| Budget Amount *help |
¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2012: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
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| Outline of Final Research Achievements |
This study investigated the variations in photosynthetic traits and photosynthetic nitrogen use efficiency (PNUE) and their regulatory factors in C4 grasses and closely related C4 group. The cultivar and species variations in photosynthetic traits and PNUE were examined for the C4 crops, maize and amaranth. There were variations of 1.5-2.1 times between the minimum and maximum values of photosynthetic rate and PNUE. The stomatal conductance and the decarboxylation of C4 acids and later process in C4 photosynthesis were strongly involved in the variation in photosynthetic rate. In grasses, remarkable difference in PNUE was also found among photosynthetic types; NADP-ME C4 > NAD-ME C4 = PCK C4 > C3 grasses. Irrespective of C3 and C4 species, PNUE of sedges (Cyperaceae) was lower than that of grasses. This study also revealed the nitrogen responses of photosynthetic and structural traits in leaves of the C4 crops, sorghum and millet.
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