Role of ABA on host assimilates up-take by root parasitic weed Striga hermonthica

• Project/Area Number: 25850011
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Kobe University (2015); Tottori University (2013-2014)
• Principal Investigator: Inoue Tomoe 神戸大学, 研究基盤センター, 研究支援推進員 (30403380)
• Research Collaborator: Abdel Gabal Babiker
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: ソルガム / ストライガ / Striga hermonthica / アブシジン酸 / 根寄生雑草 / 国際研究者交流 / スーダン

Outline of Final Research Achievements

Striga hermonthica, a root hemiparasitic weed, is a threat to food security in sub-Saharan Africa. The parasite is connected to the host root xylem, and withdraws host assimilates through the transpiration stream. Although stomatal closure of most of the plant species is regulated by abscisic acid (ABA), stomata of Striga is little responded to ABA and Striga infection increases host ABA concentration. Experiments were conducted to clarify if Striga synthesize ABA and translocate it to the host. ABA concentration in single Striga was as high as that of Striga parasitism on sorghum. ABA concentration in single Striga was unaffected by osmotic potential, and higher under dark than under light. To confirm if ABA translocate from Striga to the host, d6-ABA was applied on Striga leaves. The d6-ABA was detected in leaf of Striga-infectd sorghum, but also in untreated Striga-infectd sorghum. Thus translocation of ABA from Striga to the host did not confirmed by this approach.

Research Products

• [Int'l Joint Research] スーダン科学技術大学(スーダン)
• [Presentation] 根寄生雑草ストライガの宿主からの同化産物の収奪にはアブシジン酸に対する気孔応答の異常が関与している (2015)
  • Author(s): 1)井上知恵・鮫島啓彰・上野琴巳・Abdel Gabar Babiker・杉本幸裕
  • Organizer: 植物化学調節学会第50回記念東京大会
  • Place of Presentation: 東京大学（東京都文京区）
  • Year and Date: 2015-10-23
• [Presentation] Translocation of host materials to parasite: Stomatal response and photosynthetic capacity of Striga hermonthica and sorghum under water stress (2014)
  • Author(s): Inoue, T., Yamauchi, Y., Eltyeb, A.A., Samejima, H., Ueno, K., Babiker, A.G.E., Sugimoto, Y.
  • Organizer: International Seminar on SATREPS Project on Striga Management
  • Place of Presentation: Khartoum, Sudan
  • Year and Date: 2014-09-15