Agronomic, biochemical and physiological responses of some spring wheat (Triticum aestivum L. Em Thell) cultivars to drought stress at reproductive stage
1985
Ghartie-Chhetri, G.B.
Highly significant variety x stress duration interaction effect was observed on stomatal resistance (R2), LWP (leaf water potential), NRA (nitrate reductase activity), grain weight, harvest index (HI), SMC (soil moisture content) but it was not significant in number of grains/spike. NL 370, N496,, NL292 and Siddhartha exhibited drought avoidance by maintaining relatively higher LWP under water stress. Rs increased more on the lower than in the upper leaf surface under drought stress. Lerma 52, Triveni and Trigo 1 had sharp rise in their Rs even at mild stress in contrast to other varieties which had gradual increase in Rs as the drought progressed. NRA decreased with increase in drought duration. Leaf proline and grain protein content increased as the drought progessed. Leaf proline had significant correlation with LWP (r=-0.80* ), SMC (r=-0.48* ) and Rs (r=0.56* ). Grain protein had strong correlation with SMC, LWP, grain filling duration and 100-grain weight. NL496, NL370, NL292 and Trigo 2 had the higher SMC under different drought duration. Drought enhanced maturity and grain filling duration
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