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Molecular characterization and pathogenicity of a carrot (Daucus carota) infecting begomovirus and associated betasatellite from India. | LitMetric

AI Article Synopsis

  • - The study identifies begomovirus infection in carrots, characterized by yellow mosaic patterns and shortened leaf petioles, leading to the discovery of the ageratum enation virus (AEV), specifically the carrot variant (AEV-Car) and the variant from nearby ageratum plants (AEV-Age).
  • - Ageratum yellow leaf curl betasatellite (AYLCB) was also found in both infected carrots and ageratum, indicating a close interaction between the virus and its satellite.
  • - When both AEV variants and AYLCB were introduced into various plants, they exhibited stronger yellow mosaic and curling symptoms, suggesting that the combination of these viruses leads to increased viral load and more severe disease symptoms.

Article Abstract

The yellow mosaic pattern and shortening of leaf petiole are common disease symptoms associated with begomovirus infection in carrot. DNA from field infected carrot leaves was analyzed by rolling circle amplification and sequencing. The results established the presence of ageratum enation virus (AEV), which is referred to here as ageratum enation virus-carrot (AEV-Car). Symptomatic ageratum (Ageratum conyzoides) plants, growing adjacent to the carrot fields, also showed the presence of AEV (AEV-Age). Ageratum yellow leaf curl betasatellite (AYLCB) was also detected in the AEV infected carrot and ageratum samples. AEV-Car and AEV-Age are 95-97% identical in their DNA sequences, represent groups of isolates from the respective plant hosts (carrot and ageratum). Agroinoculation using infectious clones of AEV-Car plus AYLCB or AEV-Age plus AYLCB in carrot, ageratum, tobacco (Nicotiana tabacum) and tomato (Solanum lycopersicum) produced yellow mosaic and curling symptoms in leaves of inoculated plants. Agroinoculation of the two isolates together, along with the betasatellite (AEV-Car plus AEV-Age plus AYLCB) resulted in the enhancement of symptoms in comparison to the plants inoculated with single isolate. Plants with more severe symptoms showed a higher level of viral DNA accumulation, suggesting synergistic interactions between the two isolates of AEV.

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Source
http://dx.doi.org/10.1016/j.virusres.2013.10.010DOI Listing

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