Population structure of Venturia inaequalis, a hemibiotrophic fungus, under different host resistance specificities in the Kashmir valley

Dar, Mehraj U. Din; Padder, Bilal A.; Ahmad, Mushtaq; Sofi, T. A.; Mir, A. A.; Nabi, Asha; Shah, M. G.

doi:10.1007/s00203-020-01950-8

Cited by 4 publications

(2 citation statements)

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“…Most studies suggested weak differentiation between V. inaequalis populations despite being separated by large geographic distances [44][45][46][47][48][49][50], with a few exceptions where mountainous or coastal regions with vastly differing climate conditions were also included in the study [51,52]. Besides environmental factors, host-specialization is among the major evolutionary forces guiding population differentiation.…”

Section: Discussionmentioning

confidence: 99%

“…It has been suggested that the Rvi6 virulent population diverged from non-virulent isolates 8000 to 50,000 years ago and hybridization is only happening recently in commercial orchards [56]. It has also been proposed that Rvi1 host cultivars might have caused a similar split in the pathogen population in Kashmir, India [45]. Still, unlike Rvi6, neither Rvi1 nor Rvi17 in the host seem to affect the V. inaequalis population structure [48].…”

Section: Discussionmentioning

confidence: 99%

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Strong Genetic Differentiation between Generalist Populations of Venturia inaequalis and Populations from Partially Resistant Apple Cultivars Carrying Rvi3 or Rvi5

et al. 2022

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The ascomycete fungus Venturia inaequalis causes scab disease, a major problem in apple production. The utilization of resistant cultivars is hindered by emerging new pathogen races, which erode their resistance. Increasing our knowledge on the population genetic processes of the fungus can contribute to the development of resistance gene deployment strategies and more durable resistance. We investigated the effect of four scab race indicator cultivars, ‘Gala’ (no R-gene), ‘Golden Delicious’ (Rvi1), ‘Geneva’ (Rvi3, complex), and OR45t132 (Rvi5), on the V. inaequalis population genetic structure and diversity. Sixty-six monosporic fungal isolates from the four cultivars were genotyped with seven simple sequence repeat primers. Furthermore, the partial resistance of the indicators and the pathogenicity profile of the conidia from each host were assessed. The genetic diversity and structure of the investigated V. inaequalis subpopulations correspond to the partial resistance of the original hosts as well as the subpopulations’ pathogenicity profiles. Indicators carrying Rvi3 and Rvi5 had strongly diverged and specialized V. inaequalis populations on them and fewer symptoms on the field. In line with the complete breakdown of the Rvi1 gene, the population from ‘Golden Delicious’ did not segregate from the susceptible ‘Gala’, and virulence towards Rvi1 was present in all subpopulations.

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