喷施“九二○”对光温敏核不育系柱头外露的影响

Study on response of stigma exsertion rate of photo-thermo sensitive genic male sterile lines to “920”

选用4个光温敏核不育系,考察其在自然条件和喷施“九二○”条件的柱头外露率,了解其柱头外露特性,研究喷施“九二○”对不育系柱头外露的影响.结果表明,自然条件下各不育系柱头总外露率介于79.8％～87.1％之间,处于较高水平,GD-7S最高,各不育系外露柱头都是单边外露居多.在喷施“九二○”条件下,各不育系（除GD-7S）柱头总外露率得以提高,普遍提高柱头单边外露率,对柱头双边外露率则因不育系而异,兴86S柱头总外露率对“九二○”反应最好,提高程度最高.可见,“九二○”能提高不育系柱头外露率,尤其是单边外露率.

To understand stigma exsertion characters of photo-thermo sensitive genic male sterile lines （ PTGMS lines ）, the effects of ＂920＂ on stigma exsertion of 4 PTGMS lines were studied by spraying with ＂920＂ or not in the natural field conditions. The results showed that under natural conditions the stigma exsertion rates of the 4 PTGMS lines were at a high level between 79.8%-87.1% and the line with highest stigma exsertion rate was GD-TS, and most of the stigma exsertion were unilateral. The totalstigma exsertion rates of the PTGMS （ except GD-7S ） were all increased by spraying with ＂920＂ , especially for the unilateral stigma exsertion. For the bilateral stigma exsertion rates, the responses of the different PTGMS lines to ＂920＂ were different. The line with largest increase of stigma exsertion rate and best response to ＂920＂ was Xing86S. It could be seen that ＂920＂ could increase the stigma exsetion rates of the PTGMS lines in this study, especially the unilateral stigma exsertion rate.