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Host range, transmitting vector, and damage characteristics of Mikania micrantha wilt virus.

WANG Rui-long1,2,3, CHEN Ying1,2,3, ZHANG Hui1,2,3, GUAN Ao-mei1,2,3, WANG Zi-ye1,2,3, GONG Xiao1,2,3, YIN Yi1,2,3, ZENG Ren-sen1,2,3**   

  1. (1State Key Laboratory for Conservation and Utilization of Subtropical Agrobioresources, South China Agricultural University, Guangzhou 510642, China; 2Key Laboratory of Tropical Agroenvironment, Ministry of Agriculture, Guangzhou 510642, China; 3Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, Guangzhou 510642, China)
  • Online:2013-01-10 Published:2013-01-10

Abstract: Mikania micrantha H.B.K. is an important invasive alien plant in South China. In this study, a virus named Mikania micrantha wilt virus (MMWV) was isolated from the invasive plant in the field, and a greenhouse experiment was conducted to inoculate the virus on 27 plant species of 9 families. A total of 12 plant species belonging to 6 families were infected. The electron microscopy observation revealed that the MMWV particle was spherical, with a diameter of about 30 nm. The MMWV could be transmitted by Myzus persicae in a non-persistent manner. Thirty days after infection by MMWV, the shoot height and the fresh weights of leaves, stems, and roots of M. micrantha were reduced significantly by 75.3%, 91.6%, 79.5%, and 75.6%, respectively, as compared to the control. The infected M. micrantha plants showed wilt, crimpled, and malformed symptoms under field conditions. Under both laboratory and field conditions, the MMWV inhibited the growth of M. micrantha efficiently. The feasibility of using the MMWV to control the invasion of M. micrantha would be worthy to be explored further.