Seed dormancy in some short-duration rices [India]
1987
Kundu, C. | Ghosh, A. | Ghosh, R. (Rice Research Station, Chinsurah (India))
Seed dormancy was assessed in 11 traditional rice varieties, and 14 promising short-duration (90-110 d) breeding lines grown during aus (Mar-Sep), when preharvest seed sprouting in the field often follows monsoon rains. Seeds collected 30 d after flowering, coinciding with peak monsoon months, were dried to 13-14% moisture content. Germination at harvest and length and intensity of dormancy were measured. Dormancy intensity was determined by the time necessary to break dormancy with 50 C heat treatment for 4 d. Dormancy length was days to attain 80% germination under ambient conditions. Dormancy was 15-44 d in the traditional varieties and 27-54 d in the breeding lines. Many traditional varieties had strong seed dormancy; all the breeding lines except CR289-1208 (IET 7255) were weakly dormant. China aus attained 100% germination after heat treatment and had very weak dormancy.
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