杂交水稻的研究和推广在我国已取得了巨大的成功,鉴于水稻天然异交率通常低于1％,用于生产的水稻不育系仍然保持着适宜自交的花器结构,因而导致不育系异交率低,杂种种子生产成本高。故改良水稻的花器性状,使之适于异交,从而促进杂交种子生产,具有重要意义。Virmani等(1980)研究了国际稻86个主要品种、品系的花器性 The research and popularization of hybrid rice has achieved great success in our country. In view of the fact that natural rate of outgrowth of rice is usually less than 1%, the sterile lines of rice used in the production still maintain the structure of flower arrangement suitable for selfing, Outcrossing rate is low, hybrid seed production costs high. Therefore, it is of great significance to improve the floral traits of rice and make it suitable for cross-breeding to promote the production of hybrid seeds. Virmani et al. (1980) studied the floral properties of 86 major varieties of international rice