Abstract: Air-dried seed of rice carried by high space balloon were treated for 8 hours under high space condition of 30-35 km from sea level. The character expression of SP1, SP2 generation and the correlative degree between SP3's individual plant and SP4 generation average value were studied. The results indicated that the SP1's germination percentage and germination potential of seed and seed setting of percentage were lower than control, the growth and the date of heading were different in the SP1 generation individual plant each other, more stronger segregation than other mutant factor on 11 kinds of agronomy characters were showed in the SP2 generation, some mutants that have wide compatibility gene, which can restore male sterile lines of indica (Zhenshan 97A, Nong A) and japonica (Hua A, Yue A) were chosen. The correlation between SP3's individual plant and SP4 generation average value was high significant. So it was considered the variation induced by high space condition can be hereditary and high space balloon carried plant seed can be as a new way of mutant breeding.

Key words: Heredity, Mutation breeding, Space condition

摘要： 利用高空气球搭载，使水稻干种子处于海拔30-35 km高空8 h后回收种植，并调查SP1、SP2代的性状表现和SP3代单株与SP4代平均值的相关程度。结果表明：SP1代出现种子的发芽率、发芽势降低，中后期生长不整齐，抽穗期不一致，结实率降低等现象，对SP2代群体所调查的11个农艺性状，均出现比其它诱变因素更为广幅的分离，并获得具有广亲和基因的突变株，对籼型不育系珍汕97A、农A和粳型不育系花A、越A的育性均具有恢复能力。SP3代单株与SP4平均值具有极显著的相关性，因而认为由高空环境引起的变异是可以遗传的，可以作为一种新的诱变育种方法。

关键词: 高空环境, 诱变育种, 遗传性