为了评价抗茎腐病基因分子标记在辅助育种中的实用性,对159份玉米自交系进行了茎腐病田间抗性鉴定,并检测了与4个茎腐病抗性QTL (qRfg1、qRfg2、RpiQI319-1和RpiQI319-2)连锁的11个分子标记在上述材料中的扩增情况。结果表明:供试玉米自交系的平均发病率为26.30%,发病率低于30%的材料占67.92%,抗病资源丰富。与东北和西南地区种质相比,黄淮海地区抗性种质相对缺乏。通过比较标记扩增与田间表型的结果,发现分子标记STS01(qRfg1)、STSZ479(qRfg2)、bnlg1866(RpiQI319-1)和bnlg1716(RpiQI319-2)的阳性检测结果与田间表型符合度较高,分别为76.79%、78.95%、91.67%、73.33%,具有上述特异扩增多态性的材料平均发病率分别为22.06%、19.01%、10.65%、19.63% ,可做为抗茎腐病分子检测的有效标记。本研究为开展玉米抗茎腐病分子育种提供了重要参考。
In order to evaluate the practicability of molecular markers linked to stalk rot resistance genes in maize, 159 maize inbred lines were used to screen resistance on stalk rot in fields, and eleven molecular markers linked to four resistance QTLs, qRfg1, qRfg2, RpiQI319-1 and RpiQI319-2 were tested. The results showed that more than half of the tested materials belong to middle or high resistance. The average of incidence rate of total materials is 26.30%, and the materials of incidence less than 30% accounted for 67.92%. The proportion of resistant germplasms in Huanghuaihai region is lower than that in Northeast region or Southwest region. Practicability of molecular markers was evaluated for the conformity between genotype and phenotype. Four molecular markers, STS01 (qRfg1), STSZ479 (qRfg2), bnlg1866 (RpiQI319-1) and bnlg1716 (RpiQI319-2) have the high conformity, 76.79%, 78.95%, 91.67%, and 73.33%, respectively. The average incidence rate of positive materials detected by above markers was 22.06%, 19.01%, 10.65%, and 19.63%, respectively. Thus,STS01, STSZ479, bnlg1866 and bnlg1716 can be used as effective markers to molecular assisted selection on stalk rot resistance in maize breeding.
王金萍,刘永伟,孙果忠,等.抗茎腐病分子标记在159份玉米自交系中的验证及实用性评价[J].植物遗传资源学报,2017,18(4):754-762.
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