Reproductive Responses of Cowpea to Heat Stress: Genotypic Differences in Tolerance to Heat at Flowering

Warrag, M.O.A. and Hallauer, A.E. (1983) Reproductive Responses of Cowpea to Heat Stress: Genotypic Differences in Tolerance to Heat at Flowering. Crop Science, 23 (6). pp. 1088-1092.

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The effect of high temperature on ability of cowpea [Vigna unguiculata (L.) Walp.] to set pods was investigated under field conditions and in controlled environments. During hot weather in the Imperial Valley, Calif., the cowpea strains TVu 4552, PI 204647, and ‘Prima’ produced substantial numbers of pods, while 55 other strains produced no or few pods, even though they produced numerous open flowers. Studies in growth chambers demonstrated that TVu 4552 has greater tolerance to high night and high day temperatures at flowering than the California cultivar, ‘California Blackeye No. 5’ (CBS), whereas Prima is intermediate. Susceptibility to high temperatures was associated with low pollen viability and indehischent anthers for CB5 and with anther indehiscence for Prima. Artificial pollination demonstrated that pistil viability of all three genotypes was not significantly affected by high temperature. Thus, the flower abscission observed with CB5 and Prima at high temperatures was mainly caused by male sterility. In addition, substantial levels of embryo abortion were observed with CB5 and Prima at high day temperatures. Apparently, Imperial Valley provides a suitable field environment during the summer for screening cowpeas for heat tolerance. This environment is presently being used to screen the segregating populations from crosses designed to incorporate the heat tolerance of TVu 4552 and Prima into genetic backgrounds suitable for the tropics and subtropics

Item Type: Article
Uncontrolled Keywords: Adaptation to High Temperature, Flower Abscission, Pod Set, Anther lndehiscence, Pollen Viability, Vigna unguiculata (L.) Walp
Author Affiliation: Dep. of Botany and Plant Sciences, Univ. of California, Riverside, CA 92521
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Ms K Syamalamba
Date Deposited: 17 Nov 2011 05:58
Last Modified: 17 Nov 2011 05:58
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