QTL Mapping of Fusarium Ear Rot Resistance in Maize

文献类型： 外文期刊

第一作者： Wen, Jing

作者： Wen, Jing;Shen, Yanqi;Wang, Ziyu;Han, Siping;Li, Shijie;Yang, Chunming;Hao, Dongyun;Zhang, Yan;Xing, Yuexian

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关键词： Fusarium ear rot; Fusarium verticillioides; maize; mapping; quantitative trait locus

期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）

ISSN： 0191-2917

年卷期： 2021 年 105 卷 3 期

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收录情况： SCI

摘要： Ear rot is a globally prevalent class of disease in maize, of which Fusarium ear rot (FER), caused by the fungal pathogen Fusarium verticillioides, is the most commonly reported. In this study, three F-2 populations, namely F-2-C, F-2-D, and F-2-J, and their corresponding F-2:3 families were produced by crossing three highly FER-resistant inbred lines, Cheng351, Dan598, and JiV203, with the same susceptible line, ZW18, for quantitative trait locus (QTL) mapping of FER resistance. The individual crop plants were inoculated with a spore suspension of the pathogen injected into the kernels of the maize ears. The broad-sense heritability (H-2) for FER resistance was estimated to be as high as 0.76, 0.81, and 0.78 in F-2-C, F-2-D, and F-2-J, respectively, indicating that genetic factors played a key role in the phenotypic variation. We detected a total of 20 FER-resistant QTLs in the three F-2 populations, among which QTLs derived from the resistant parent Cheng351, Dan598, and JiV203 explained 62.89 to 82.25%, 43.19 to 61.51%, and 54.70 to 75.77% of the phenotypic variation, respectively. Among all FER-resistant QTLs detected, qRfer1, qRfer10, and qRfer17 accounted for the phenotypic variation as high as 26.58 to 43.36%, 11.76 to 18.02%, and 12.02 to 21.81%, respectively. Furthermore, QTLs mapped in different F-2 populations showed some extent of overlaps indicating potential resistance hotspots. The FER-resistant QTLs detected in this study can be explored as useful candidates to improve FER resistance in maize by introducing these QTLs into susceptible maize inbred lines via molecular marker-assisted selection.

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