Abstract: In order to improve the extrusion of photo-and thermo-sensitive sterile line Pei′ai 64S by the use of elongated uppermost internode(eui) gene of wide compatibility rice 02428h,a new photo-and thermo-sensitive sterile line P8hS characterized by the elongated uppermost internode was bred by transferring the eui gene into Pei′ai 64S through three times of successive backcrossing.Compared with Pei′ai 64S,the plant height of P8hS was 35.6 cm higher,resulting from the elongation of the uppermost internode and the second internode from the top.The extrusion of Pei′ai 64S was completely improved and positive effects were found on the main economic characters of P8hS and its hybrids by introducing eui gene into Pei′ai 64S.

Key words: rice(Oryza sativa), recessive tall height mutant, elongated uppermost internode gene, inheritance, backcrossing, breeding, male sterile line

摘要： 为研究隐性高秆水稻“02428h”的长穗颈基因eui在减轻不育系包颈度中的利用价值，以02428h为父本，培矮64S为母本和轮回亲本，经过连续3次回交将02428h的eui基因导入培矮64S，转育成了具有长穗颈基因的“P8hS”。与培矮64S相比，P8hS的株高增加35.6 cm，主要是穗颈节和倒2节间长度增加所致。eui基因的导入不仅可使培矮64S的穗包颈得到彻底改善，而且对培矮64S及其杂种的主要经济性状具有促进作用。

关键词: 水稻, 隐性高秆突变体, 长穗颈基因, 遗传, 回交转育, 育种, 不育系