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| 著者 | Higuchi-Takeuchi M., Ichikawa T., Kondou Y., Matsui K., Hasegawa Y., Kawashima M., Sonoike K., Mori M., Hirochika H., Matsui M. | |
| タイトル | Functional analysis of two isoforms of leaf-type Ferredoxin-NADP(+)-oxidoreductase in rice using the heterologous expression system of Arabidopsis. | |
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Abstract: Ferredoxin-NADP(+)-oxidoreductase (FNR) mediates electron transfer between ferredoxin (Fd) and NADP(+); therefore, it is a key enzyme that provides the reducing power used in the Calvin cycle. Other than FNR, nitrite reductase, sulfite reductase, glutamate synthase, and Fd-thioredoxin reductase also accept electrons from Fd, an electron carrier protein in the stroma. Therefore, the regulation of electron partitioning in the chloroplast is important for photosynthesis and other metabolic pathways. The regulatory mechanism of electron partitioning, however, remains to be elucidated. We found, by taking advantage of a gain-of-function approach, that expression of two rice (Oryza sativa) full-length cDNAs of leaf-type FNRs (OsLFNR1 and OsLFNR2) led to altered chlorophyll fluorescence and growth in Arabidopsis (Arabidopsis thaliana) and rice. We revealed that overexpression of the OsLFNR1 and OsLFNR2 full-length cDNAs resulted in distinct phenotypes despite the high sequence similarity between them. Expression of OsLFNR1 affected the nitrogen assimilation pathway without inhibition of photosynthesis under normal conditions. On the other hand, OsLFNR2 expression led to the impairment of photosynthetic linear electron transport as well as Fd-dependent cyclic electron flow around photosystem I. The endogenous protein level of OsLFNR was found to be suppressed in both OsLFNR1- and OsLFNR2-overexpressing rice plants, leading to changes in the stoichiometry of the two LFNR isoforms within the thylakoid and soluble fractions. Thus, we propose that the stoichiometry of two LFNR isoforms plays an important role in electron partitioning between carbon fixation and nitrogen assimilation. |
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| 掲載誌 | Plant Physiol. | |
| Country | Japan | |
| 刊数 | 157(1) | |
| ページ | 96-108 | |
| 発刊年 | 2011 | |
| PubMed ID | 21734114 | |
| PubMed Central ID | 3165901 | |
| DOI | 10.1104/pp.111.181248 | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | C3H38 CAB1R CAB2R CP24 CP26 CP29 ELL LFNR1 LHCA2 LHCA3 LHCB1.1 LHCB3 PSAD PSAE PSAF PSAG PSAH PSAK PSAL PSAN PSB28 PSBO PSBP PSBR PSBS2 PSBW PSBX PSBY RCA _ _ _ _ _ _ _ _ _ | |
| INSD | - | |
| 系統 |
野生イネ コアコレクション |
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| 突然変異系統(遺伝研 Collection) | - | |
| 種子不稔系統 | - | |
| 致死変異体系統 | - | |
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組織別発生段階 - 突然変異系統(遺伝子) |
- | |
| 栽培イネ品種(遺伝研 Collection) | - | |
| 組織別発生段階 | - | |
