CCRRFCalifornia Cooperative Rice Research Foundation
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M7 (Carnahan et al., 1978) is a semidwarf medium-grain cultivar and R660 is a sister line of `L-201' (Tseng et al., 1979) developed by CCRRF. R1588 is a semidwarf long-grain selection from a cross of experimental selection 72-3761/72-32228 where 72-3761 is a selection from PI 321161, a tall, long-grain introduction from the International Rice Research Institute that was moderately resistant to cool temperature induced sterility.