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Different effects on ACC oxidase gene silencing triggered by RNA interference in transgenic tomato

文献类型： 外文期刊

作者： Xiong, AS 1 ; Yao, QH 1 ; Peng, RH 1 ; Li, X 1 ; Han, PL 1 ; Fan, HQ 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Agro Biotechnol Res Ctr, Shanghai Key Lab Agr Genet & Breeding, Shanghai 201106, Peoples R China

关键词： RNA interference;ACC oxidase;ethylene;shelf life;tomato

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN： 0721-7714

年卷期： 2005 年 23 卷 9 期

页码：

收录情况： SCI

摘要： RNA interference (RNAi) is a potent trigger for specific gene silencing of expression in a number of organisms and is an efficient way of shutting down gene expression. 1-Aminocyclopropane-1-carboxylate (ACC) oxidase catalyzes the oxidation of ACC to ethylene, a plant growth regulator that plays an important role in the tomato ripening process. In this research, to produce double-stranded (ds)RNA of tomato ACC oxidase, we linked the sense and antisense configurations of DNA fragments with 1,002-bp or 7-nt artificially synthesized fragments, respectively, and then placed these under the control of a modified cauliflower mosaic virus 35S promoter. The dsRNA expression unit was successfully introduced into tomato cultivar Hezuo 906 by Agrobacterium tumefaciens-mediated transformation. Molecular analysis of 183 transgenic plants revealed that the dsRNA unit was integrated into the tomato genome. With respect to the construct with the 1,002-bp linker, the severity of phenotypes indicated that 72.3% of the transformed plants had non-RNA interference, about 18.1% had semi-RNA interference, and only 9.6% had full-RNA interference. However when the construct with the 7-nt linker was used for transformation, the results were 13.0%, 18.0%, and 69.0%, respectively, indicating that the short linker was more efficient in RNAi of transgenic tomato plants. When we applied this fast way of shutting down the ACC oxidase gene, transgenic tomato plants were produced that had fruit which released traces of ethylene and had a prolonged shelf life of more than 120 days. The RNA and protein analyses indicated that there was non-RNA interference, semi-RNA interference and full-RNA interference of ACC oxidase in the transgenic tomato plants.

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