Leaf Spot and Stem Canker of Pistachio Trees Incited by Xanthomonas Strains

IF 1.1 4区农林科学 Q3 PLANT SCIENCES

Journal of Phytopathology Pub Date : 2025-05-19 DOI:10.1111/jph.70078

Maryam Khorasani, Akbar Hosseinipour, Omid Shenavar, Heshmat Rahimian

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引用次数: 0

Abstract

Pistachio (Pistacia vera) is the major and economically most important nut crop in Iran, and the country ranks among the top three global producers, alongside the United States and Turkey. A bacterial leaf spot and stem canker disease has been observed on the seedlings and bearing trees of pistachio in southeastern Iran in recent years. The associated bacteria produced yellow, circular, convex, mucoid colonies on agar media and exhibited phenotypic characteristics typical of the genus Xanthomonas. Based on phenotypic characteristics and multilocus sequence analysis (MLSA) of the gyrB and rpoD gene sequences, the strains were classified into two main groups. The representative isolate of the first group was closely affiliated with X. arboricola and clustered with the pathovars thereof. The isolates of group two displayed their highest affiliation to X. hortorum and clustered with its existing pathovars. All the isolates tested were pathogenic and produced leaf spot and canker on the seedlings of pistachio cultivars and elicited a hypersensitive reaction on Pelargonium × hortorum leaves.

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黄单胞菌诱发开心果叶斑病和茎溃疡病的研究

开心果（开心果）是伊朗经济上最重要的主要坚果作物，该国与美国和土耳其一起跻身全球三大生产国之列。近年来，在伊朗东南部地区的开心果幼苗和结实树上发现了细菌性叶斑病和茎溃疡病。相关细菌在琼脂培养基上产生黄色，圆形，凸状的粘液菌落，并表现出黄单胞菌属的典型表型特征。根据gyrB和rpoD基因序列的表型特征和多位点序列分析（MLSA），将菌株分为两大类群。第一类群的代表分离物与树蛾有密切的亲缘关系，并与树蛾的病原聚类。第2组分离物与hortorum的亲缘关系最高，与现有病原菌聚集在一起。所有分离株均具有致病性，在开心果品种的幼苗上产生叶斑病和溃疡病，并对天竺葵（Pelargonium × hortorum）叶片产生过敏反应。

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来源期刊

Journal of Phytopathology 生物-植物科学

CiteScore

2.90

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Journal of Phytopathology publishes original and review articles on all scientific aspects of applied phytopathology in agricultural and horticultural crops. Preference is given to contributions improving our understanding of the biotic and abiotic determinants of plant diseases, including epidemics and damage potential, as a basis for innovative disease management, modelling and forecasting. This includes practical aspects and the development of methods for disease diagnosis as well as infection bioassays. Studies at the population, organism, physiological, biochemical and molecular genetic level are welcome. The journal scope comprises the pathology and epidemiology of plant diseases caused by microbial pathogens, viruses and nematodes. Accepted papers should advance our conceptual knowledge of plant diseases, rather than presenting descriptive or screening data unrelated to phytopathological mechanisms or functions. Results from unrepeated experimental conditions or data with no or inappropriate statistical processing will not be considered. Authors are encouraged to look at past issues to ensure adherence to the standards of the journal.