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首页> 外文期刊>Journal of Agriculture of the University of Puerto Rico >Identification of soil-borne pathogens in a common bean root rot nursery in Isabela, Puerto Rico
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Identification of soil-borne pathogens in a common bean root rot nursery in Isabela, Puerto Rico

机译：在波多黎各伊莎贝拉的一个普通豆根腐烂苗圃中鉴定土壤传播的病原体

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摘要

Limited research has been completed on the root rot complex of common bean (Phaseolus vulgaris L.) in the Caribbean, while yield losses of over 50% due to root rot disease have been reported worldwide. In this study, the predominant root rot pathogensin a 43-year old common bean root rot nursery in Isabela, Puerto Rico, were identified using standard and molecular diagnostic techniques over four planting periods. Evaluations were conducted from Dec. 2009 to Sept. 2012. The most prevalent fungi identified were Fusarium solani, causal agent of, Fusarium root rot; Macrophomina phaseolina, causal agent of charcoal rot; and Sclerotium rolfsii, which causes southern blight. Pythium aphanidermathum and Pythium graminicola were also identified during the 2012 evaluation, which cause damping-off and root rot. Other fungi, such as Rhizoctonia solani, were isolated from root and hypocotyl tissue with less frequency. The incidence of the predominant soil-borne pathogens was largely correlated across seasons.Low nitrogen levels in the soil, and low nitrogen, phosphorus, potassium, and magnesium in leaf tissue were identified in the nursery and have been achieved through no application of fertilizer. Knowledge of the prevalence of soil borne pathogens and fertility conditions will be used for targeting the selection of breeding materials at the Isabela root rot nursery and in other testing locations.
机译：对加勒比地区普通豆（菜豆）的根腐复合物的研究尚未完成，而全世界已有报道称根腐病造成的产量损失超过50％。在这项研究中，使用标准和分子诊断技术在四个种植期内确定了波多黎各伊莎贝拉一个43岁的普通豆腐烂苗圃中的主要腐烂病原体。从2009年12月至2012年9月进行了评估。鉴定出的最普遍的真菌是茄枯萎病的致病菌solani solani。菜豆（Macrophomina phaseolina），木炭腐烂的病原体;和导致南部疫病的菌核病菌。在2012年的评估中还鉴定出了腐霉菌腐霉和重腐霉菌，导致衰减和根腐病。从根和下胚轴组织中分离出频率较低的其他真菌，如茄红枯菌。主要的土壤传播病原体的发生率在各个季节之间存在很大的相关性。在苗圃中，土壤中的氮含量较低，叶片组织中的氮，磷，钾和镁含量较低，这是通过不施肥实现的。了解土壤传播的病原体的流行情况和生育条件将用于在伊莎贝拉根腐苗圃和其他测试地点选择育种材料。

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