Abstract: A study of space radiation (Satellite Shi -Jian 8,2006)was carried out on winterwheat 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.

Key words: Wheat, Lunxuan987, Spaceradiation, SP2, Mutationrate, Charactervariation

CLC Number: 

• S512.03