| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
Drought decreases a plant growth, which leads to a yield reduction. In order to investigate the effects of drought stress on the plant growth, the magnitude of drought stress must be controlled. In this study, a soil matric potential (SMP)-based irrigation system that precisely controls soil moisture was developed. Using this system, rice seedlings were grown under three different drought levels denoted Md1, Md2 and Md3, with SMP values set to -9.8, -31.0, and -309.9 kPa, respectively. Although Md1 did not alter the visible phenotype, Md2 caused shoot growth retardation (SGR). Md3 markedly induced SGR, without photosynthesis inhibition. More severe drought (Sds), under which irrigation was terminated, resulted in leaf wilting and photosynthesis inhibition. Metabolome revealed the sugar accumulation under Md3 and Sds. Transcriptome showed that the expression profiles of associated genes supported the observed changes in photosynthesis and metabolites.
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