Effects of Timing of Drought Stress on Abscission and Dry Matter Partitioning of Short-duration Pigeonpea uri icon


  • Shoot dry weight partitioning and cumulative abscission of leaf, flowers and pods were determined for nine short-duration pigeonpea cultivars grown with adequate soil moisture throughout growth (control), or subjected to water stress during the late vegetative and flowering (stress 1), flowering and early pod development (stress 2), or pod fill (stress 3) growth stages. The total cumulative dry weight of abscised plant parts was lower for determinate cultivars, but it increased to a greater extent under water stress than that of indeterminate cultivars, with stress 2 having the greatest and stress 3 the least effects. The dry weight contribution of pods to total abscission was <5%, and not significantly affected by water stress, while the contribution of leaves increased and that of flowers decreased. Stress 3 had no significant effects on abscission dry weight totals or components. Reduction in shoot dry weight under water stress was most pronounced in the early pod development stage, and the dry weight contribution of leaves generally decreased and that of pods increased under stress 1 and stress 2. With similar abscission levels, the shoot dry weight of cv. ICPL 151, was similar to, or greater than that of hybrid ICPH 9 under stress 1 and stress 2, and the contribution of pods to shoot dry weight was lower for hybrid ICPH 9 under both stress treatments. It is suggested that cultivar differences in drought resistance were probably due to differences in the leaf area maintenance during, and in the recovery of dry weight and pod production following, water stress periods

publication date

  • 1996