水稻抗病性的遗传研究Ⅰ.水稻对白叶枯病抗性的遗传

 在1983-84两年中,用赣W-2和赣S-3两白叶枯病菌株分别接种8个杂交水稻组合的亲本、F₁、F₂和F₃代的结果表明,各抗病亲本所具有的抗W-2菌株的基因数目和作用方式均与其抗S-3菌株的基因数目和作用方式相同。就对W-2或S-3菌株的单一抗性来说,早36具有2对显性抗病基因;VT34-1具有2对互补的显性抗病基因;IR26和3624-33都具有3对互补的显性抗病基因。
在VT34-1中,有1对基因既控制对W-2菌株的抗性又控制对S-3菌株的抗性,另外2对基因则分别控制对这两菌株之一的抗性。在早36中,抗W-2菌株的2个独立基因分别与抗S-3菌株的2个独立基因连锁,其配子重组值为13.3%,基因重组值为6.887%。在IR26和3624-33中,抗W-2的菌株的3个独立基因均与抗S-3菌株的3个独立基因连锁,但它们的配子重组值和基因重组值均无法估计。预料同时选择对W-2和S-3菌株的抗性非常容易。

GENETIC STUDIES OF DISEASE RESISTANCE IN RICE Ⅰ.INHERITANCE OF RESISTANCE TO BACTERIAL BLIGHT OF RICE

In 1983 and 1984 experiments with 2 strains,W-2 and S-3,of Xanthomonas campestris pv.oryzae (Ishiyama) Dye to inoculate riceplants p1,p2,F1,P2,and F3 generaton from 8 crosses revealed that in each resistant parent,the number and action mode of resistance gene(s)to W-2 were the same as those to S-3.As for the resistance to W-2or S-3,The cvs Early 36 had 2 dominant resistance genes and VT34-12 complementary dominant resistance genes.Both IR26 and 3624-33 had 3 complementary dominant resistance genes.
In VT34-1,there was 1 gene conferring resistance to both strainsW-2 and S-3,and there were 2 other genes,each conferring resistance to 1 of the 2 strains.In Early 36,its 2 independent resistance genes to strain W-2 were linked to its 2 independent resistance genes to strain S-3,respectively,with a gamete recombination value of 13.3% and a gene recombination value of 6.887%.In IR26 and 3624-33,their 3 independent resistance genes to W-2 were also linked to their 3 independent resistance genes to S-3,however,there was no way to estimate the recombination values either for the gametes or for the genes.Simultaneous selection of resistance to the 2 bacterial strains was considered to be feasible.