In three cultivars of japonica paddy rice, mesocotyl length of seedlings grown in the dark from grains obtained 10 and 20 days after anthesis was greater than 10 mm, while mesocotyl length decreased with the maturity of the grain and it was less than 10 mm in grain obtained 40 days after anthesis. Abscisic acid (ABA) stimulated the elongation of mesocotyl to more than 10 mm in a cultivar of japonica paddy rice in the dark, though it inhibited the elongation of coleoptile. It seems that morphological characters of these seedlings were similar to those of the seedlings grown from immature grains. From the above results, it is suggested that ABA-like substances were contained in the mesocotyl of the paddy rice seedlings grown from immature grains.
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