【摘要】 通过对我国首颗航天育种专用卫星"实践八号(2006)"搭载冬小麦轮选987 SP2分离世代及地面对照农艺性状进行观察发现:航天辐射诱导冬小麦轮选987发生变异,SP2群体变异株率为4.06%。在入选的变异后代中,株高、穗长、株穗数、主茎小穗数、主茎穗粒数、主茎小穗密度、单株平均穗粒数、千粒重诸性状变异幅度不一,分别为-40.39%~29.40%、-30.23%~40.70%、-70.37%~107.41%、-47.78%~14.88%、-22.22%~78.78%、-69.07%~44.33%、-55.57%~21.63%、-59.66%~29.99%和-81.12%~84.80%。变异是双向的,上述性状间正向变异株率为0.74%~2.75%,负向变异株率为1.27%~2.90%。就单一性状而言,上述各性状单株变异率分别为4.05%,3.87%,3.44%,2.50%,3.39%,2.45%,4.05%和4.02%。更多还原

【Abstract】 A study of space radiation(Satellite Shi-Jian 8,2006) was carried out on winter wheat Lunxuan 987 and the results of its derivated SP2 showed:Space radiation could induce its variation,plant mutation rate(MR) was 4.06%.Different characters performed a varied MR,range of variation of plant height,head length,heads/plant,spikelets/main stem,spikelets density,seeds/plant,1 000-grain weight were-40.39%—29.40%,-30.23%—40.70%,-70.37%—107.41%,-47.78%—14.88%,-22.22%—78.78%,-69.07%—44.33%,-55.57%—21.63%,-59.66%—29.99% and-81.12%—84.80% individually.Variation was bidirectional,0.74%-2.75% positive variation and 1.27%—2.90% negative one was recorded for the above characters.For every character the plant MR was 4.05%,3.87%,3.44%,2.50%,3.39%,2.45%,4.05% and 4.02%,respectively.更多还原