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Varieties with a high level of resistance provide an opportunity to manage root rot caused by Rhizoctonia solani in alfalfa
European Journal of Plant Pathology ( IF 1.8 ) Pub Date : 2021-04-24 , DOI: 10.1007/s10658-021-02287-8
Caixia Zhang , Shuting Yu , Hui Tian , Zi Wang , Binhua Yu , Lisong Ma , Zhibiao Nan , Xiangling Fang

Rhizoctonia solani is one of the major fungal pathogens associated with root rot in alfalfa that severely limits commercial alfalfa production worldwide. Host resistance is considered the most cost-effective and sustainable way to manage diseases caused by this pathogen. This study aimed to determine whether any host resistances to R. solani exist among a wide-ranging alfalfa collection and whether host resistances were associated with a specific geographic origin. We found a large variation in disease responses among the 68 alfalfa varieties, with the range of disease indices of shoots from 23 to 94% and roots from 31 to 98% as well as reductions in dry weight of shoots from 35 to 96% and roots from 2 to 99%. Among these, three varieties (Gannong 9, Trifecta and Common), originating from three different countries, displayed a high level of resistance, with disease indices of shoots and roots as well as reductions in dry weight of shoots and roots being all ≤40%. Hierarchical clustering and principal component analysis revealed three main groups of disease responses existed among varieties, with five varieties (7%) showing resistance, 15 varieties (22%) being moderately resistant and the remaining ones exhibiting susceptibility. Besides, varieties with a similar disease response were associated with various geographic origins. This study provides valuable resistance sources for breeding programs to develop alfalfa varieties with improved resistance to R. solani, and for facilitating the identification of molecular mechanisms underlying the resistant varieties to this pathogen.



中文翻译:

具有高抗性的品种提供了管理由苜蓿根核菌引起的根腐病的机会

立枯丝核菌是与苜蓿根腐病相关的主要真菌病原体之一,严重限制了全球范围内的商业苜蓿生产。宿主抗性被认为是管理由这种病原体引起的疾病的最具成本效益和可持续的方法。本研究旨在确定是否对R. solani 有任何宿主抗性存在于广泛的苜蓿收藏中以及宿主抗性是否与特定的地理来源有关。我们发现 68 个苜蓿品种的病害反应差异很大,枝条的病害指数从 23% 到 94% 和根从 31% 到 98% 的范围以及枝条干重从 35% 到 96% 和根的减少从 2% 到 99%。其中,来自三个不同国家的三个品种(干农9、三连、普通)表现出较高的抗性,枝条和根部的病害指数以及枝条和根部干重的下降均≤40%。 . 层次聚类和主成分分析显示,品种之间存在三类主要的疾病反应,其中五个品种 (7%) 表现出抗性,15 个品种 (22%) 具有中等抗性,其余品种表现出易感性。此外,具有相似疾病反应的品种与不同的地理起源有关。这项研究为育种计划提供了宝贵的抗性来源,以开发具有改良抗性的苜蓿品种。R. solani,以及促进鉴定抗性品种对这种病原体的分子机制。

更新日期:2021-04-24
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