| Project/Area Number |
21K20584
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0602:Agricultural and environmental biology and related fields
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2021-08-30 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | Rice / Heat stress / Yield / Quality / Gene expression / Grain filling / Transgenerational memory / DNA methylation |
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| Outline of Research at the Start |
In rice, heat stress during grain filling profoundly affects phenotypic changes of progeny plants, which is known as "transgenerational stress memory." Plants grown from heat stressed seeds develop early heading phenotype, higher tiller number and higher yield at harvest. These adaptive traits of progeny plants are regulated via DNA methylation. With a better understanding of mechanism underlying this phenomenon, it could be a novel and a promising way to increase grain yield in a sustainable and non-genetic modified way without changing plant’s genome to maintain cultivar specificity.
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| Outline of Final Research Achievements |
We have elucidated the effects of heat stress exposed at different grain developmental stages in rice on yield and quality. It was shown that heat stress during the early phase of grain filling plays important role to reduce grain yield and quality compared to the later phase, which showed almost no reduction. In all, we proposed that exposure to heat stress at different stages during grain filling resulted in different traits at harvest, which is expected to be regulated differently via epigenetic regulation. In our next study, we aim to elucidate the roles of epigenetic regulations of each grain filling stage under heat and the effects on the next generation.
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| Academic Significance and Societal Importance of the Research Achievements |
We have shown that heat stress during early phase of grain filling had more negative effects on grain yield and quality compared to that of the later phase. Elucidation of this mechanism could help to increase rice yield and quality under heat stress condition.
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