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The ability to intercross between rice subspecies in order to obtain hybrids those are not sterile and have a high seed setting rate, can be used to consider in the development of hybrid rice variety. The objective of this study was to evaluate seed setting rate of F1 hybrid from crosses between indica rice and other types. The results showed that seed setting rate of F1 hybrid obtained from cross intra-type hybrid was higher than that of inter-type hybrid. The F1 hybrid from cross indica/indica was the highest seed setting rate followed by indica/javanica, indica/NERICA, and indica/japonica. The javanica and NERICA types were combined with indica type and resulted in the F1 hybrids with ability to produce seed. Thus, utilization of heterosis by selected varieties for hybridization indica/javanica or indica/NERICA was an alternative way to solve low seed setting rate in F1 hybrid of cross indica/japonica.
Keywords: hybrid rice; seed setting rate; wide compatibility
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