| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Rainfed lowland rice ecosystems greatly varied in water availability and experience soil moisture fluctuations (SMF), which influence root development and then plant growth. We evaluated the root response under SMF with special emphasis on the relationship between root morphology and anatomy along root axis focusing on different ages. Also we characterized soil and climate environments in rainfed lowland fields in Philippines.
The greater root elongation below the hardpan soil layer contributed to high adaptation to SMF, and this was related to root arenchyma formation and sclerenchyma development. However, these responses were not synchronized at the same position. The field study in Philippines showed that the main limiting factor of rice yield was low solar radiation during wet season, but combination of drought and nitrogen deficiency during dry season.
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