First evidence of Corynespora cassiicola-induced disease in Chia: A new challenge for Indian Chia cultivation

IF 3.3 3区农林科学 Q2 PLANT SCIENCES

Physiological and Molecular Plant Pathology Pub Date : 2025-09-04 DOI:10.1016/j.pmpp.2025.102917

H. Manjunatha , Geetha Govind , C. Channakeshava , A.S. Shashi Kiran , Prakash Koler

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Abstract

Chia (Salvia hispanica L.) is a nutrient-rich crop recently introduced to India to diversify diets and improve nutrition. In August 2020, a severe foliar disease was observed in chia fields in Karnataka, South India, with over 50 % incidence across 1.5 ha, causing necrotic leaf spots, inflorescence blight, and premature defoliation. This study aimed to identify the causal pathogen and confirm its pathogenicity. The fungus isolated from diseased tissues was identified as Corynespora cassiicola based on morphological characteristics and multi-locus sequence analysis (ITS, TEF-1α, and β-tubulin). Pathogenicity tests, using detached leaf and whole-plant assays, reproduced the symptoms as observed in the field, and the pathogen was re-isolated, fulfilling Koch's postulates. To our knowledge, this is the first confirmed report of C. cassiicola infecting chia in India. The occurrence of this pathogen poses a potential threat to chia production, highlighting the need for research on its epidemiology and integrated disease management strategies.

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中国炭疽病的首个证据：对印度中国种植的新挑战

鼠药（Salvia hispanica L.）是一种营养丰富的作物，最近被引入印度，以多样化饮食和改善营养。2020年8月，在印度南部卡纳塔克邦的奇亚田里发现了一种严重的叶面病害，在1.5公顷的土地上发病率超过50%，造成叶斑坏死、花序枯萎和过早落叶。本研究旨在鉴定病原菌，确认其致病性。根据形态学特征和ITS、TEF-1α和β-微管蛋白的多位点序列分析，鉴定该真菌为cassiicola Corynespora。致病性测试，使用离体叶片和整株测定，再现了在田间观察到的症状，病原体被重新分离，满足了科赫的假设。据我们所知，这是印度首次确诊的中国感染卡氏杆菌的报告。该病原菌的发生对中国的生产构成潜在威胁，强调了对其流行病学和综合疾病管理策略研究的必要性。

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来源期刊

Physiological and Molecular Plant Pathology 生物-植物科学

CiteScore

4.30

自引率

7.40%

发文量

130

审稿时长

38 days

期刊介绍： Physiological and Molecular Plant Pathology provides an International forum for original research papers, reviews, and commentaries on all aspects of the molecular biology, biochemistry, physiology, histology and cytology, genetics and evolution of plant-microbe interactions. Papers on all kinds of infective pathogen, including viruses, prokaryotes, fungi, and nematodes, as well as mutualistic organisms such as Rhizobium and mycorrhyzal fungi, are acceptable as long as they have a bearing on the interaction between pathogen and plant.