Study on function of low temperature signal on dormancy regulation in deciduous fruit trees

• Project/Area Number: 22380019
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Horticulture/Landscape architecture
• Research Institution: University of Tsukuba
• Principal Investigator: SUGAYA Sumiko 筑波大学, 生命環境系, 教授 (90302372)
• Co-Investigator(Kenkyū-buntansha): GEMMA Hiroshi 筑波大学, 生命環境系, 教授 (70094406) ; 瀬古澤 由彦 筑波大学, 生命環境系, 助教 (90361310)
• Co-Investigator(Renkei-kenkyūsha): SEKOZAWA Yoshihiko 筑波大学, 生命環境系, 助教 (90361310)
• Project Period (FY): 2010-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000); Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2011: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2010: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
• Keywords: 果樹 / 休眠 / 低温 / メタボローム / 代謝 / ニホンナシ / 遺伝子発現 / 落葉果樹 / 植物ホルモン

Research Abstract

Effects of low temperature on physiology of flower bud during dormancy period were investigated using Japanese pears. Insufficient amount of low temperature during endo-dormancy, bud abortion and necrosis were found in flowering time. Metabolome analysis indicated that metabolites in flower buds of 600CH (chilling hours) and 750CH were different from those in 0CH and 300CH. PCA analysis revealed that phosphoric acids and organic acid contents would be related to chilling. Enzyme activities involved in sugar metabolism are studied during endo-dormancy and effects of hydrogen cyanamide and potassium nitrate were investigated.

Research Products

• [Presentation] Effects of potassium nitrate and hydrogen cyanamide on bud dormancy of'Housui'Japanese pear under mild winter conditions (2013)
  • Author(s): Humberto Mitio Horikoshi, Yoshihiko Sekozawa, Sumiko Sugaya, Hiroshi Gemma
  • Organizer: 園芸学会
  • Place of Presentation: 岩手大学