Studies on dormancy and germination of rice seed. 8. Temperature treatment effects on rice seed dormancy and hull tissue degeneration in rice seed during the ripening period and after harvest

Hayashi, M.; Hidaka, Y., 1979: Studies on dormancy and germination of rice seed. 8. Temperature treatment effects on rice seed dormancy and hull tissue degeneration in rice seed during the ripening period and after harvest. Bulletin of the Faculty of Agriculture, Kagoshima University (29): 21-32

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Hayashi, M., 1980: Studies on dormancy and germination of rice seed. 9. Effects of oxygen and moisture on the release of rice seed dormancy and the inactivation of inhibitors in dormant seed. The effects of O2 tension seed dormancy and germination inhibitors was investigated in rice cv. Gendjah, Hadsaduri and Ketaktara. Release of dormancy was stimulated by increased O2 tension and inhibited by low O2 tension. In seeds kept at 40 deg C...

Hayashi, M., 1980: Studies on dormancy and germination of rice seed 9. the effects of oxygen and moisture upon the release of the rice seed dormancy and upon the inactivation of inhibitors in the dormant seed. The seeds of 3 foreign varieties having the different dormancy periods were stored in the laboratory, and they were tested for germination under high, medium and low O2 partial pressures with the interval of 10 days during the dormancy periods. Th...

Hayashi, M., 1977: Studies on dormancy and germination of rice seed. V. The effects of the high temperature treatment on breaking the dormancy of the high moisture seeds in rice. Nettai nogyo Japanese journal of tropical agriculture: 20 (3) 164-171

Hayashi, M., 1977: Studies on dormancy and germination of rice seed. 5. The effects of high temperature treatment on breaking the dormancy of high moisture rice seeds. When rice seed with m.c. of 25-28% were soaked in water at 25-40 deg C for 12-48 h and stored at 35, 40 or 45 deg C in water-saturated air, dormancy breaking occurred more rapidly at higher temp. and with increasing m.c. When seeds with high m.c....

Hayashi, M.; Himeno, M., 1974: Studies on the dormancy and germination of rice seed. 3. Relations between germination of immature seed and seed dormancy and growth inhibitors in rice. Endogenous growth substances from rice seeds varying from immature to mature were assayed by the Avena straight-growth test. Those from the acidic fraction of extracts from immature seeds were quantitively the same regardless of cultivar and were...

Hayashi, M.; Morifuji, N., 1972: Studies on the dormancy and germination of rice seed. 1. The influences of temperature and gaseous conditions on dormancy and germination on rice seeds. Seed dormancy was found to be higher in indica rice cv. than in japonica cv. Seed dormancy was broken by treatment at 40 deg C and with 100% O2.

Hayashi, M.; Himeno, M., 1973: Studies on the dormancy and germination of rice seed. 2. Relationship between seed dormancy and growth substances in rice. In experiments with seeds of rice cv. Hadsaduri and 4 other cv., dormant seeds contained high levels of growth inhibitors the contents of which decreased as seeds aged and dormancy eventually broke. Extracts of dormant husked seeds contained 2 gro...

Hayashi, M.; Matsuo, T., 1983: Studies on dormancy and germination of rice seed. XI. Ascertainment of the relationship between the endogenous gibberellin-like substances and the seed dormancy. Gibberellin-like substances were detected in both dormant and nondormant seeds of rice. Activity was greater in the dormant cv. Ketaktara than in the nondormant cv. Mizuho, but did not differ between dormant seeds of cv. Ketaktara and seeds with b...

Hayashi, M.; Tanaka, T., 1979: Studies on dormancy and germination of rice seed. 7. Assay of endogenous germination inhibitors by germination of excised embryos and ascertainment of the relationship between the germination inhibitors and degree of seed dormancy. A method of assaying ABA activity using non-dormant rice embryos is described. The method was used to investigate germination inhibitors in dormant rice seed. Assays confirmed that the inhibitors included ABA and an indole compound and ABA was sho...

Lin, S.S., 1976: Studies on rice seed germination and growth mechanism under low water temperature. 1. The effect of seed treatment with gibberellic acid (GA3) on the germination, growth and alpha-amylase activity of rice seed. Treatment of rice seed with GA3 for 2 days did not stimulate germination, seedling growth or seed alpha -amylase activity, but germination and alpha -amylase activity were lower in the japonica cv. Sin Chu 56 than in the indica cv. Sin Chu IGC. Lo...