Xiong Hao, Xing Xiaobin, Liu Muyuan, Zhang Zhaoyu, Wang Qingjun, Zhang Xuemei, Gou Xiangjian, Lu Yanli, Feng Xuanjun
Maize Research Institute, Sichuan Agricultural University, Sichuan, Chengdu, China.
State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan, Chengdu, China.
Front Plant Sci. 2024 Oct 16;15:1461896. doi: 10.3389/fpls.2024.1461896. eCollection 2024.
species are the dominant cause of maize ear rot, but they also inflict serious damage to the roots and stalks. Theoretically, the organ where the host interacts with the pathogen most frequently should exhibit the highest degree of symptom-genotype correlation. Because that symptom-genotype correlation is an indicator reflecting the degree of coevolution between pathogen and its hosts. We wonder which organ is the main battlefield for the antagonism between maize and For this purpose, 43 isolates of were isolated from infected maize ears. and are the two dominant pathogens, accounting for 44% and 30%, respectively. Furthermore, 14 elite maize inbreds were exposed to 43 isolates and the symptoms of ear rot, stalk rot and root rot were investigated. In general, symptoms caused by were significantly more severe than those caused by other species. Surprisingly, the genotype of showed a strong correlation with stalk and root rot, but not with ear rot. Accordingly, our study may provide the first evidence that the stalk and root of maize, rather than the ear, is the main battlefield for the coevolution between maize and .
物种是玉米穗腐病的主要病因，但它们也会对根和茎造成严重损害。从理论上讲，宿主与病原体最频繁相互作用的器官应该表现出最高程度的症状 - 基因型相关性。因为这种症状 - 基因型相关性是反映病原体与其宿主之间协同进化程度的一个指标。我们想知道哪个器官是玉米与之间对抗的主要战场。为此，从受感染的玉米穗中分离出43株分离物。和是两种主要病原体，分别占44%和30%。此外，将14个优良玉米自交系暴露于43株分离物中，并调查穗腐病、茎腐病和根腐病的症状。总体而言，引起的症状明显比其他物种引起的症状更严重。令人惊讶的是，的基因型与茎腐病和根腐病有很强的相关性，但与穗腐病无关。因此，我们的研究可能首次提供证据表明，玉米的茎和根而非穗，是玉米与之间协同进化的主要战场。
