现有的杂交水稻组合,在长江流域各省作早稻栽培,生育期普遍偏长。选育早熟高产的杂交组合,以适应双季稻生产的需要,是当前“三系”选育的重要课题。 实践证明,“野败”型杂交水稻生育期受双亲平均值的制约,现有的不育系生育期又已经很短,再短就势必影响其他经济性状。因此,选育 The existing hybrid rice combination, early rice cultivation in the provinces of the Yangtze River Basin, generally longer growth period. Breeding of early maturity and high yield of hybrid combinations to meet the needs of double cropping rice is the current “three lines” breeding an important issue. Practice has proved that “wild-type” hybrid rice growth period by the parents of the average constraints, the existing sterile growth period has been very short, then the short is bound to affect other economic traits. Therefore, breeding