Activation of CYCD7;1 in the central cell and early endosperm overcomes cell-cycle arrest in the Arabidopsis female gametophyte, and promotes early endosperm and embryo development.

ABSTRACT: In angiosperms, double fertilization of the egg and central cell of the megagametophyte leads to the development of the embryo and endosperm, respectively. Control of cell cycle progression in the megagametophyte is essential for successful fertilization and development. Central cell-targeted expression of the D-type cyclin CYCD7;1 (end CYCD7;1) using the imprinted FWA promoter overcomes cycle arrest of the central cell in the Arabidopsis female gametophyte in the unfertilized ovule, leading to multinucleate central cells at high frequency. Unlike FERTILIZATION-INDEPENDENT SEED (fis) mutants, but similar to lethal RETINOBLASTOMA-RELATED (rbr) mutants, no seed coat development is triggered. Unlike the case with loss of rbr, post-fertilization end CYCD7;1 in the endosperm enhances the number

SUBMITTER: Sornay E 

PROVIDER: S-EPMC5102630 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature