籼稻品种浙辐802抗瘟性遗传研究

通过与８个日本鉴别品种杂交和利用日本代表菌系研５４－０４及我国南方稻区菌系９５-ｈ接种鉴定，研究了籼稻品种浙辐８０２的抗性遗传。研究结果表明，该品种对菌系研５４-０４的抗性由 ２对显性基因控制，对菌系 ９５-ｔ２的抗性由 １对显性基因控制。基因等位性分析确认，浙辐８０２中抵抗９５－ｔ２的抗病基因与Ｐｉ－ｉ基因等位，与Ｐｉ－ａ、Ｐｉ－ｓｈ、Ｐｉ－ｋ、Ｐｉ－ｚ、Ｐｉ－ｂ、Ｐｉ－ｔ、Ｐｉ－ｔａ等已知基因位点为非等位关系；抵抗菌系研５４－０４，感染菌系９５-ｔ２的基因与Ｐｉ－ｉ、Ｐｉ－ｋ、Ｐｉ－ｂ、 Ｐｉ－ｔ ４个已知基因位点为非等位关系。对这个基因与其他已知基因的等位性进行了分析，认为它可能是１个未被命名的新基因。

Genetic Studies of Blast Resistance of indica Variety Zhefu 802

One indica variety, Zhefu 802, was studied for its inheritance of blast resistance by inoculation of two strains Ken54ro4 and 95-t2. The B1F1 and F2 populations from cross of Zhefu 802(R) X Lijiangxintuanheigu (S) and related parents were inoculated by spray inoculation method with the two above mentioned strains to determine R;S ratio of segregating populations of this cross. The results indicated that Zhefu 802 has two dominant resistance genes to strain Ken 54-04. One of the two genes showed resistant reaction and the other is susceptible to strain 95-t2. The allelism test indicated that one gene in Zhefu 802, which showed resistant reaction to strain 95-t2, is allelic to Pi-i gene locus and non-allelic to loci of Pi-a, Pi-sh, Pi-k Pi-z, Pi-ta, Pi-b, Pi-t. The other gene in mis variety was also estimated to be different from all of the known genes. So it may be an unknown gene. But thes point needs to be confirmed further.