| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Atmospheric nitrogen dioxide (NO2) at ambient concentrations (10~50 ppb) is as a novel positive growth regulator for plants. NO2 accelerates cell proliferation and cell enlargement to nearly double organ size and shoot biomass in a variety of species including Arabidopsis. NO2 also accelerates flowering time. Furthermore, NO2 suppresses hypocotyl elongation in Arabidopsis. However, information on the NO2-sensing mechanisms is scarce. In this study, I screened known and unknown Arabidopsis mutants that lack NO2-mediated suppression of hypocotyl elongation, and obtained mutants that lack sensing NO2. I also investigated NO2-mediated regulation of expression of the genes that are controlled by the NO2-sensing gene. It is suggested that NO2 downregulates those NO2-sensitive genes that are under the control of the NO2-sensing gene to suppress hypocotyl elongation.
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