Breeding of low-chill and early-ripening peach and its utilization

• Project/Area Number: 18K05621
• 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: Kagawa University
• Principal Investigator: Beppu Kenji 香川大学, 農学部, 教授 (30281174)
• Project Period (FY): 2018-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 低温要求性 / モモ / 育種 / 果実品質 / 少低温要求性モモ / 活用 / 低温要求量 / 品種登録 / 炭酸ガス施肥 / 胚培養 / 品種改良 / 少低温要求性 / 休眠

Outline of Final Research Achievements

Mid-chill cultivars obtained from cross between high chill cultivars and low-chill cultivars were self-pollinated and cross-pollinated. Obtained seeds were embryo-cultured and moved to the research field. Eighteen seedlings were selected and transplanted to soil. One tree of white flesh and the other tree of yellow flesh with low-chill, early-maturing and high fruit quality were finally selected. Regarding the utilization, foliar application of potassium and the agent for promoting photosynthesis increased fruit size and sugar level. The treatment of girdling also enhanced fruit quality. Besides, CO2 application in early forcing culture in greenhouse raised the size and sugar concentration in fruit.

Academic Significance and Societal Importance of the Research Achievements

果樹の低温要求性に関する遺伝様式の研究はこれまであまり行われていなかった。本研究は、果樹の一つであるモモを用いて、低温要求性に関する遺伝様式の一部解明に貢献した点で学術的意義が大きい。また、果樹における少低温要求性品種の現場への活用についてはあまり検討されていなかったが、本研究では、様々な処理を試して少低温要求性モモの果実品質を高めることで現場への活用を広げることにも貢献した。この点で社会的意義は大きいといえる。

Research Products

• [Journal Article] The effects of foliar spray of potassium sulfate (K2SO4) at different growth stages on fruit growth and quality of the low-chill early ripening peach ‘KU-PP1’. (2024)
  • Author(s): Khanal, S. R., Kentaro, O., Poudel. P. R., I Kataoka, I., Mochioka, R., and Beppu, K.
  • Journal Title: Tropical Agriculture and Development Volume: in press
  • Peer Reviewed
• [Journal Article] Fruit quality of the low-chill early ripening peach cultivar 'KU-PP2' is affected by the time of fruit thinning. (2022)
  • Author(s): Khanal Sanjaya Raj, Ikuo Kataoka, Mochioka Ryosuke and Kenji Beppu
  • Journal Title: Journal of Applied Horticulture, volume 24, 2022 Volume: 24 Issue: 01 Pages: 33-35
  • DOI: 10.37855/jah.2022.v24i01.06
  • Peer Reviewed
• [Journal Article] Effect of girdling time on growth and fruit quality of low-chill early ripening peach ‘KU-PP2’ (2022)
  • Author(s): Khanal Sanjaya Raj, Poudel Puspa Raj, Ikuo Kataoka, Mochioka Ryosuke, Ono Kentaro and Kenji Beppu
  • Journal Title: Acta Horticulturae Volume: 1352 Issue: 1352 Pages: 561-566
  • DOI: 10.17660/actahortic.2022.1352.76
  • Peer Reviewed
• [Journal Article] Effect of growth temperature levels on photosynthetic ability and fruit quality of ‘KU-PP2’, a new low-chill peach cultivar (2021)
  • Author(s): Sikhandakasmita, P., Kataoka, I., Ogata, T., Mochioka, R., and Beppu, K.
  • Journal Title: Advances in Horticultural Science Volume: 35 Pages: 233-241
  • Peer Reviewed / Open Access
• [Journal Article] Chilling and heating accumulations impact bud burst and flowering of 'KU-PP2' peach tree (2021)
  • Author(s): Sikhandakasmita, P., Kataoka, I., Mochioka, R., and Beppu, K.
  • Journal Title: Proceeding of the third Asian horticultural congress Volume: - Pages: 213-220
• [Journal Article] 低温要求量の少ないモモ品種‘KU-PP1’および‘KU-PP2’の収穫適期の検討 (2021)
  • Author(s): 戸梶裕太，片岡郁雄，別府賢治
  • Journal Title: 香川大学農学部学術報告 Volume: 73 Pages: 7-11
  • NAID: 120007009231
• [Journal Article] Chilling and heating accumulations impact bud burst and flowering of ‘KU-PP2’ peach tree (2020)
  • Author(s): P. Sikhandakasmita, I. Kataoka, R. Mochioka, K. Beppu
  • Journal Title: Acta Horticulturae Volume: 投稿中
  • Peer Reviewed
• [Presentation] Effect of girdling time on growth and fruit quality of low-chill early ripening peach ‘KU-PP2’ (2022)
  • Author(s): Khanal Sanjaya Raj, Poudel Puspa Raj, Ikuo Kataoka, Mochioka Ryosuke, Ono Kentaro and Kenji Beppu
  • Organizer: X International Peach Symposium
• [Presentation] 低温要求量の少ないモモ品種‘KU-PP2’における生育温度が果実の発育や品質に及ぼす影響 (2021)
  • Author(s): シカンダカサミタ パナワット・片岡郁雄・望岡亮介・別府賢治
  • Organizer: 園芸学会
• [Presentation] Embryo rescue of the early-ripening peach cultivars with lower-chilling requirement, ‘KU-PP1’ and ‘KU-PP2’ (2019)
  • Author(s): Sikhandakasmita,Panawat，片岡郁雄，別府賢治
  • Organizer: 園芸学会
• [Presentation] Occurrence of double pistils in ‘KU-PP1’ peach (2018)
  • Author(s): Panawat Sikhandakasmita，片岡郁雄，別府賢治
  • Organizer: 園芸学会