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西南印度洋地区番茄和辣椒细菌性斑点病致病黄单胞菌菌株的遗传与病理多样性

Genetic and Pathological Diversity Among Xanthomonas Strains Responsible for Bacterial Spot on Tomato and Pepper in the Southwest Indian Ocean Region.

作者信息

Hamza A A, Robène-Soustrade I, Jouen E, Gagnevin L, Lefeuvre P, Chiroleu F, Pruvost O

机构信息

Research Plant Pathologists, 97410 Saint Pierre, La Réunion, France.

Statistician, CIRAD, UMR Peuplements Végétaux et Bioagresseurs en Milieu Tropical CIRAD-Université de la Réunion, Pôle de Protection des Plantes, 7, chemin de l'Irat, France.

出版信息

Plant Dis. 2010 Aug;94(8):993-999. doi: 10.1094/PDIS-94-8-0993.

Abstract

Bacterial spot of tomato and pepper, a major problem in tropical climates, can be caused by several Xanthomonas genospecies. We examined the genetic and pathological diversity of a collection of 72 strains from the southwest Indian Ocean region as part of a regional research and development program to update inventories of agricultural pests and pathogens. Xanthomonas euvesicatoria, X. perforans, X. gardneri, and X. vesicatoria were identified in our strain collection. The identification of strains at the species level was consistently achieved by amplified fragment length polymorphism (AFLP) and multilocus sequence analysis (MLSA). Overall, X. euvesicatoria was the species recovered prevalently. MLSA data based on four housekeeping genes identified two to three sequence types per genospecies. It suggested that sequence variations primarily consisted of synonymous mutations, although a recombination event spanning several hundred nucleotides was detected for some strains of X. euvesicatoria on the atpD gene coding for the F1-F0-ATPase β subunit. The pathogenicity of strains was consistent with data found in the literature. Some pathological variations were primarily observed among strains identified as X. euvesicatoria. This study provides the first ever comprehensive description of the status of Xanthomonas species that cause bacterial spot of tomato and pepper in the southwest Indian Ocean region.

摘要

番茄和辣椒的细菌性斑点病是热带气候下的一个主要问题,可由几种黄单胞菌属基因型引起。作为更新农业害虫和病原体清单的区域研发计划的一部分,我们研究了来自印度洋西南部地区的72株菌株的遗传和病理多样性。在我们的菌株收集中鉴定出了丁香假单胞菌、穿孔假单胞菌、加德纳氏假单胞菌和疮痂假单胞菌。通过扩增片段长度多态性(AFLP)和多位点序列分析(MLSA),始终能够在物种水平上鉴定菌株。总体而言,丁香假单胞菌是最常见的物种。基于四个管家基因的MLSA数据确定每个基因型有两到三种序列类型。这表明序列变异主要由同义突变组成,尽管在编码F1-F0-ATP酶β亚基的atpD基因上,检测到一些丁香假单胞菌菌株存在跨越数百个核苷酸的重组事件。菌株的致病性与文献中的数据一致。一些病理变异主要在鉴定为丁香假单胞菌的菌株中观察到。本研究首次全面描述了印度洋西南部地区引起番茄和辣椒细菌性斑点病的黄单胞菌属物种的状况。

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