2015 Fiscal Year Final Research Report
Elucidation of the symbiosis mechanism to improve the nitrogen fixation in legume
| Project/Area Number |
25450084
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Kagawa University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 共生窒素固定 / ミヤコグサ / 根粒菌 / 老化 |
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| Outline of Final Research Achievements |
Iron is an essential micronutrient for the legume rhizobium symbiosis and is accumulated abundantly in nodule. Iron homeostasis needs to be strictly controlled to avoid toxicity. Homeostasis of iron in plants is achieved through processes requiring proteins and small organic molecules. Among the molecules, ferritins are a class of iron storage proteins. During nodule senescence, total iron concentration in nodule was decreased, whereas expression of ferritin, Ljfer1, was induced in Lotus japonicus. We have identified signal transduction pathway leading to the increase of Ljfer1 in nodule. The Ljfer1 promoter of L. japonicus is conserved Iron-Dependent Regulatory Sequence (IDRS). The expression of Ljfer1 was induced by application of iron or sodium nitroprusside. Moreover, application of iron in nodule increased the nitric oxide (NO). These data indicate that iron-induced NO leads to increase the expression of Ljfer1 in the senescence of L. japonicus nodule.
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| Free Research Field |
植物栄養学
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