BnWRI1 coordinates fatty acid biosynthesis and photosynthesis pathways during oil accumulation in rapeseed
文献类型: 外文期刊
第一作者: Wu, Xue-Long
作者: Wu, Xue-Long;Liu, Zhi-Hong;Hu, Zhang-Hua;Huang, Rui-Zhi
作者机构:
关键词: BnWRI1;Brassica napus;oil accumulation;photosynthesis;transcription factor
期刊名称:JOURNAL OF INTEGRATIVE PLANT BIOLOGY ( 影响因子:7.061; 五年影响因子:6.002 )
ISSN: 1672-9072
年卷期: 2014 年 56 卷 6 期
页码:
收录情况: SCI
摘要: Photosynthesis in "green" seeds, such as rapeseed, soybean, and Arabidopsis, plays a substantial role in the improved efficiency of oil accumulation. However, the molecular mechanism underpinning the coordinated expression of fatty acid (FA) biosynthesis-and photosynthesis-related genes in such developing seeds remains to be elucidated. Here, we found that seed-specific overexpression of BnWRI1, a WRI1 homolog from rapeseed (Brassica napus cv. ZGY2), results in enhanced chlorophyll content in developing seeds and increased oil content and seed mass in matured seeds. BnWRI1 was co-expressed with BnBCCP and BnCAB, two marker genes of FA biosynthesis and photosynthesis during seed development, respectively. Overexpression of BnWRI1 increased expression of both marker genes. Further, the nuclear-localized BnWRI1 protein was found to act as a transcription activator. It could bind to the GT1-element and/or GCC-box, which are widespread in the upstream regions of genes involved in FA biosynthesis and photosynthesis pathways. Accordingly, BnWRI1 could interact with promoters of BCCP2 and LHB1B2 in vivo. These results suggested that BnWRI1 may coordinate FA biosynthesis and photosynthesis pathways in developing seeds via directly stimulating expression of GT1-element and/or GCC-box containing genes.
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