水稻具有杂种优势现象,尤以秈粳杂种更为突出~([1]),但因人工杂交制种困难,到现在为止尚未能利用.显然,要想利用水稻的杂种优势,首先必须解决大量生产杂种的制种技术,从晚近作物杂种优势育种的研究趋势和实际成果来看,解决这个问题的有效途径,首推利用雄性不孕性.为了获得水稻的雄性不孕材料,我们最近两年在水稻大田里进行了逐穗检查工作,观察到一些雄性不孕植株,现将初步观察结果,报导如下: Rice has heterosis, especially in hybrids of indica and japonica (1), but it has not been able to utilize it until now due to the difficulty of seed production by artificial hybridization.Obviously, in order to utilize the heterosis of rice, we must first solve it Mass production of hybrid seed production techniques, the crop recent heterosis breeding trends and the actual results, the effective way to solve this problem, the most important use of male infertility.In order to obtain male infertility materials of rice, we recently Year-by-year in the rice fields in the inspection work by the spike observed some male infertility plants, the preliminary observations are now reported as follows: