Verification of physiological response for the improvement of grape berry quality by air cooling mist solution.

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05562
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 39030:Horticultural science-related
• Research Institution: Kyoto University
• Principal Investigator: KATAYAMA(IKEGAMI) AYAKO (池上礼子) 京都大学, 農学研究科, 准教授 (00549339)
• Co-Investigator(Kenkyū-buntansha): 中野 龍平 京都大学, 農学研究科, 准教授 (70294444) ; 長坂 京香 京都大学, 農学研究科, 助教 (00931388)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ブドウ / 果実品質 / 着色 / 成熟開始 / ABA / ドライミスト

Outline of Final Research Achievements

Utilizing dry mist, which has been reported to promote coloring by lowering the ambient temperature of fruits, we conducted treatment trials on three red-colored varieties and the yellow-green variety 'Shine Muscat' grown in root-restricted trees at the Kyoto University Kizu Agricultural Station. The aim was to verify the differences in effects due to treatment timing and variety, to obtain the necessary knowledge for cultivation management, and to deepen the physiological understanding of the onset of fruit maturation. However, despite two years of trials, no improvement in fruit quality was observed in any treatment group. Instead, we proceeded with the preliminary trials for the evaluation of traits where ABA levels increase significantly and improve coloring during the late fruit maturation stage, and prepared a series of samples for omics analysis to explore key factors in the onset of fruit maturation.

Free Research Field

果樹園芸学

Academic Significance and Societal Importance of the Research Achievements

ブドウの着色は、遺伝的背景をもとに、環境要因である光、温度、樹勢などが複雑に作用し決定されるが、近年は高温による着色不足が問題となっている。
当初効果があるとされたドライミスト処理は本実験の手法では果実の品質向上効果がないことが明らかとなった。しかし、本来の果実成熟に関する基礎的知見を得て、果実成熟開始のファクターの同定や着色が良好となるような形質を支配する遺伝子を特定するための予備的な研究を進めており、本研究成果は今後の高品質果実の生産あるいは新育種育成に有意義な知見をもたらすと考えている。