STUDIES ON THE STERILE GENES AND ITS RESTORER GENES IN PHOTOPERIOD-SENSITIVE MALE-STERILE RICE
Shao You Tang Xihua~* Hunag Qingliu Pan Guozeng(Shanghai Institute of Plant Physiology, Academia Sinica, Shanghai 200032, China.) Author for correspondence
Segregation for fertility was identified in 1990～1992 under the natural longday conditions in F_2 (22 cross combinations)and B_1F_1(3 cross combinations) of photoperiod-sensitive male-sterile lines, Nongken 58S and its derivatives. The male parents were Japonicas, Indicas, Javanica and derivatives from Indica-Japonica hybrids.The result shows that the inheritance of photoperiod-sensitive sterility is under the control of two pairs of independent recessive genes, and the corresponding restorer genes exist not only in japonica but also in indica and javanica rice. The fertility segregation of F_2 populations shows the ratio of 15:1 and that of B_1F_1 the ratio of 3:1 when the restorer parents have the two pairs of restorer genes. On another occasion the fertility segregation of F_2 populations shows the ratio of 3:1, which is due to only one pair of restorer genes with anotherpair of sterile genes originally existing in the restorer parents. Moreover, the experiment also proved that the one pair of sterile genes in Nongken 58S and its derivatives were induced from Nongken 58, and were allelic to the sterile genes in BT-type sterile rice "Hanfeng A".Therefore it is safe to say that Nongken 58S resulted from the mutation of one recessive photoperiod-sensitive gene locus of Nongken 58, and its photoperiod-sensitive sterility is due to the interaction of this mutant gene and the original BT-type allelie sterile gene.
【Fund】： 中国国家自然科学基金;; 上海市科委农委发展基金