Department of Crop Sciences, University of Illinois Urbana-Champaign, Urbana, IL 61801.
Department of Entomology and Plant Pathology, North Carolina State University, Box 7616 Raleigh, NC 27695.
Phytopathology. 2023 Nov;113(11):2127-2133. doi: 10.1094/PHYTO-09-22-0357-SA. Epub 2023 Nov 17.
Bacterial leaf streak (BLS) of maize is an emerging foliar disease of maize in the Americas. It is caused by the gram-negative nonvascular bacterium pv. . There are no chemical controls available for BLS, and thus, host resistance is crucial for managing pv. . The objective of this study was to examine the genetic determinants of resistance to pv. in maize, as well as the relationship between other defense-related traits and BLS resistance. Specifically, we examined the correlations among BLS severity, severity for three fungal diseases, flg-22 response, hypersensitive response, and auricle color. We conducted quantitative trait locus (QTL) mapping for pv. resistance using the maize recombinant inbred line population Z003 (B73 × CML228). We detected three QTLs for BLS resistance. In addition to the disease resistance QTL, we detected a single QTL for auricle color. We observed significant, yet weak, correlations among BLS severity, levels of pattern-triggered immunity response and leaf flecking. These results will be useful for understanding resistance to pv. and mitigating the impact of BLS on maize yields.
玉米细菌性条斑病（BLS）是美洲玉米新出现的叶部病害。它是由革兰氏阴性非维管束细菌 pv. 引起的。目前尚无针对 BLS 的化学防治方法，因此，寄主抗性对于防治 pv. 至关重要。本研究旨在研究玉米对 pv. 的抗性遗传决定因素，以及与 BLS 抗性相关的其他防御相关性状之间的关系。具体来说，我们研究了 BLS 严重程度、三种真菌病严重程度、flg-22 反应、过敏反应和耳状颜色之间的相关性。我们使用玉米重组自交系群体 Z003（B73×CML228）对 pv. 抗性进行了数量性状位点（QTL）作图。我们检测到三个 pv. 抗性 QTL。除了抗病 QTL 外，我们还检测到一个耳状颜色的单个 QTL。我们观察到 BLS 严重程度、模式触发免疫反应水平和叶片斑点之间存在显著但较弱的相关性。这些结果将有助于了解 pv. 的抗性和减轻 BLS 对玉米产量的影响。
