【摘要】 籼稻褐稻虱抗源与不同籼、粳稻杂交,后代的抗性反应明显不同。ASD7携带的bph2及Baba-wee携带的bph4两个隐性基因,在与南京11杂交时呈显性表达,杂种F₂代分离为3R:1S。籼稻抗源与粳稻杂交,抗虱性普遍增强,杂种后代呈双基因分离,这种增强作用在与广亲和或有籼稻血缘粳稻杂交时表现明显。转育的粳稻抗源与盐粳2号、南京11、02428杂交,杂种后代的遗传方式与原籼稻同基因抗源基本一致,说明籼稻抗褐稻虱基因导入粳稻后的基因表达具有稳定性,可以在后代中遗传。更多还原

【Abstract】 To study the genetic mode in transferring Indica brown planthopper resistance into Japonica background, Indica sources with various resistant genes, such as IR26 （Bphl）, ASD7 （bph2）, Rathu Heenati （Bph3） and Babawee （bph4） were crossed with Yankeng 2 （Japonica）, 02428 （widely compatible）, Nanjing 11 （Indica） and TNl （Indica, susceptible check） separately. The inheritance of Japonica resistant sources carrying the same resistant genes transferred from Indica was also studied to compare their genetic mode with that of the Indica sources. Some F₁ hybrids were backcrossed with susceptible parents to further test the results. The bulk seedling test was used to evaluate the hybrid progenies for brown planthopper resistance. Their resistant reactions were recorded when the seedlings of the susceptible check were killed.The results indicated that the Indica resistant genes were expressed differently in various nuclear-cytoplasm backgrounds. For example, the recessive resistant genes of Indica ASD7 and Babawee were expressed dominantly in the hybrids when they were crossed with the Indica variety Nanjing 11, and the F₂ population segregated 3R:lS. When Indica resistant sources were crossed with Japonica rice, especially with wide compatibility lines or Indica-Japonica hybrid progeny, the resistant genes were expressed more strongly and F₂ population segregated 15R : 1S or 13 R : 3 S. When Yankeng 2, 02428 and Nanjing 11 were crossed with Japonica sources carrying resistant genes tansferred from Indica, the resistance segregated at the same ratio as crossed with the Indica itself, indicating that the gene expression was stable and could be inherited in the progeny.更多还原