Nutrient influences on leaf photosynthesis: Effects of nitrogen, phosphorus, and potassium for Gossypium hirsutum L. [Cotton]

The net rate of CO2 uptake for leaves of Gossypium hirsutum L. was reduced when the plants were grown at low concentrations of NO3 -, $\text{PO}_{4}{}^{2-}$, or K+. The water vapor conductance was relatively constant for all nutrient levels, indicating little effect on stomatal response. Although le...

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Published inPlant physiology (Bethesda) Vol. 65; no. 3; pp. 541 - 543
Main Authors Longstreth, David J., Nobel, Park S.
Format Journal Article
LanguageEnglish
Published United States American Society of Plant Physiologists 01.03.1980
Subjects
Leaves
Mesophyll
Mesophyll cells
Nitrogen
Nutritional deficiencies
Photosynthesis
Plant nutrition
Plants
Potassium
Surface areas
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Summary:The net rate of CO2 uptake for leaves of Gossypium hirsutum L. was reduced when the plants were grown at low concentrations of NO3 -, $\text{PO}_{4}{}^{2-}$, or K+. The water vapor conductance was relatively constant for all nutrient levels, indicating little effect on stomatal response. Although leaves under nutrient stress tended to be lower in chlorophyll and thinner, the ratio of mesophyll surface area to leaf area did not change appreciably. Thus, the reduction in CO2 uptake rate at low nutrient levels was due to a decrease in the CO2 conductance expressed per unit mesophyll cell wall area ($\text{g}_{\text{CO}_{2}}^{\text{cell}}$). The use of $\text{g}_{\text{CO}_{2}}^{\text{cell}}$ and nutrient levels expressed per unit of mesophyll cell wall provides a new means of assessing nutrient effects on CO2 uptake of leaves.
Bibliography:F60
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ObjectType-Article-1
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content type line 23
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.65.3.541