<i>Colletotrichum truncatum</i>—A New Etiological Anthracnose Agent of Sword Bean (<i>Canavalia gladiata</i>) in Southwestern China
Min Shi,
Shi-Ming Xue,
Mei-Yan Zhang,
Shi-Ping Li,
Bi-Zhi Huang,
Qi Huang,
Qiong-Bo Liu,
Xiang-Long Liao,
Yan-Zhong Li
Affiliations
Min Shi
State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Ministry of Agriculture and Rural Affairs, Engineering Research Center of Grassland Industry, Ministry of Education, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China
Shi-Ming Xue
Academe of Grassland and Animal Science, Kunming 650212, China
Mei-Yan Zhang
Academe of Grassland and Animal Science, Kunming 650212, China
Shi-Ping Li
Academe of Grassland and Animal Science, Kunming 650212, China
Bi-Zhi Huang
Academe of Grassland and Animal Science, Kunming 650212, China
Qi Huang
Forage and Fodder Station of Qujing, Qujing 655000, China
Qiong-Bo Liu
Forage and Fodder Station of Qujing, Qujing 655000, China
Xiang-Long Liao
Academe of Grassland and Animal Science, Kunming 650212, China
Yan-Zhong Li
State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Ministry of Agriculture and Rural Affairs, Engineering Research Center of Grassland Industry, Ministry of Education, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730000, China
Anthracnose is a disease caused by Colletotrichum species. They are well known as major plant pathogens, and a black stem disease, specifically caused by Colletotrichum truncatum and primarily infecting sword bean (Canavalia gladiata), was observed in the Yunnan province, China. To aid disease management and to determine pathogenic characteristics, the species causing the leaf spot disease of hairy vetch was verified as C. truncatum. A sequence analysis of the ITS, ACT, GAPDH, and HIS3 genes was conducted, as well as morphological and cultural characteristics, to identify this Colletotrichum species, which has curved conidia. C. truncatum isolates from sword bean formed a distinctive group among Colletotrichum species, including those that infect other forage and field crops. Artificially inoculated sword bean seedlings showed typical symptoms of anthracnose, which were similar to field observations. To the best of our knowledge, this is the first report of C. truncatum causing black stem disease on sword beans in China.
