| Project/Area Number |
22380013
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Crop science/Weed science
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| Research Institution | Nagoya University |
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Principal Investigator |
YAMAUCHI Akira 名古屋大学, 生命農学研究科, 教授 (30230303)
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| Co-Investigator(Kenkyū-buntansha) |
INUKAI Yoshiaki 名古屋大学, 大学院・生命農学研究科, 助教 (20377790)
OGAWA Atsushi 秋田県立大学, 生物資源学部, 准教授 (30315600)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2010: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
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| Keywords | 土壌ストレス / 変動ストレス / コアコレクション / 可塑性 / 根 / QTL / 染色体部分置換系統群 / 天水田 / 土壌水分 / 染色体都分置換系統群 |
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| Research Abstract |
This study aimed to examine the functional roles of the ability of the plant to change its development as environmental conditions change, which is known as phenotypic plasticity in crop adaptation to water stress such as drought as well as soil moisture fluctuation stress, and. We conducted a series of experiments to evaluate the functional roles of root plasticity by using various accessions/populations such as OryzaSNP germplasm set, chromosome segment substitution lines (CSSL) derived from Nipponbare and Kasalath cross, IR 64 INLs and a few promising genotypes for stress tolerance including NERICA (New Rice for Africa that is an interspecific cross between Oryza sativa and Oryza glaberrima). We used the rootbox-pinboard method, slant tube method, experimental bed installed with line source sprinkler system that can create gradient in drought stress intensities, and sloping bed that can create increasing rooting depths under field conditions for phenotyping root traits. These results consistently showed that in addition to deep roots, the plastic development of the root system is a key trait for plant adaptation to water stress. We also found that the plasticity in development of the entire root system is important in response to progressive drought, while that in lateral root development and aerenchyma formation is important in response to transient drought and O2 deficient conditions. We quantitatively showed the contributions of root plasticity to dry matter production through enhanced water uptake under water stress.
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