ブドウ'安芸クイーン'の着色実態および環状はく皮と着果量の軽減による着色改善(栽培管理・作型)  [in Japanese] Coloration of 'Aki Queen' Grapes in Different Production Areas and Improvement of Coloration by Girdling and Cluster Thinning(Crop Production & Cropping Type)  [in Japanese]

広島県内各地における'安芸クイーン'の着色実態と気温との関係を明らかにするため,栽培条件の異なる7園について,ブドウ'安芸クイーン'の着色実態を2001年に調査した.また,2005年に栽培条件の異なる着色不良園3園において環状はく皮処理および着果量の軽減による着色改善を試みた.着色は園地により大きく異なり,カラーチャート値(0〜5段階)で0.2〜4.5となった.樹齢や栽培方法が異なったにもかかわらず,着色と糖度および着色開始後8〜21日における20〜25℃に遭遇した時間との間に有意な正の相関が認められた.また,高温条件下でも着果量を減らし,環状はく皮処理することにより,着色および糖度が向上したか,新梢生育の旺盛な園では,着色改善効果が小さく,気温や糖度以外にも着色阻害要因かあることが示唆された.

To clarify the relation between coloration of grape berry skins and temperature in Hiroshima, skin coloration, temperatures as well as berry characteristics and cultutivation methods were measured among 7 vineyards of 'Aki Queen' grape (Vitis labrusca L. × V. vinifera L.), in 2001. Moreover, the effects of girdling and cluster thinning on skin color were examined in 3 vineyards where coloration was restricted, in 2005. Coloration markedly different among vineyards, with color index values (0-5 grade) between 0.2 and 4.5. Despite differences in culturing methods and vine age, there were positive relationships among total soluble solids (TSS), the duration of plant exposure to temperatures between 20 and 25℃ from 8 to 21 days after the onset of coloring and the coloration. Girdling and cluster thinning increased the coloration and TSS in the vineyards where temperatures from 8 to 21 days after the onset of coloring were high. However, the effects of girdling and cluster thinning were low when shoot growth was vigorous. These findings indicate that factors other than temperatures and TSS are involved in the coloration of berry skins.