ストレプトマイシンにより無核化したブドウ'藤稔'の果粒肥大と品質に及ぼすジベレリンおよびCPPU処理の影響(発育抑制)  [in Japanese] Effects of Gibberellin and CPPU on Enlargement and Characteristics of Seedless Berries Induced by Streptomycin in the 'Fujiminori' Grape (Growth Regulation)  [in Japanese]

4倍性ブドウ'藤稔'において,開花前ストレプト7イシン(SM)200ppmで誘発した無核ブドウの肥大促進を図るために,満開時および満開11日後のジベレリンGA_3(GA)単独か,GAと1-(2-クロロー4-ピリジル)-3-フェニル尿素(CPPU)を混用して処理した場合,また,果房の着粒数を変えた場合,果粒肥大や品質に及ぼす影響について検討した.1.満開後11日目の,GA 25ppmとCPPU(5, 7.5, 10ppm)との混合処理では,高い濃度ほど大果房を生産したが,平均1粒重は20g以下であった.2.1果房当たり15〜25粒程度に制限した摘果処理効果を比較すると,CPPU処理ほど果粒肥大促進効果はなかった.しかし,大果粒でコンパクトな果房生産には,果皮色など品質面から23粒程度に制限する必要があると考えられた.3.1果粒重20g以上の大果粒で450g程度のコンパクトな果房は,満開時にGA 2.5ppmで処理し,さらに満開後11日目にGA 50または100ppmとCPPU 10ppm を混合処理することにより達成された.なお,これらの処理は,果粒の着色や果実品質に著しい影響を及ぼすことはなかった.

Effects of gibberellin (GA_3) and 1-(2-chloro-4-pyridyl)-3-phenylurea (CPPU) on enlargement of seedless berry induced by streptomycin (SM) in the grape cv. 'Fujiminori' were investigated. 1. Seedless berries induced by SM were treated with the mixture of GA_3 25 ppm and CPPU 5, 7.5 or 10 ppm. The higher the concentration of CPPU used, the heavier the cluster that was harvested. However, individual berry weight was less than 20 g. 2. The number of berries per cluster didnot affect the promotion of berry size, in comparison with CPPU treatment. The best result was realized when berry thinning to about 23 berries per cluster was performed. 3. Enlarged grapes over 20 g were harvested when berries were sprayed by GA_3 2.5 ppm at full bloom, followed by a mixture of GA_3 50 to 100 ppm and CPPU 10 ppm 11 days later. The berries didnot show any inferior effects such as pale skin color, lower sweetness and less acidity.