?PHOTOSYNTHETIC EFFICIENCY OF WHEAT UNDER WATER STRESS CONDITIONS
Keywords:
Wheat, Photosynthetic efficiency, Water stress.Abstract
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 andnitrogenmetabolismofthegentoypes. Measurementsweremadeofaccumulation ofdrymatter,transpi-
ration, leafdiffusive resistance, leaf area,nitratereductase activity (NRA) and total amino acids. Results showed that
leafarea,transpiration, drymatteraccumulationandNRAwerereducedwhiIeleafdiffusive resistanceandtotalamino
acids increased in all the genotypes under all stress treatments. The relationship between yield and leaf area,
transpiration, dry matter accumulation andNRA waspositive. The genotypes Chakwal-86 and AZS-4 showed betier
performance than theothers.