【摘要】 以培矮64S空间诱变的SP5代大柱头变异不育株系为材料,对其柱头特性进行研究。结果表明,19个变异株系的柱头外露率、柱头长、宽、表面积及体积等性状发生了较大的变化。柱头外露率呈不同程度的降低趋势,变幅为14.1%～64.4%;柱头长、宽、表面积、体积呈不同程度增大趋势,即柱头长度变幅为1.45～1.89 mm,宽度变幅为0.71～1.16 mm,表面积变幅为8.29～15.09 mm2,体积变幅为0.665～1.881 mm3。3个变异株系(BV19-5、BV22-4和BV24-1)的柱头活力变幅为152.3%～192.5%,均强于对照培矮64S的144.5%,且柱头活力下降速度均比对照慢;柱头活力系数变幅为0.93～1.24,均高于对照,达极显著水平。柱头活力与柱头表面积和柱头体积达显著正相关,相关系数分别为0.971 74和0.990 69。说明培矮64S经空间诱变后,定向选育获得的大柱头变异不育株系,柱头活力及活力系数得到明显提高。更多还原

【Abstract】 In this study,the big stigma mutants of P(T)GMS line Pei’ai 64S in SP5 generation were used to investigate the stigma characters,including exsertion rate,length,width,surface area,volume and vitality etc.The results showed that the stigma characters of 19 mutants in SP5 generation changed greatly.Compared with the check Pei’ai64S,the stigma exsertion rates of these mutants decreased with a range of 14.1 to 64.4%,while their stigma length,width,surface area and volume increased to some extent.The stigma lengths of the 19 mutants ranged from 1.45 to 1.89 mm,longer than that of Pei’ai 64S(CK) of 1.44 mm.Eighteen mutants had higher value of stigma width than that of the CK Pei’ai 64S,and the other one had smaller stigma width of 0.71 mm than the CK of.0.75 mm.The Stigma surface areas of the 19 mutants ranged from 8.29 to 15.09 mm2 which were larger than that of the CK of 7.67 mm2.The stigma volume of all the mutants ranged from 0.665 to 1.881 mm3,larger than that of CK of 0.636 mm3.The surface area was positively correlated with the stigma volume.The stigma vitality of three mutants,ranging from 152.3% to 192.5%,was stronger than that of CK with the value of 144.5%.The decline of stigma vitality of 3 mutants,BV19-5,BV22-4 and BV24-1,was slower than that of CK.Stigma vitality coefficient of 3 mutants ranged from 0.93 to 1.24,higher than that of the CK of 0.52,with significant difference compared with the check.The correlation coefficients between Stigma vitality coefficient with the superficial area and the volume were 0.971 74 and 0.990 69 respectively.It is indicated that the big-stigma mutants derived from Pei’ai 64S by space mutation,showed significant improvement in stigma vitality and vitality coefficient.更多还原