Is the Female Sterility Present in indica-japonica Hybrid Rice?

Hybrid sterility in the F 1 populations of wide crosses in rice is a common phenomenon but the genetic basis of the sterility is complex.Whether male or female sterility is the main cause of the hybrid sterility remains controversial.This paper summarized the experiments which support or negate the existence of female sterility,analyzed the experimental ideas and inference methods of these experiments,especially Sano's;and concluded that the conclusion that the hybrid sterility is only caused by male or female sterility is a one-sided view,therefore attention should be paid to the genetics of both female and male sterility.