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- Title
The VQ motif protein IKU1 regulates endosperm growth and seed size in Arabidopsis.
- Authors
Aihua Wang; Garcia, Damien; Hongyu Zhang; Ke Feng; Chaudhury, Abed; Berger, Fred; Peacock, William James; Dennis, Elizabeth S.; Ming Luo
- Abstract
Arabidopsis seed size is regulated by the IKU pathway that includes IKU2 (a leucine-rich repeat kinase) and MINI3 (a WRKY transcription factor). We report the cloning of the IKU1 ( At2g35230) gene. iku1 mutants cause reduced endosperm growth and the production of small seeds. IKU1 encodes a protein containing a VQ motif, which is a motif specific to plants. IKU1 is expressed in the early endosperm and its progenitor, the central cell. Restoration of IKU1 function in the endosperm is sufficient to rescue seed size. A genomic construct carrying mutations in the VQ motif failed to complement the iku1 mutation, suggesting an essential role for the VQ motif. IKU1 interacts with MINI3 in the yeast two-hybrid system, consistent with an IKU1 function in the IKU-MINI pathway. Our data support the proposition that endosperm development is an important determinant of seed size.
- Publication
Plant Journal, 2010, Vol 63, Issue 4, p670
- ISSN
0960-7412
- Publication type
Academic Journal
- DOI
10.1111/j.1365-313X.2010.04271.x