2023 Fiscal Year Final Research Report
Mechanism of destabilization of pollination and fertility of rice by inclination of panicle under high temperature condition
| 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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| Keywords | イネ / 受粉 / 穂の傾き / 安定性 / 不稔 |
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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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| Free Research Field |
作物学
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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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