阿拉伯芥中miR160/AUXIN RESPONSE FACTOR (ARF)10、ARF16及ARF17調節熱逆境反應機制

郭家嘉

doi:10.6342/NTU.2015.11160

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阿拉伯芥中miR160/AUXIN RESPONSE FACTOR (ARF)10、ARF16及ARF17调节热逆境反应机制

miR160 and AUXIN RESPONSE FACTOR10, 16, and 17 affects heat responses in Arabidopsis

郭家嘉 , 硕士　　导师：郑石通　　

繁体中文 DOI： 10.6342/NTU.2015.11160

阿拉伯芥； miR160 ；热逆境； Auxin Response Factor (ARFs) ； Heat Shock Protein (HSPs) ；耐热性； Arabidopsis ； miR160 ； Auxin ； Auxin Response Factor (ARFs) ； Heat Shock Protein (HSPs) ； Thermotolerance

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High temperature negatively affects plant growth and development, and even causes cell death and reduces crop yield. Several heat-related genes obtained from microarray analyses are targets of miRNAs, including AUXIN RESPONSE FACTOR10 (ARF10), the target of miR160. The results of gene expression assay indicated that miR160 and its precursors were induced by heat and its targets, ARF10, ARF 16, and ARF17, were significantly repressed. Hence, transgenic plants overexpressing pre-miR160a（160OE）and expressing miR160 target mimic inhibitor（MIM160）were generated to investigate the roles of miR160 under heat stress. The expression of ARF10, ARF16, and ARF17 was decreased in 160OE plants and increased in MIM160 plants in heat stress. When 160OE plants were treated with heat stress, seed germinations, survival rates, hypocotyl lengths, and rachis growth of 160OE were elevated compared to those of WT. However, these phenotypes in MIM160 plants were worse than WT after heat treatment. These results indicated that increasing miR160 expression could enhance thermotolerant abilities of plants. In addition, arf10, arf16, and arf17 mutants ordered from ABRC also presented better adaption to heat than WT. After heat treatment, the seed germination and inflorescence stem length of arf10, arf16, and arf17 mutants were better and longer, respectively, than those of WT. The arf16 and arf17 mutants also showed the increased hypocotyl lengths compared to WT under heat treatment. These results demonstrated that miR160 targets may negatively regulate the plant development under heat stress. Furthermore, the expression of HSP101, HSP70B, HSP21, HSP17.6A, and HSP17.6II was affected in 160OE and MIM160 plants under heat stress. In conclusion, miR160 and its targets alter the plant development and the HSPs gene expression to regulate plant responses in heat stress.

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DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。