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稻褐飞虱(BPH,NilaparvatalugensSt#l)是中国和世界稻区最严重的水稻害虫之一,发现和利用新抗性基因和进行抗性种质创新对于稻褐飞虱抗性品种的培育具有重要的意义。本研究进行了1200多份普通野生稻(OryzarufipogonGriff)种质对多种BPH生物型的抗性鉴定,获得了30份抗性资源,其中6份对分布于世界主要稻区的稻褐飞虱生物型1和2、孟加拉、湄公河(越南)、九龙江(越南)、潘特纳加(印度)等6种生物型或其中5种具有广谱高抗性。遗传分析证明了这些种质对BPH生物型2和九龙江生物型的抗性受2对重复作用隐性基因控制,对潘特纳加生物型的抗性受1对隐性基因控制,表明抗源对不同褐飞虱生物型具有不同的遗传机制。普通野生稻材料2183存在的2对隐性基因很可能是新发现的基因,因为在这些染色体区域还没报道有BPH抗性基因,这两对基因暂命名为bph18(t)和bph19(t)。研究总共培育出143份抗性创新种质和6份抗性品系或高产优质杂交水稻组合,这些优良的抗性创新种质为培育抗性新品种建立了坚实的基础。
Nilaparvata lugens (BPH) is one of the most serious rice pests in China and the world rice fields. It is of great significance to discover and utilize new resistance genes and to carry out innovation of resistant germplasm for the cultivation of the resistant varieties of rice brown planthopper. In this study, the resistance of more than 1200 wild Oryza species (Oryzarufipogon Griff) germplasms to several BPH biotypes was evaluated, and 30 resistant resources were obtained. Among them, 6 were resistant to the brown planthopper biotype 1 And 2, 6 species of biotypes including Bangladesh, the Mekong (Vietnam), Jiulongjiang (Vietnam) and Pannaga (India), or 5 of them have broad spectrum of high resistance. Genetic analysis demonstrated that the resistance of these germplasms to BPH biotype 2 and the Jiulongjiang biotype was controlled by two pairs of recessive recessive genes and that the resistance to the pannagarga biotype was controlled by one recessive gene, indicating Resistance to different brown planthopper biotypes have different genetic mechanisms. Two pairs of recessive genes existing in common wild rice material 2183 are likely to be newly discovered genes because no BPH resistance genes have yet been reported in these chromosomal regions and the two genes are tentatively named bph18 (t) and bph19 (t) . In total, 143 combinations of resistant and 6 resistant or high-yielding and good-quality hybrid rice were developed. These excellent resistant and innovative germplasms provide a solid foundation for breeding new resistant varieties.