Screening for resistance to ripe rot caused by <i>Colletotrichum acutatum</i> in grape germplasm

Authors

  • M. Shiraishi
  • M. Koide
  • H. Itamura
  • M. Yamada
  • N. Mitani
  • T. Ueno
  • R. Nakaune
  • M. Nakano

DOI:

https://doi.org/10.5073/vitis.2007.46.196-200

Keywords:

breeding material, Colletotrichum acutatum, grape, muscadine, ripe rot resistant

Abstract

We screened 235 Vitis and six Muscadinia grapevine cultivars and selections conserved at the National Institute of Fruit Tree Science in Japan for resistance to grape ripe rot, caused by Colletotrichum acutatum Simmonds ex Simmonds. This fungus is insensitive to fungicides such as benomyl, diethofencarb, and iminoctadine-triacetate. We evaluated the disease resistance of nearly ripe berries from each cultivar and selection by artificial inoculation with C. acutatum. Analysis of variance of 20 cultivars and selections indicated that the genotype had a significant effect but that the year had no significant effect on the percentage of diseased berries. Genetic variance explained 85 % of total variance. Each cultivar or selection was classified into one of the following four classes based on its level of resistance to ripe rot: 50 highly resistant (≤ 20 % affected), 37 resistant (21- 40 %), 48 susceptible (41- 60 %), and 106 highly susceptible (≥ 61 %). Of the highly resistant cultivars and selections, we consider a diploid named 676-64 to be promising material for ripe rot resistant table grape breeding.

 

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Published

2015-04-14

Issue

Vol. 46 No. 4 (2007): Vitis

Section

Article

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