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国际水稻研究所于一九七○年间由前副所长D.S.Athwal博士和S.S.Virmani博士主持杂交水稻研究工作,开展了籼型不育系的选育与水稻异花授粉花器性状的观察研究。之后,由S.S.Virmani选育成台中本地1号(TN1)胞质的盘克哈利203(Pankha-ri203)等不育系,其不育性基本稳定,但自然异交率极低,且是高杆品种。由于他们对杂种F_1的优势表现,能否选育出满意的异交特性的水稻不育系,顺利地进行杂种种子生产信心不足,因此,很快停止此项研究工作。
In 1970, International Rice Research Institute led the work of hybrid rice by former Deputy Director Dr. D.S.Athwal and Dr. S.Sirvirmani, and carried out the research on the breeding of indica CMS and flower traits in cross-pollination of rice. After that, sterile lines such as Pankha-ri203, which was bred by SSVirmani into the local TN1 cytoplasm in Taichung, were basically sterile, but their natural outcrossing rate was very low and high Rod varieties. Due to their superiority in F1 hybrids, they could not breed the male sterile lines with satisfactory outcrossing characteristics and lack of confidence in the successful production of hybrid seeds. Therefore, the research was stopped soon.