Abstract
THE effect of high temperature on the acceleration of flowering in a number of varieties of rice has been reported previously1,2,3,4. In addition to early flowering, pre-sowing high-temperature treatment results in better resistance to drought conditions5. Vernalization by high temperature has practical difficulties. Radicles and plumules emerge from the seed coat during treatment, involving difficulty of transportation. This has been overcome in two varieties of rice noted below by limiting the moisture content of seeds to 30 per cent of fresh weight. Seeds at this moisture content germinated without the radicles and plumules penetrating the seed coat, and gave vernalization response when exposed to high temperature, 35° C., for 10 and 20 days (table).
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