Photosynthetic rate control in cotton: Stomatal and nonstomatal factors [Gossypium hirsutum]

The relationship between single leaf photosynthesis and conductance was examined in cotton (Gossypium hirsutum L.) across a range of environmental conditions. The purpose of this research was to separate and define the degree of stomatal and nonstomatal limitations in the photosynthetic process of f...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1983-11, Vol.73 (3), p.658-661
Main Authors: HUTMACHER, R. B, KRIEG, D. R
Format: Article
Language:English
Subjects:
Arid zones
Biological and medical sciences
Carbon dioxide
Cotton
Dehydration
Environmental disorders
Fundamental and applied biological sciences. Psychology
Leaf conductance
Leaves
Metabolism
Metabolism. Physicochemical requirements
Photosynthesis
Photosynthesis, respiration. Anabolism, catabolism
Plant physiology and development
Plants
Stomatal conductance
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Summary:The relationship between single leaf photosynthesis and conductance was examined in cotton (Gossypium hirsutum L.) across a range of environmental conditions. The purpose of this research was to separate and define the degree of stomatal and nonstomatal limitations in the photosynthetic process of field-grown cotton. Photosynthetic rates were related to leaf conductance of upper canopy leaves in a curvilinear manner. Increases in leaf conductance of CO2 in excess of 0.3 to 0.4 mole per square meter per second did not result in significant increases in gross or net photosynthetic rates. No tight coupling between environmental influences on photosynthetic rates and those affecting conductance levels was evident, since photosynthesis per unit leaf conductance did not remain constant. Slowly developing water stress caused greater reductions in photosynthesis than in leaf conductance, indicating nonstomatal limitations of photosynthesis. Increases in external CO2 concentration to levels above ambient did not produce proportional increases in photosynthesis even though substomatal or intercellular CO2 concentration increased. The lack of a linear increase in photosynthetic rate in response to increases in leaf conductance and in response to increases in external CO2 concentration demonstrated that nonstomatal factors are major photosynthetic rate determinants of cotton under field conditions.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.73.3.658