First Report of Colletotrichum siamense Causing Leaf Anthracnose on Indigofera tinctoria in India

IF 1.2 4区农林科学 Q3 PLANT SCIENCES

Journal of Phytopathology Pub Date : 2026-08-08 DOI:10.1111/jph.70374

Arnab De, Goutam Mondal, Ankur Mukhopadhyay, Soumik Mukherjee, Dibyendu Ghosh, Pujan Mandal, Rabinath Murmu

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引用次数: 0

Abstract

During November–January 2023–2024, severe anthracnose symptoms were observed on indigo (Indigofera tinctoria) plants in Kalyani, West Bengal, India, causing irregular necrotic lesions on leaves, pods and apical branches. A morphologically uniform fungal isolate (ITNK-4) was consistently recovered from symptomatic tissues. On Potato Dextrose Agar, colonies exhibited whitish-grey, woolly aerial mycelium with hyaline, smooth-walled, cylindrical conidia and melanised appressoria. Based on these morphological characteristics and a multilocus maximum-likelihood phylogenetic analysis of the internal transcribed spacer (ITS), beta-tubulin (TUB2) and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) regions, the isolate was identified as Colletotrichum siamense. Pathogenicity was confirmed by artificially inoculating healthy I. tinctoria leaves with a 14-day-old fungal spore suspension, resulting in symptoms identical to those observed in the field, thereby fulfilling Koch's postulates. To our knowledge, this is the first molecularly confirmed report of C. siamense causing leaf anthracnose on I. tinctoria in India. Given the high economic value of I. tinctoria in natural dye production and traditional medicine, the emergence of this pathogen poses a newly characterised threat to its commercial cultivation and warrants further epidemiological monitoring.

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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.