Identification of <i>Venturia inaequalis</i> Races in Morioka, Japan and Identification of a Quantitative Trait Locus Associated with Resistance to Apple Scab in ‘Akane’ Apples

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  • Moriya Shigeki
    Apple Research Station, Institute of Fruit Tree and Tea Science, NARO
  • Goto Satoshi
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Kubo Takashi
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Kunihisa Miyuki
    Institute of Fruit Tree and Tea Science, NARO
  • Tazawa Junko
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Kudo Tsuyoshi
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Kasai Satoshi
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Kudo Haruka
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Okada Kazuma
    Apple Research Station, Institute of Fruit Tree and Tea Science, NARO
  • Yamamoto Toshiya
    Institute of Fruit Tree and Tea Science, NARO
  • Fukazawa-Akada Tomoko
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Hatsuyama Yoshimichi
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Abe Kazuyuki
    Apple Research Station, Institute of Fruit Tree and Tea Science, NARO

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Other Title
  • 岩手県盛岡市に分布するリンゴ黒星病菌（<i>Venturia inaequalis</i>）レース同定の試みおよびリンゴ ‘あかね’ のリンゴ黒星病抵抗性に関与するQTLの同定
  • 岩手県盛岡市に分布するリンゴ黒星病菌(Venturia inaequalis)レース同定の試みおよびリンゴ'あかね'のリンゴ黒星病抵抗性に関与するQTLの同定
  • イワテケン モリオカシ ニ ブンプ スル リンゴ クロボシ ビョウキン(Venturia inaequalis)レース ドウテイ ノ ココロミ オヨビ リンゴ'アカネ'ノ リンゴ クロホシビョウ テイコウセイ ニ カンヨ スル QTL ノ ドウテイ

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<p>Apple scab, which is caused by Venturia inaequalis (Cooke) G. Wint., is a destructive disease that affects apples (Malus × domestica Borkh.). To develop an approach to breeding apples for scab resistance, race distribution of V. inaequalis in Morioka, Japan and genetic factors affecting partial scab resistance observed on ‘Akane’ were assessed. An inoculation test using several differential hosts suggested that race 1 of V. inaequalis was the predominant race in Morioka, Japan. To characterize the genetic profile of ‘Akane’ resistance, quantitative trait locus (QTL) analyses that employed two years of natural scab infection scores in a fungicide-free orchard in Kuroishi, Aomori, Japan were performed using an F1 population derived from the ‘Orin’ × ‘Akane’ cross. A QTL allele that explained 20% of the phenotypic variance in scab resistance was detected on chromosome 17 of ‘Akane’. In the middle region of chromosome 17 of ‘Orin’ and in very close proximity to the ‘Akane’ QTL, a weak QTL allele was also detected, which explained 5% of the phenotypic variance observed. We considered that these effects were caused by alleles of the identical QTL. Haplotyping analysis indicated that this QTL resistance allele from ‘Akane’ originated from ‘Worcester Pearmain’.</p>

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