J Integr Plant Biol. ›› 2014, Vol. 56 ›› Issue (6): 582-593.DOI: 10.1111/jipb.12158

• Molecular Physiology • Previous Articles     Next Articles

BnWRI1 coordinates fatty acid biosynthesis and photosynthesis pathways during oil accumulation in rapeseed

Xue-Long Wu, Zhi-Hong Liu, Zhang-Hua Hu and Rui-Zhi Huang*   

  1. Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Key Laboratory of Plant Metabolic Engineering of Zhejiang Province, Hangzhou, China
  • Received:2013-10-22 Accepted:2013-12-30 Published:2014-01-07
  • About author:*Correspondence: E-mail: huangrz2001@aliyun.com

Abstract:

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.

 

Wu XL, Liu ZH, Hu ZH, Huang RZ (2014) BnWRI1 coordinates fatty acid biosynthesis and photosynthesis pathways during oil accumulation in rapeseed. J Integr Plant Biol 56: 582–593. doi: 10.1111/jipb.12158

Key words: BnWRI1, Brassica napus, oil accumulation, photosynthesis, transcription factor

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