Sensitivity of Hevea brasiliensis clones to isolates representing distinct races of the Corynespora cassiicola pathogen

IF 1.1 4区 农林科学 Q3 PLANT SCIENCES Journal of Phytopathology Pub Date : 2024-06-18 DOI:10.1111/jph.13342
Mitha Justine, Gincy P. Thottathil, Li Ying Chang, Xin Jie Lui, Urwashi Pushpak Kamerkar, Kumar Sudesh
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Abstract

Corynespora leaf fall disease caused by the fungus Corynespora cassiicola is a major leaf disease of Hevea brasiliensis, the commercial source of natural rubber. Different clones of H. brasiliensis show varying levels of sensitivity towards different strains of C. cassiicola. The genetic mechanism behind the differential sensitivity of H. brasiliensis clones has to be identified in order to develop clones resistant to wider range of C. cassiicola strains. The available information on the sensitivity of H. brasiliensis clones is based on the observation of natural infection or infection of detached leaves. In the present study, the sensitivity of seven H. brasiliensis clones towards two strains of C. cassiicola belonging to two different races was determined using a more precise method by artificial infection of the plants under controlled conditions. Strain CLN 16 was found to be more virulent compared with CSB 16, as it induced more severe symptoms in a shorter period. Among the four different stages of leaves, Stage II leaves with copper brown to apple green colour showed higher sensitivity to both strains followed by Stage III leaves with apple green appearance. Among the clones, RRIM 600 had a higher susceptibility towards CSB 16; however, it was the most resistant clone towards CLN 16. Clone PB 350 showed the highest susceptibility towards CLN 16 whereas RRIM 928 showed the highest resistance towards CSB 16. The present study provides a platform for further studies leading to the development of H. brasiliensis clones with resistance towards wider range of C. cassiicola strains.

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巴西红豆杉(Hevea brasiliensis)克隆对代表 Corynespora cassiicola 病原体不同种族的分离物的敏感性
由真菌 Corynespora cassiicola 引起的 Corynespora 落叶病是巴西橡胶树(天然橡胶的商业来源)的一种主要叶病。不同的 H. brasiliensis 克隆对不同的 C. cassiicola 菌株表现出不同程度的敏感性。必须确定 H. brasiliensis 克隆不同敏感性背后的遗传机制,以便开发出能抵抗更多 C. cassiicola 菌株的克隆。现有的关于 H. brasiliensis 克隆敏感性的信息都是基于对自然感染或分离叶片感染的观察。在本研究中,采用了一种更精确的方法,在受控条件下对植物进行人工感染,从而确定了七种 H. brasiliensis 克隆对属于两个不同种族的两种 C. cassiicola 菌株的敏感性。与 CSB 16 株系相比,CLN 16 株系的毒力更强,因为它能在更短的时间内诱发更严重的症状。在四个不同阶段的叶片中,铜棕色至苹果绿色的第二阶段叶片对这两种菌株的敏感性较高,其次是苹果绿色的第三阶段叶片。在克隆中,RRIM 600 对 CSB 16 的敏感性较高,但对 CLN 16 的抗性最强。克隆 PB 350 对 CLN 16 的敏感性最高,而 RRIM 928 对 CSB 16 的抗性最高。本研究为进一步研究开发对更多 C. cassiicola 菌株具有抗性的 H. brasiliensis 克隆提供了一个平台。
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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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