Fragrance of the rice grain achieved via artificial microRNA-induced down-regulation of OsBADH2

文献类型: 外文期刊

第一作者: Chen, Mingliang

作者: Chen, Mingliang;Wei, Xiangjin;Shao, Gaoneng;Tang, Shaoqing;Luo, Ju;Hu, Peisong;Chen, Mingliang

作者机构:

关键词: fragrant rice;2AP;amiRNA;proline

期刊名称:PLANT BREEDING ( 影响因子:1.832; 五年影响因子:1.956 )

ISSN: 0179-9541

年卷期: 2012 年 131 卷 5 期

页码:

收录情况: SCI

摘要: With 6 figures and 1 table Abstract 2-acetyl-1-pyrroline (2AP) is the principal compound responsible for grain fragrance in rice. In fragrant rice cultivars, BADH2 (betaine-aldehyde dehydrogenase 2) is inactivated. Here, we describe the effect of amiRNA (artificial microRNA) transgenesis targeted at BADH2 in rice. BADH2 (but not BADH1) expression was down-regulated in transgenic lines where the amiRNA was driven by the maize ubiquitin promoter, and in these lines, grain 2AP content was also significantly elevated; meanwhile, 2AP could not be detected in the grain of wild-type lines. The leaf proline content in the transgenics was increased through the simultaneous down-regulation of PRODH and up-regulation of P5CS. In transgenic lines where the same amiRNA was driven by the endosperm-specific promoter GluC, no effect on BADH2 expression was detectable, and the content of grain 2AP did not differ from that present in wild-type grains.

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