| Project/Area Number |
20K21308
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 39:Agricultural and environmental biology and related fields
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| Research Institution | Gifu University |
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Principal Investigator |
MATSUI Tsutomu 岐阜大学, 応用生物科学部, 教授 (70238939)
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| Project Period (FY) |
2020-07-30 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | イネ / 受粉 / 穂の傾き / 安定性 / 不稔 / 傾き |
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| Outline of Research at the Start |
イネの穂の傾きは，受粉の不安定化を通じてイネの高温不稔を助長し，世界のコメの生産に影響する可能性がある．本研究は，デジタルマイクロスコープやデジタルカメラを用いて研究期間に以下の点を明らかにする．１）穂の傾きが受粉の不安定化を通じて高温不稔の発生に及ぼす影響の定量的評価．２）穂の傾斜が受粉の安定性に影響を及ぼす仕組みと高温不稔を助長する仕組み．
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| Outline of Final Research Achievements |
In this study, first, by the model experiment, we verified that inclination of rice panicle makes the pollination and floret fertility unstable even in the community.Next, we analyzed how panicle inclination affects pollination stability and fertility in overseas high-temperature paddy fields and showed that panicle inclination promoted the destabilization of pollination under high-temperature conditions and leads to floret sterility. Finally, using a commercially available digital camera, a technique was established to capture flowering from two directions and to grasp the positional relationship of floral organs in three dimensions. The instability of pollination due to the inclination of the panicle may be due to the increase in the vertical angle from the stigma to the anther dehiscence.
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| Academic Significance and Societal Importance of the Research Achievements |
開花時に穂が直立していることが安定した受粉，高温耐性のために重要であることが明らかにされた．開花時に直立した穂が安定した受粉，高温耐性のための育種目標となることを示している．
現在，海外では，多収のために極端に大きな穂や大きな枝梗を持つ品種が育種されているが，そういったイネでは開花時に穂や一次枝梗が傾きやすく，受粉が不安定になったり高温耐性が低下したりする可能性がある．
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