Study on Mechanisms of Growth Promotion by Sodium Fertilizaiton in Rice

• Project/Area Number: 16K07643
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Plant nutrition/Soil science
• Research Institution: Hiroshima University
• Principal Investigator: Ueda Akihiro 広島大学, 統合生命科学研究科, 准教授 (10578248)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: ナトリウム施肥 / イネ / 植物栄養学 / ナトリウム

Outline of Final Research Achievements

Accumulation of excess sodium in soils inhibits plant growth. However, growth of some plant species can be promoted by application of lower concentration of sodium. The objective of this study is to access whether sodium fertilization is effective for growth promotion in rice or not. Large-scale screening identified some rice varieties whose growth is promoted by sodium fertilization. Promotion of root growth is clearly observed in these rice varieties with sodium fertilization. The findings including whole transcriptomic analysis and development of progeny groups established the basis on further analysis for identification of determinant genes/loci controlling growth promotion by sodium fertilization in rice.

Academic Significance and Societal Importance of the Research Achievements

ナトリウムは土壌に過剰に蓄積されると塩害を引き起こすため、土壌や潅漑水のナトリウム濃度の管理は農作物生産を低下させないために極めて重要である。本研究では、有害元素としてのイメージが強いナトリウムを低濃度で施用すれば植物の生育促進に有効であることを検証することを目的とした。塩害に弱いイネを用いた品種選抜を行ったところ、低濃度のナトリウムで生育が促進される品種が見つかった。今後、ナトリウム施肥による生育促進機構を明らかにすることで、研究成果がイネの生産性向上につながることが期待される。

Research Products

• [Int'l Joint Research] カセサート大学(タイ)
• [Journal Article] Characterization of type 3 metallothionein-like gene ( OsMT-3a ) from rice, revealed its ability to confer tolerance to salinity and heavy metal stresses (2018)
  • Author(s): Mekawy Ahmad Mohammad M.、Assaha Dekoum V.M.、Munehiro Riko、Kohnishi Eri、Nagaoka Toshinori、Ueda Akihiro、Saneoka Hirofumi
  • Journal Title: Environmental and Experimental Botany Volume: 147 Pages: 157-166
  • DOI: 10.1016/j.envexpbot.2017.12.002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A salinity tolerant japonica cultivar has Na+ exclusion mechanism at leaf sheaths through the function of a Na+ transporter OsHKT1;4 under salinity stress (2018)
  • Author(s): Wangsawang T, Chuamnakthong S, Kohnishi E, Sripichitt P, Sreewongchai T, Ueda A
  • Journal Title: Journal of Agronomy and Crop Science Volume: 204 Issue: 3 Pages: 274-284
  • DOI: 10.1111/jac.12264
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The Role of Na+ and K+ Transporters in Salt Stress Adaptation in Glycophytes (2017)
  • Author(s): Assaha Dekoum V. M.、Ueda Akihiro、Saneoka Hirofumi、Al-Yahyai Rashid、Yaish Mahmoud W.
  • Journal Title: Frontiers in Physiology Volume: 8 Pages: 1-19
  • DOI: 10.3389/fphys.2017.00509
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 塩を噴く植物ローズグラスの耐塩性機構～塩噴き植物は塩害に強い？～ (2017)
  • Author(s): 上田晃弘
  • Journal Title: 化学と生物 Volume: 55(1) Pages: 5-7
  • NAID: 130006258118
  • Peer Reviewed
• [Presentation] ナトリウム施肥によるイネの生育促進機構の解明 (2018)
  • Author(s): 藤田貴文，大隅彰太，実岡寛文，上田晃弘
  • Organizer: 2018年度日本土壌肥料学会神奈川大会
• [Presentation] 塩ストレスが塩生植物の生育と養分吸収に及ぼす影響 (2018)
  • Author(s): 大戸貴裕，実岡寛文，上田晃弘
  • Organizer: 2018年度日本土壌肥料学会神奈川大会
• [Presentation] ナトリウムはイネの生育促進に寄与するのか？ (2017)
  • Author(s): 上田晃弘
  • Organizer: 第9回中国地域育種談話会
  • Invited
• [Presentation] ナトリウム施肥により生育が促進されるイネ品種の選抜 (2016)
  • Author(s): 大隅彰太、多田祐真、上田晃弘、実岡寛文
  • Organizer: 日本土壌肥料学会2016年度佐賀大会
  • Place of Presentation: 佐賀大学
  • Year and Date: 2016-09-20
• [Presentation] ナトリウム施肥により生育が促進されるイネ品種の選抜 (2016)
  • Author(s): 大隅彰太、多田祐真、上田晃弘、実岡寛文
  • Organizer: 第2回植物の栄養研究会
  • Place of Presentation: 名古屋大学
  • Year and Date: 2016-09-02