黄淮大豆品系抗大豆胞囊线虫2号生理小种评价
- Title:
- Evaluation of Soybean Lines from Huang-Huai Region for Resistance to Soybean Cyst Nematode Race 2
- 摘要:
- 为精准评价黄淮地区大豆品系对胞囊线虫(Soybean Cyst Nematode,SCN)的抗性,本研究对211份黄淮地区育成大豆品系的SCN2抗性进行鉴定,同时利用抗SCN主效位点rhg1和Rhg4连锁的KASP标记进行基因型检测,并对含有这两个位点的抗性种质的抗性位点拷贝数进行分析。表型鉴定结果表明:211份品系中,1份表现中抗,占品系总数的0.47%;7份表现中感,占品系总数的3.32%;203份表现感病,占品系总数的96.21%;未发现免疫和高抗品系。基因型鉴定结果表明:郑12019同时含有rhg1-a和Rhg4抗性位点,和Peking基因型一致;冀Y2305只含有rhg1-a抗性位点;中作J20287只含有rhg1-b抗性位点,和PI 88788基因型一致;科豆78只含有Rhg4抗性位点;其余207份品系均是感病基因型,占品系总数的98.10%。此外,本研究还对表现中抗的郑12019进行基因组重测序,使用CNVpytor和FREEC程序分析其抗SCN两个主效位点rhg1和Rhg4的拷贝数,两程序获得的结果较相似,CNVpytor分析得出郑12019的rhg1和Rhg4位点拷贝数分别为2.52和2.55,而FREEC分析得出郑12019的rhg1和Rhg4位点的拷贝数分别为3和2。以SKIP16为内参基因,数字PCR检测结果表明郑12019的rhg1位点拷贝数为2.66,和Peking的rhg1位点拷贝数相似。本研究为大豆新品种的审定提供依据,同时为抗SCN育种提供理论参考与材料支撑。
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