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| 著者 | Joshi R., Sahoo K.K., Tripathi A.K., Kumar R., Gupta B.K., Pareek A., Singla-Pareek SL. | |
| タイトル | TKnockdown of an inflorescence meristem-specific cytokinin oxidase - OsCKX2 in rice reduces yield penalty under salinity stress condition. | |
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Abstract: Cytokinins play a significant role in determining grain yield in plants. Cytokinin oxidases catalyze irreversible degradation of cytokinins and hence modulate cellular cytokinin levels. Here, we studied the role of an inflorescence meristem-specific rice cytokinin oxidase - OsCKX2, in reducing yield penalty under salinity stress conditions. We utilized an RNAi-based approach to study the function of OsCKX2 in maintaining grain yield under salinity stress condition. Ultra-performance liquid chromatography (UPLC)-based estimation revealed a significant increase in cytokinins in the inflorescence meristem of OsCKX2-knockdown plants. To determine if there exists, a correlation between OsCKX2 levels and yield under salinity stress condition, we assessed the growth, physiology and grain yield of OsCKX2-knockdown plants vis-à-vis the wild-type. OsCKX2-knockdown plants showed better vegetative growth, higher relative water content as well as photosynthetic efficiency, and reduced electrolyte leakage as compared to the wild-type under salinity stress. Importantly, we found a negative-correlation between OsCKX2 expression and plant productivity as evident by assessment of agronomical parameters such as panicle branching, filled grains per plant, and harvest index both under control and salinity stress conditions. These results suggest that OsCKX2, via controlling cytokinin levels, regulates floral primordial activity modulating rice grain yield under normal as well as abiotic stress conditions. |
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| 掲載誌 | Plant Cell Environ. | |
| Country | India | |
| 刊数 | ||
| ページ | ||
| 発刊年 | 2017 | |
| PubMed ID | 28337744 | |
| PubMed Central ID | - | |
| DOI | 10.1111/pce.12947 | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | GN1A | |
| 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 | - | |
