First Report of Rhizoctonia solani AG-4 HGI Causing Corky Cracks on Potato Tubers in Mauritius

IF 1.1 4区 农林科学 Q3 PLANT SCIENCES Journal of Phytopathology Pub Date : 2024-10-22 DOI:10.1111/jph.13414
Sandhya Devi Takooree, Hudaa Neetoo, Mira Vojvodić, Aleksandra Bulajić, Vijayanti Mala Ranghoo-Sanmukhiya
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Abstract

Potato (Solanum tuberosum L.) is of great economic importance for Mauritius. During a disease survey carried out in a field in one of the major potato-growing regions of Mauritius, corky cracked lesions with halo and mycelial growth were observed on the skin surfaces of around 45% of tubers. The suspected fungus from the affected areas was isolated on amended potato dextrose agar and after 7 days, several fast-growing, pale brown Rhizoctonia-like colonies with a few sclerotia were observed. Additionally, microscopic analysis revealed some cells being multinucleate, forming hyphal branching at right angles with slight constriction together with septum near the branch base. Pathogenicity tests confirmed development of the same symptoms on potato tubers and the causal agent was reisolated successfully. Sequence analysis of the ITS region of representative isolate P114 amplified using ITS1F/ITS4 primers showed that it was identical to several isolates of multinucleate Rhizoctonia solani AG-4 HGI, and neighbour-joining phylogenetic analyses confirmed the identification. To our knowledge, this is the first report of R. solani AG-4 HGI-infecting potato tubers and causing corky cracks in Mauritius.

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毛里求斯首次报告 Rhizoctonia solani AG-4 HGI 在马铃薯块茎上造成木栓质裂纹
马铃薯(Solanum tuberosum L.)对毛里求斯具有重要的经济意义。在毛里求斯一个主要马铃薯种植区的田间进行病害调查期间,在大约 45% 的块茎表皮上观察到了木栓状裂纹病变,并伴有光晕和菌丝生长。从受害部位分离出的疑似真菌被置于马铃薯葡萄糖琼脂中,7 天后,观察到几个快速生长的淡褐色根瘤菌样菌落,并带有少量硬菌。此外,显微镜分析表明,一些细胞为多核细胞,形成直角分枝,分枝基部附近有轻微缢缩和隔膜。致病性试验证实,马铃薯块茎上也出现了同样的症状,并成功地重新分离出了病原菌。使用 ITS1F/ITS4 引物扩增的代表性分离物 P114 的 ITS 区域的序列分析表明,它与多核根瘤菌 AG-4 HGI 的几个分离物相同,邻接系统发育分析证实了这一鉴定。据我们所知,这是毛里求斯首次报道 R. solani AG-4 HGI 感染马铃薯块茎并导致木栓化裂纹。
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来源期刊
Journal of Phytopathology
Journal of Phytopathology 生物-植物科学
CiteScore
2.90
自引率
0.00%
发文量
88
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.
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