Abstract
In the three-line system (A/B/R) of heterosis breeding in rice, genetic diversity of the A line is very important. The F1 hybrids of indica/japonica crosses show semisterility. Some wide compatibility varieties do produce fertile F1 hybrids when crossed with indica as well as with japonica varieties. A cytoplasmic male sterile (CMS) line with a wide compatibility gene will be useful in developing indica/japonica hybrids that can overcome sterility problems.
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