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Articles by Nazeer Hussain Shah
Total Records ( 2 ) for Nazeer Hussain Shah
  Nazeer Hussain Shah and Gary M. Paulsen
  High temperature and drought affect plant processes individually and may interact to alter water relations. Our objectives were to ascertain the effect of high temperature and osmotic stress and to identity interactions between them on water relation of wheat (Triticum aestivum L. cv. Len). Plants that were grown uniformly until anthesis were subjected to 15/10, 25/20 or 35/30°C and -0.01 or 0.41 Mpa water stress and were sampled weekly until maturity. Relative water content (RWC) of flag leaves remained constant at low temperature and declined quickly at high temperature. Osmotic stress decreased RWC slowly at low temperature and rapidly at high temperature as plants matured. Water potential and osmotic potential reacted similarly, staying high at low temperature and falling faster as the temperature increased or osmotic stress impinged. Turgor potential was sometimes higher under 15/10°C with osmotic stress than under other regimes, but varied lesser than other pressure components. Cumulative water use ranked 25/20 >15/10 >35/30°C without osmotic stress >15/10°C = 25/20°C = 35/30°C with osmotic stress. Water use efficiency for grain mass was reduced by high temperature and increased by osmotic stress. Results demonstrated that high temperature and osmotic stress interact by complementary effect on water relations and beneficial effects of low temperature on osmotic adjustment to stress.
  Nazeer Hussain Shah and G.M. Paulsen
  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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