Characterization of the defence response to Venturia inaequalis in ‘Honeycrisp’ apple, its ancestors, and progenyReport as inadecuate




Characterization of the defence response to Venturia inaequalis in ‘Honeycrisp’ apple, its ancestors, and progeny - Download this document for free, or read online. Document in PDF available to download.

European Journal of Plant Pathology

, Volume 140, Issue 1, pp 69–81

First Online: 17 May 2014Accepted: 30 April 2014DOI: 10.1007-s10658-014-0444-3

Cite this article as: Clark, M.D., Bus, V.G.M., Luby, J.J. et al. Eur J Plant Pathol 2014 140: 69. doi:10.1007-s10658-014-0444-3

Abstract

The apple cultivar Honeycrisp exhibits genetic resistance to apple scab. The characterization of the macroscopic and microscopic responses on leaves infected by the pathogen Venturia inaequalis is described. The macroscopic resistance reactions observed in ‘Honeycrisp’, its parent ‘Keepsake’, and grandparents ‘Frostbite’ and ‘Northern Spy’ ranged from 0 no reaction to chlorotic flecking, stellate chlorosis, necrotic flecking, and sporulation. No hypersensitive response was observed. The resistance response occurred as early as 7 days post inoculation dpi at the same time that susceptible plants exhibited macroscopic signs of the disease. The resistance reactions were similar in the progeny population of ‘Honeycrisp’ × ‘Twin Bee Gala’, although they were delayed to 10–14 dpi possibly due to variable greenhouse conditions. This population segregated 3 resistant:1 susceptible, which suggests the presence of two genes in ‘Honeycrisp’ and agrees with the finding that different responses within ‘Honeycrisp’ to mixed inoculum are due to differential recognition of pathogen effectors.

KeywordsVenturia inaequalis Apple scab Malus Malus-Venturia Pathosystem  Download fulltext PDF



Author: Matthew D. Clark - Vincent G. M. Bus - James J. Luby - James M. Bradeen

Source: https://link.springer.com/







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