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Pakistan Journal of Biological Sciences
Year: 1999  |  Volume: 2  |  Issue: 4  |  Page No.: 1286 - 1291

Response of Wheat to Combined High Temperature and Osmotic Stresses During Maturation. 1: Plant Photosynthesis and Productivity

Nazeer Hussain Shah and G.M. Paulsen    

Abstract: The decline in photosynthesis and rise in stomas resistance during maturation were slowed by low temperature and speeded by high temperature and damage from osmotic stress increased substantially with rise in temperature. Viable leaf area persisted longer and was diminished less by osmotic stress under low temperature than under high temperature. Vegetative and grain masses at maturity were increased by low temperature and were reduced most by osmotic stress with high temperature. The results demonstrate that high temperature and osmotic stress reduce photosynthesis and productivity and interact synergistically to accentuate injury. Wheat can tolerate considerable osmotic stress if the temperature is favorable because of a direct effect that maintains photosynthesis and an indirect effect that minimizes injury from osmotic stress.

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