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Photosynthetic rate as a yield component of maize in environmental restrictive conditions

, : Photosynthetic rate as a yield component of maize in environmental restrictive conditions. Journal of Genetics & Breeding 43(1): 37-44

Rate of photosynthesis is expected to be directly related to yield potential and to be a major physiological component of yield in maize. On the contrary an absence of association between photosynthesis variability and yield component is generally demonstrated. Here the photosynthetic rate and its importance as a component of maize yield was studied in the context of an appropriate population structure (a set of random inbred lines and the derived F1 population) and of plants grown in normal and restrictive conditions. The rate of photosynthesis was estimated as CER (CO2 exchange rate). CER was shown to be an important component of the yield of inbreds under stress conditions. Hybrids are less sensitive to environmental conditions and there are no notable differences between correlation patterns under normal and stress conditions. The use of CER as a selection parameter is discussed.

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