Genotypic Differences in the Temperature Responses of Tropical Crops

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Abstract
Mohamed, H. A., Clark, J. A. and Ong, C. K. 1988. Genotypic differences in the temperature responses of tropical crops. I. Germination characteristics of groundnut (Arachis hypogaea L.) and pearl millet (Pennisetum typhoides S. & H.).—J. exp. Bot. 39: 1121–1128. The germination at constant temperature of several genotypes of groundnut and pearl millet was investigated between 0°C and 50°C on a thermal gradient plate. Large differences in both germination rate and percentage germination were observed in both species. Base temperatures vary from 8–11.5°C and 8–13.5°C in groundnut and millet, respectively and optimum temperatures from about 29–36.5°C in both. Maximum temperatures for germination ranged from 41–47°C. The results are discussed in terms of adaptation to high soil temperature and crop establishment in the semi-arid tropics.

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