EVALUATION OF C 3 PHOTOSYNTHETIC REFICIENCY IN WINTER WHEAT

Five winter wheat cultivars grown in the field were evaluated for photosynthetic activity, using infrared gas analysis. Photosynthetic efficiency as defined by the ration of fixed CO2 contained in the grain to carbon dioxide exchange rate (CER) per unit land area was determined. Mean CER per unit le...

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Bibliographic Details
Published in:Cereal research communications 1986-01, Vol.14 (1), p.11-17
Main Authors: Bruns, H.A., Croy, L.I.
Format: Article
Language:English
Subjects:
Agricultural land
Carbon dioxide
Crop production
Exchange rates
Grains
Leaf area
Leaf area index
Photosynthesis
Soybeans
Wheat
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Summary:Five winter wheat cultivars grown in the field were evaluated for photosynthetic activity, using infrared gas analysis. Photosynthetic efficiency as defined by the ration of fixed CO2 contained in the grain to carbon dioxide exchange rate (CER) per unit land area was determined. Mean CER per unit leaf area failed to be significantly different among cultivars. Thus, no relationship to grain yield could be established. Calculations of CER per unit land area did provide significant differences among cultivars but no relationship to yield was observed. Photosynthetic efficiency (grain CO2/CER (kgCO2 ha−hr−) differed significantly among cultivars. High grain yield was not necessarily associated with high CER per unit land area. Further study into source-sink relationships of wheat is needed before improvements in grain yield through increased photosynthesis can be made.
ISSN:0133-3720
1788-9170