一种创造高频率易位系的方法——不同种属代换系杂交

A Method of the Higher Frequency of Producing Translocations- the Hybridization of Two Different Wheat alien Substitutions

首次报道了利用小麦 -簇毛麦二体代换系贵农 2 2与小麦中间偃麦草二体代换系遗 4 2 12杂交 ,在其杂种F2群体中染色体易位频率高达 3 7% ,其中既有臂间易位也有双插入易位 ,并出现小麦 -簇毛麦、小麦 -中间偃麦草染色体易位系 ,而贵农 2 2、遗 4 2 12与中国春杂交种F2群体中易位频率分别为 1 7%和 0 %。结果表明 :利用小麦的不同种属异源二体代换系之间相互杂交 ,既有可能是一条能产生高频易位的新途径 ,也是创造特殊遗传和育种材料的有效手段。

WT5BZ]It was reported firstly that the translocation frequency was up to 3.7%, which was obtained in the F2 population of the cross between a Triticum Haynaldia substitution, Guinong22, and a Triticum Thinopyrum substitution, Yi4212. The pattern of translocations included not only wheat alien Robertson translocation involving only one kind of alien chromatin, such as Thinopyrum chromatin or Haynaldia chromatin but also double insertion translocation involving Haynaldia chromatin. In the F2 population of hybrids from the cross of Guinong22 and Chinese spring and the cross of Yi4212 and Chinese spring, the translocation frequencies were 1.7% and 0%, respectively. The result indicates that it may be not only a new method of producing high translocation frequency; but an efficient means of creating special genetics and breeding materials by making two different wheat alien substitutions crossing with each other.