which are responsible for the opening of the abaxial stomata by the transmitted, green light.
Yin Wang; Ko Noguchi; Ichiro Terashima
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-06-05
Journal Detail:
Title:  Plant, cell & environment     Volume:  31     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-10     Completed Date:  2008-11-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1307-16     Citation Subset:  IM    
Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan.
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MeSH Terms
Carbon Dioxide / metabolism
Helianthus / physiology*,  radiation effects
Photosynthesis / physiology,  radiation effects
Plant Leaves / physiology*,  radiation effects
Plant Stomata / physiology*,  radiation effects
Reg. No./Substance:
124-38-9/Carbon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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