The germination of pearl millet (Pennisetum typhoides S. & H.) seeds was investigated at constant temperatures between 12 �C and 47 �C on a thermal gradient plate. The rate of germination increased linearly with temperature from a base <it>T</it><inf>b</inf> to a sharply defined optimum <it>T</it><inf>o</inf> beyond which the rate decreased linearly with temperature, reaching zero at <it>T</it><inf>m</inf>. The linearity of the response both above and below <it>T</it><inf>o</inf> allowed time and temperature to be combined in a thermal time at which a specified fraction of the seeds germinated. Within the population <it>T</it><inf>b</inf> and <it>T</it><inf>m</inf> were constant.
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García-Huidobro et al. (1982) studied this question.
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