Response of cowpea genotypes [Vigna unguiculata (L.) Walp.] to artificial pollination in the tropics
1997
Umaharan, P. | Ariyanayagam, R.P. | Haque, S.Q. (West Indies Univ., St. Augustine (Trinidad and Tobago). Department of Life Sciences)
Three experiments were conducted to understand the factors that determine podset in cowpea [Vigna unguiculata (L.) Walp.)] with artificial pollination in the tropics. Eight genotypes grown in open conditions, were crossed in all possible combinations using two methods of pollination (conventional and rapid). The percentage podset success obtained varied from 10 to 65, depending of the female parent and the crossing method. The conventional method was superior to the rapid method in female parents that gave a low success percentage, but was similar to the rapid method in female parents that gave higher podsets. Differences among female parents seemed to be related to floral morphology. In a subsequent study, evening pollination that ensured a cooler post-pollination environment was shown to improve podsets in all the genotypes tested, but genotypic differences were still evident. The differences between the rapid method and the conventional method were not evident in the third experiment, when genotypes were grown under 'optimized' conditions as determined in the second experiment. Podsets as high as 90 percent can be obtained provided the pollination conditions are standardized to suit the female parent involved and by appropriate choice of female parent.
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