基因型和温度对陕2ACMS育性的影响

Effect of Genotype and Air Temperature on the Expression of Shaan 2A Cytoplasmic Male Sterility in Winter Rape ( Brassica napus L.)

以７个同质（陕２Ａ胞质）异核不育系为试材，研究了基因型及开花前５～１６ｄ气温（日平均气温，日最高气温，日最低气温）对ＣＭＳ育性的影响。结果表明，这７个不育系间ＭＳＩ存在显著差异，不育系２０９Ａ的ＭＳＩ值仅有０．２５０，而不育系１８２Ａ则达１．３５０，其它５个不育系的ＭＳＩ值介于二者之间；开花前气温对不同不育系ＭＳＩ影响程度不同，除不育系１９５Ａ外，其它６个不育系ＭＳＩ都与开花前气温有关，且气温对不同不育系雄蕊发育的影响时期亦不同。

The effects of seven genotypes with the same cytoplasm(Shaan 2A cytoplasm) and different nuclei and air temperatures(day mean temperature, day highest temperature and day lowest temperature) during day prior to flowering on the fertility expression of CMS line were studied in the experiment. The results showed that, there existed significant differences among seven male sterile lines with Shaan 2A cytoplasm in their male sterility index (MSI),MSI of the male sterile line 209A only was 0.250, but MSI of the male sterile line 182A was 1.350, MSI of five other male sterile lines were between that of 209A and 182A; The air temperature prior to flowering had different effects on the different male sterile lines, execept male sterile line 195A, MSI of six other male sterile lines had close relationship with air temperature in the field prior to flowering and the time of air temperture effects of anther development was different in different male sterile lines.