Abstract
Panax notoginseng is a traditional Chinese medicinal plant. Root rot of P. notoginseng is one of the most serious diseases affecting P. notoginseng growth and causes wilted leaves, fewer lateral roots and rotten roots. Root rot is a soil-borne disease, and mainly occurs from June to August in Yunnan Province when the temperatures are high and the air is humid. In this study, the endophytic fungal genus Fusarium isolate E-2018.1.22-#3.2 was obtained from a P. notoginseng embryo. Fusarium isolate E-2018.1.22-#3.2 was identified as Fusarium striatum based on morphological characteristics and molecular analysis. The fungus was found to have conidiophores and macroconidia, and its ITS, LSU and TEF-1α genes shared 100%, 99.2% and 99% identities with the homologous genes of Fusarium striatum, respectively. Isolate F. striatum E-2018.1.22-#3.2 can cause root rot symptoms, including black, soft roots, fewer lateral roots and leaf wilt, in 93% of the experimental P. notoginseng plants, and could be re-isolated, fulfilling Koch’s postulates. When the P. notoginseng plants were treated with the fungicide pyraclostrobin, isolate F. striatum E-2018.1.22-#3.2 was unable to cause root rot. We have therefore demonstrated that F. striatum E-2018.1.22-#3.2 is able to cause root rot disease in P. notoginseng. This is the first report of root rot disease caused by F. striatum on P. notoginseng in China.
Highlights
After the isolate E-2018.1.22-#3.2 had been grown on potato dextrose agar (PDA) medium for 30 days, it produced typical conidiophores and macroconidia (Figs. 1D–1F) of the genus Fusarium [9]
We found that the F. striatum E-2018.1.22-#3.2 was able to cause root rot disease in P. notoginseng in Yunnan, China
The F. striatum E-2018.1.22#3.2 was isolated from the embryos of P. notoginseng seedlings and could be an endophytic fungus
Summary
H. Chen belongs to the family Araliaceae. The roots of P. notoginseng are used as traditional medicine in China, and dried flower buds of P. notoginseng function as a medicine or tea [1]. Root rot caused by pathogenic fungi is a serious disease of P. notoginseng, and affects growth [2]. The P. notoginseng seedlings grow in shade, with soft, permeable soil. The weather in summer is hot, humid and rainy in most of the regions in Yunnan Province where P. notoginseng is cultivated, which include
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