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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (1): 126-137.DOI: 10.11686/cyxb2023092

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Detection of AMV pathogen of alfalfa virus diseases with different symptom types and its host ranges

Jian-ling ZHOU(), Qiao-lan LIANG(), Lie-xin WEI, Qi-yu ZHOU, Long TIAN, Ying-e CHEN, Cun-ying WANG, Guo-yin ZHANG   

  1. Biocontrol Engineering Laboratory of Crop Diseases and Pests of Gansu Province,College of Plant Protection,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2023-04-02 Revised:2023-05-10 Online:2024-01-20 Published:2023-11-23
  • Contact: Qiao-lan LIANG

Abstract:

In this study, the level of alfalfa mosaic virus (AMV) and leaf chlorophyll contents in field-grown alfalfa (Medicago sativa) plants with different categories of AMV symptoms were assessed, and a test of the plant species host range of AMV was conducted. Chlorophyll content was determined by an acetone-ethanol extraction method, and AMV was quantified by a double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) method. The pathogenicity of AMV to 32 plant species in nine botanical families was determined for purified virus extract from plants with different symptom types. Four symptom categories of AMV disease were investigated: light mosaic, heavy mosaic, leaf edge chlorosis and yellowing and leaf deformity with leaf-wrinkling and dwarfing. There was a positive correlation between chlorophyll content and AMV content and symptom expression. For the most severe AMV symptom manifestation involving leaf deformation, wrinkling and dwarfing, the chlorophyll a, b, and total chlorophyll content was more than 58% lower than the control, and the carotenoid content was 134.06% higher than the control. The highest AMV content was 252.96 pg·mL-1. The host range determination showed that purified AMV could infect 27 plant species in 7 families, with the strongest pathogenicity to Cucurbita pepo. In this species, the symptoms were local withered spots, and the concentration of AMV in plant extract at 30 days after inoculation was 316.19 pg·mL-1.

Key words: alfalfa, viral disease, alfalfa mosaic virus, host plants, chlorophyll, pathogenicity, symptom