春化和光周期基因在陕西小麦品种中的分布

为了解陕西小麦品种中春化基因和光周期基因的分布特点,采用STS标记检测了陕西境内173份小麦品种春化基因Vrn-A1、Vrn-B1、Vrn-D1、Vrn-B3和光周期基因Ppd-D1位点的显性等位变异组成.结果表明,4个春化基因位点显性等位变异在陕西小麦中的平均分布频率不同,顺序为Vrn-D1(38.2%)＞Vrn-B1(16.2%)＞Vrn-A1(1.2%)＞Vrn-B3(0%).春化显性等位变异在陕西境内各麦区的分布频率也不同:归属于北部冬麦区的小麦品种4个春化位点均处于隐性状态;归属于黄淮冬麦区的小麦品种显性等位变异分布比例顺序为Vrn-D1(41.7%)＞Vrn-B1(19.1%)＞Vrn-A1(0%)=Vrn-B3(0%);归属长江中下游麦区的为Vrn-D1( 40.3%)＞Vrn-B1(16.1%)＞Vrn-A1(0%)=Vrn-B3(0%),归属西南冬麦区的为Vrn-D1(54.6%)＞Vrn-A1(18.2%)=Vrn-B1(18.2%)＞Vrn-B3(0%).在光周期Ppd-D1位点,99.4%的品种携带对光周期反应不敏感的显性等位变异Ppd-D1a.陕西境内推广的小麦品种中存在7种春化和光周期基因显性等位变异组合,即Vrn-D1、Ppd-D1a、Vrn-B1/Ppd-D1a、 Vrn-D1/Ppd-D1a、Vrn-A1/Vrn-B1/Ppd-D1a、Vrn-A1/Vrn-D1/Ppd-D1a 和Vrn-B1/Vrn-D1/Ppd-D1a,平均分布频率为0.6%、49.7%、11.6%、32.3%、0.6%、0.6%和4.6%.5个位点显性等位变异组合在陕西境内不同麦区分布也不同:归属于北部冬麦区的检测小麦品种中,均携带单一显性等位变异Ppd-D1a;归属于黄淮冬麦区的小麦品种中,显性等位变异组合出现5种类型,即Vrn-D1、Ppd-D1a、Vrn-B1/Ppd-D1a、 Vrn-D1/Ppd-D1a和Vrn-B1/Vrn-D1/Ppd-D1a,比例分别为1.2%、45.2%、13.1%、34.5%和6.0%;归属于长江中下游冬麦区的小麦品种中存在4种显性等位变异组合类型,即Ppd-D1a、Vrn-B1/Ppd-D1a、 Vrn-D1/Ppd-D1a和Vrn-B1/Vrn-D1/Ppd-D1a,分别占45.2%、14.5%、37.1%和3.2%;归属于西南冬麦区的小麦品种中存在5种类型,分布比例次序为Ppd-D1a(36.3%)=Vrn-D1/Ppd-D1a(36.3%)＞Vrn-A1/Vrn-B1/Ppd-D1a(9.1%)=Vrn-A1/Vrn-D1/Ppd-D1a(9.1%)=Vrn-B1/Vrn-D1/Ppd-D1a(9.1%).这些信息为陕西选育广适性小麦品种提供了依据.

Distribution of Vernalization and Photoperiod Genes in Shaanxi Wheat Cultivars

In order to survey the distribution of vernalization and photoperiod genes in Shaanxi wheat cultivars,173 cultivars were characterized with STS markers for the vernalization and photoperiod genes Vrn-A1,Vrn-B1,Vrn-D1,Vrn-B3 and Ppd-D1.The average frequency of dominant alleles at the four vernalization gene loci in Shaanxi wheat cultivars was ranked as Vrn-D1(38.2%)>Vrn-B1(16.2%)>Vrn-A1b(1.2%)>Vrn-B3(0%).The frequencies of dominant alleles at vernalization Vrn-A1,Vrn-B1,Vrn-D1,Vrn-B3 loci among the four whea...