Feng Xuanjun, Xiong Hao, Zheng Dan, Xin Xiaobing, Zhang Xuemei, Wang Qingjun, Wu Fengkai, Xu Jie, Lu Yanli
State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Chengdu, China.
Maize Research Institute, Sichuan Agricultural University, Chengdu, China.
Front Plant Sci. 2022 Jul 14;13:942397. doi: 10.3389/fpls.2022.942397. eCollection 2022.
Fusarium ear rot (FER) is a common fungal disease in maize ( L.) caused by . Resistant germplasm resources for FER are rare in cultivated maize; however, teosintes ( ssp. and ssp. ), which are wild-type species of maize, have the potential to offer a novel source of resistance alleles to enhance pathogen resistance in modern maize. Therefore, the aim of this study was to identify favorable alleles that confer significant levels of resistance toward FER. Three populations of BCF recombinant inbred lines (RILs) were developed by crossing two different teosintes, and , with maize inbred lines B73 and Zheng58, and were screened for FER resistance. We found that and had higher resistance toward in the leaves than B73 and Zheng58. However, the resistance toward s in the leaf and ear was unrelated among RILs. FER resistance was positively correlated with grain yield in the B73 × (BD) and Zheng58 × (ZP) populations, partly because the quantitative trait loci (QTLs) of FER resistance and yield traits were located close together. Four coincident QTLs (bd5.177, bd10.140, zp4.066, and zp5.116) and two highly reliable resistance-yield synergistic QTLs (10.140 and zp4.066) were identified in the BD and ZP populations, opening up the possibility of breeding for FER resistance without reducing yield.
镰刀菌穗腐病（FER）是玉米（L.）中一种常见的真菌病害，由……引起。栽培玉米中抗FER的种质资源稀少；然而，作为玉米野生型物种的大刍草（亚种和亚种）有可能提供新的抗性等位基因来源，以增强现代玉米对病原体的抗性。因此，本研究的目的是鉴定赋予对FER显著抗性水平的有利等位基因。通过将两种不同的大刍草与玉米自交系B73和郑58杂交，构建了三个BCF重组自交系（RIL）群体，并对其进行了FER抗性筛选。我们发现，在叶片中，和对……的抗性高于B73和郑58。然而，RIL群体中叶片和果穗对……的抗性无关。在B73×（BD）和郑58×（ZP）群体中，FER抗性与籽粒产量呈正相关，部分原因是FER抗性和产量性状的数量性状位点（QTL）位置相近。在BD和ZP群体中鉴定出四个重合QTL（bd5.177、bd10.140、zp4.066和zp5.116）和两个高度可靠的抗性-产量协同QTL（10.140和zp4.066），这为在不降低产量的情况下培育抗FER品种提供了可能性。
