Raffinose, an oligosaccharide found in many seeds, plays an important role in seed vigor; however, the regulatory mechanism governing raffinose biosynthesis remains unclear. We report here that maize W22 wild type (WT) seeds, but not W22 viviparous1 (zmvp1) mutant seeds, start accumulating galactinol and raffinose 28 days after pollination (DAP). Transcriptome analysis of the zmvp1 embryo showed that the expression of GALACTINOL SYNTHASE2 (GOLS2) was down-regulated relative to WT. Further experiments showed that the expression of ZmGOLS2 was up-regulated by ZmABI5 but not by ZmVP1, and it was further increased by the coexpression of ZmABI5 and ZmVP1 in maize protoplasts. ZmABI5 interacted with ZmVP1, while ZmABI5, but not ZmVP1, directly binds to the ZmGOLS2 promoter. Together, all of the findings suggest that ZmVP1 interacts with ZmABI5 and regulates ZmGOLS2 expression and raffinose accumulation in maize seeds.
|Number of pages||10|
|Journal||Journal of Agricultural and Food Chemistry|
|State||Published - Apr 17 2019|
Bibliographical noteFunding Information:
*E-mail: email@example.com. Tel: 86-13324517154. ORCID Tianyong Zhao: 0000-0002-1278-2842 Funding Research funding by the National Key Research and Development Plan (2018YFD0100901) and the NSFC (31671776) was awarded to T.Z. For LMAD and ABD, this work was supported by the USDA National Institute of Food and Agriculture, Hatch project 1002299. Notes The authors declare no competing financial interest.
© 2019 American Chemical Society.
- GALACTINOL SYNTHASE
- raffinose biosynthesis
ASJC Scopus subject areas
- Chemistry (all)
- Agricultural and Biological Sciences (all)