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Host Range of Verticillium isaacii and Verticillium klebahnii from Artichoke, Spinach, and Lettuce. | LitMetric

AI Article Synopsis

  • - Recent research identified two new species of Verticillium, V. isaacii and V. klebahnii, found in California's agricultural soils affecting crops like spinach and lettuce, but their full impact on other important crops is still unclear.
  • - A greenhouse experiment tested these new species along with reference isolates on eight different crops, revealing that most V. isaacii and V. klebahnii isolates were nonpathogenic, except for some pathogenic cases observed in artichoke and strawberry.
  • - Lettuce lines that are resistant to V. dahliae also showed resistance to the pathogenic isolates of V. isaacii and V. klebahnii, suggesting that existing resistance could mitigate potential threats from these new pathogens in

Article Abstract

Verticillium is a genus that includes major vascular wilt pathogens. Recently, multilocus phylogenetic analyses of the genus identified five new species, including Verticillium isaacii and V. klebahnii, both of which occur in agricultural soils in coastal California and have been isolated from asymptomatic and diseased spinach and lettuce plants. Little data are available regarding their pathogenicity and virulence on a broader range of crops important to the region. Four isolates each of V. isaacii and V. klebahnii along with two reference isolates of V. dahliae races 1 and 2 were inoculated on eight crops (artichoke, cauliflower, eggplant, lettuce, pepper, tomato, spinach, and strawberry) in a greenhouse experiment. After 8 weeks, plants were assessed for disease severity to determine the relative host ranges of Verticillium isolates. Additionally, 13 lettuce lines resistant to race 1 and partially resistant to race 2 of V. dahliae were screened against V. isaacii and V. klebahnii to evaluate their responses. Three of four V. isaacii and four of four V. klebahnii isolates tested were nonpathogenic on all crops tested except those indicated below. One V. isaacii isolate caused wilt on artichoke and 'Salinas' lettuce and most isolates of both species caused varying degrees of Verticillium wilt on strawberry. Lettuce lines resistant to V. dahliae race 1 and partially resistant to V. dahliae race 2 also exhibited resistance to all of the isolates of V. isaacii and V. klebahnii. Thus, at least some isolates in the populations of V. isaacii and V. klebahnii have the potential to become significant pathogens of coastal California crops. However, resistance developed against V. dahliae also offers resistance to the pathogenic isolates of both species, at least in lettuce.

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Source
http://dx.doi.org/10.1094/PDIS-12-14-1307-REDOI Listing

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