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Photosynthetic efficiency of wheat under water stress conditions


, : Photosynthetic efficiency of wheat under water stress conditions. Pakistan Journal of Scientific & Industrial Research 41(3): 156-163, June

An experiment was conducted in cemented tanks with four wheat genotypes: two were tolerant (Chakwal-86 and AZS-4) and two susceptible (Pavon and AZS-17) to water stress. The parameters estimated were the photosynthetic efficiency and nitrogen metabolism of the gentoypes. Measurements were made of accumulation of dry matter, transpiration, leaf diffusive resistance, leaf area, nitrate reductase activity (NRA) and total amino acids. Results showed that leaf area, transpiration, dry matter accumulation and NRA were reduced while leaf diffusive resistance and total amino acids increased in all the genotypes under all stress treatments. The relationship between yield and leaf area, transpiration, dry matter accumulation and NRA was positive. The genotypes Chakwal-86 and AZS-4 showed better performance than the others.

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