Effect of Gibberellin on the Biosynthesis of Tocopherols in Oilseed Rape (Brassica napus L.) and Arabidopsis

文献类型： 外文期刊

第一作者： Du, Xue

作者： Du, Xue;Hussain, Nazim;Li, Zhilan;Jiang, Lixi;Chen, Xiaoyang;Hua, Shuijin;Zhang, Dongqing

作者机构：

关键词： Brassica;Arabidopsis;gibberellin (GA);paclobutrazol (PAC);tocopherol content;tocopherol composition;gene expression

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

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年卷期：

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收录情况： SCI

摘要： Elevating the yield and altering the composition of seed tocopherols (Toc's) are important to rapeseed breeding and production. However, little is known about the biosynthesis of Toc's in response to environmental signals. In this study, we investigated the effects of exogenous gibberellin (GA(3)) and paclobutrazol (PAC) on Toc biosynthesis. We also explored the interactive effects between the two plant growth regulators (PGRs) and other factors, such as PGR treatment duration, genotype, and growing location on the total Toc yield and composition in oilseed rape seed. GA(3) significantly enhanced the production of Toc's and elevated the alpha-/gamma-Toc ratio in a time- and genotype-dependent manner. By contrast, PAC significantly reduced Toc yield. Genotypic differences were observed in the effects of GA(3) on Toc yield and composition in the seeds. GA(3) significantly increased the Toc yield and alpha-/gamma-Toc ratio in Zheyou-50, a genotype with a low proportion of very long chain fatty acids (VLCFAs). However, GA(3) did not significantly influence these parameters in Jiu-Er-13Xi, a genotype with a high VLCFA proportion. The increased Toc yield induced by GA(3) was mediated by the upregulation of genes (BnPDS1 and BnVTE1) that catalyze the production of Toc precursors. Therefore, applying GA(3) can improve rapeseed quality by increasing Toc yield and improving Toc composition.

分类号： R15`S

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