BT型和印水型同核异质粳稻不育系开花习性研究OA

Three groups of isonuclear alloplasmic cytoplasmic male sterility(CMS)lines of japonica rice with over 10 generations of backcrossing and their maintainer lines were used as experimental materials.The flowering dynamics of single panicles,daily flowering dynamics,glume opening angles,and stigma exsertion rates of experimental materials were observed and analyzed.The results showed that after BT-type(Baotai-type)CMS lines of japonica rice were transformed into Yinshui-type CMS lines of japonica rice,the two types of CMS lines were basically the same in the initial flowering time.After the initial flowering,the daily flowering number of Yinshui-type CMS lines of japonica rice began to decline after rapid growth,and then grew again to reach the peak flowering stage.The peak flowering stages of the two types of CMS lines were basically the same,which had little effect on the reproduction of CMS lines and the seed production of hybrid rice.Two peak flowering stages existed in the whole flowering process of Yinshui-type CMS lines of japonica rice,exerting a positive effect on the outcrossing seed setting rate.The flowering time of BT-type CMS lines of japonica rice was relatively concentrated,while that of Yinshui-type CMS lines of japoncia rice was relatively scattered and lasted longer.There was no significant difference in the glume opening and closing time between the two types of cytoplasms.Yinshui-type CMS lines of japonica rice had significantly larger glume opening angles than BT-type CMS lines of japonica rice.In terms of the stigma exsertion rate,the Yinshui-type Liluxian A was extremely significantly better than the BT-type Liluxian A,and the other two groups of CMS lines had their own advantages and disadvantages.Therefore,in terms of flowering habits,it is feasible to use Yinshui-type CMS lines in the breeding and production of japonica hybrid rice in northern China.