Xylem embolism development under drought and its repair after drought release by stem cutting on woody species

• Project/Area Number: 25850102
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: The University of Tokyo
• Principal Investigator: OGASA Mayumi 東京大学, 新領域創成科学研究科, 日本学術振興会特別研究員PD (10646160)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 通水阻害 / 木部水分通導 / 道管 / MRI / アーティファクト / 木部内水分布 / 低温走査電子顕微鏡（cryo-SEM）

Outline of Final Research Achievements

Spatial pattern of xylem embolism development under drought stress and xylem water distribution after stem cutting under water were investigated non-destructively using magnetic resonance imaging system for three deciduous woody species. Xylem embolism was found at first around the pith in all species but its developing pattern was different among species. Xylem water distribution did not change after the release of drought stress by stem cutting, suggesting no short-term embolism repair on excised shoot.

Research Products

• [Journal Article] Vulnerability to cavitation differs between current-year and older xylem: nondestructive observation with a compact MRI of two deciduous diffuse-porous species (2015)
  • Author(s): Fukuda K., Kawaguchi D., Aihara T., Ogasa M.Y., Miki N.H., Umebayashi T.
  • Journal Title: Plant, Cell & Environment Volume: in press Issue: 12 Pages: 2508-2518
  • DOI: 10.1111/pce.12510
  • Peer Reviewed
• [Presentation] 樹木用MRIを用いた樹幹内部における水分挙動の非破壊的観察 (2015)
  • Author(s): 小笠真由美，内海泰弘，三木直子，矢崎健一，福田健二
  • Organizer: 第126回日本森林学会大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2015-03-27
• [Presentation] Recovery performance in xylem hydraulic conductivity is correlated with cavitation resistance for temperate deciduous tree species (2015)
  • Author(s): 小笠真由美
  • Organizer: 第126回日本森林学会大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2015-03-27
  • Invited
• [Presentation] 縞枯山シラビソ風衝木における冬期のエンボリズムとその回復 (2015)
  • Author(s): 小笠真由美, 大條弘貴, 大塚晃弘, 種子田春彦, 丸田恵美子
  • Organizer: 第62回日本生態学会大会
  • Place of Presentation: 鹿児島大学
  • Year and Date: 2015-03-21
• [Presentation] 負圧下の樹幹を水切りすることによる道管の空洞化：コンパクトMRIを用いたブドウ木部の観察
  • Author(s): 小笠真由美，内海泰弘，三木直子，福田健二
  • Organizer: 第61回日本生態学会大会
  • Place of Presentation: 広島国際会議場（広島）