Document Detail

Lateral CO2 diffusion inside dicotyledonous leaves can be substantial: quantification in different light intensities.
MedLine Citation:
PMID:  17905868     Owner:  NLM     Status:  MEDLINE    
Substantial lateral CO(2) diffusion rates into leaf areas where stomata were blocked by grease patches were quantified by gas exchange and chlorophyll a fluorescence imaging in different species across the full range of photosynthetic photon flux densities (PPFD). The lateral CO(2) flux rate over short distances was substantial and very similar in five dicotyledonous species with different vascular anatomies (two species with bundle sheath extensions, sunflower [Helianthus annuus] and dwarf bean [Phaseolus vulgaris]; and three species without bundle sheath extensions, faba bean [Vicia faba], petunia [Petunia hybrida], and tobacco [Nicotiana tabacum]). Only in the monocot maize (Zea mays) was there little or no evident lateral CO(2) flux. Lateral diffusion rates were low when PPFD <300 micromol m(-2) s(-1) but approached saturation in moderate PPFD (300 micromol m(-2) s(-1)) when lateral CO(2) diffusion represented 15% to 24% of the normal CO(2) assimilation rate. Smaller patches and higher ambient CO(2) concentration increased lateral CO(2) diffusion rates. Calculations with a two-dimensional diffusion model supported these observations that lateral CO(2) diffusion over short distances inside dicotyledonous leaves can be important to photosynthesis. The results emphasize that supply of CO(2) from nearby stomata usually dominates assimilation, but that lateral supply over distances up to approximately 1 mm can be important if stomata are blocked, particularly when assimilation rate is low.
James I L Morison; Tracy Lawson; Gabriel Cornic
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-09-28
Journal Detail:
Title:  Plant physiology     Volume:  145     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-11-06     Completed Date:  2008-01-14     Revised Date:  2013-06-06    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  680-90     Citation Subset:  IM    
Department of Biological Sciences, University of Essex, Colchester, United Kingdom.
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MeSH Terms
Carbon Dioxide / metabolism*
Dose-Response Relationship, Radiation
Helianthus / metabolism
Models, Biological
Petunia / metabolism
Phaseolus / metabolism
Plant Leaves / metabolism*,  radiation effects*
Plant Transpiration
Tobacco / metabolism*,  radiation effects
Vicia faba / metabolism
Zea mays / metabolism
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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