This Article Full Text Full Text (PDF) PPT slides of all figures Supplemental Data All Versions of this Article: 21/1/106    most recent tpc.108.064972v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (2) Citing Articles via Google Scholar Google Scholar Articles by Zhou, Y. Articles by Ni, M. Search for Related Content PubMed PubMed Citation Articles by Zhou, Y. Articles by Ni, M. Agricola Articles by Zhou, Y. Articles by Ni, M.

SHORT HYPOCOTYL UNDER BLUE1 Associates with MINISEED3 and HAIKU2 Promoters in Vivo to Regulate Arabidopsis Seed Development^[W]

^a Department of Plant Biology, University of Minnesota, St. Paul, Minnesota 55108
^b State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong, 271018, P.R. China

² Address correspondence to nixxx008{at}tc.umn.edu and zhangxs{at}sdau.edu.cn.

Seed development in Arabidopsis thaliana undergoes an initial phase of endosperm proliferation followed by a second phase in which the embryo grows at the expense of the endosperm. As mature seed size is largely attained during the initial phase, seed size is coordinately determined by the growth of the maternal ovule, endosperm, and embryo. Here, we identify SHORT HYPOCOTYL UNDER BLUE1 (SHB1) as a positive regulator of Arabidopsis seed development that affects both cell size and cell number. shb1-D, a gain-of-function overexpression allele, increases seed size, and shb1, a loss-of-function allele, reduces seed size. SHB1 is transmitted zygotically. The increase in shb1-D seed size is associated with endosperm cellurization, chalazal endosperm enlargement, and embryo development. SHB1 is required for the proper expression of two other genes that affect endosperm development, MINISEED3 (MINI3) and HAIKU2 (IKU2), a WRKY transcription factor gene and a leucine-rich repeat receptor kinase gene. SHB1 associates with both MINI3 and IKU2 promoters in vivo. SHB1 may act with other proteins that bind to MINI3 and IKU2 promoters to promote a large seed cavity and endosperm growth in the early phase of seed development. In the second phase, SHB1 enhances embryo cell proliferation and expansion through a yet unknown IKU2-independent pathway.

This article has been cited by other articles:

				D. Secco, A. Baumann, and Y. Poirier Characterization of the Rice PHO1 Gene Family Reveals a Key Role for OsPHO1;2 in Phosphate Homeostasis and the Evolution of a Distinct Clade in Dicotyledons Plant Physiology, March 1, 2010; 152(3): 1693 - 1704. [Abstract] [Full Text] [PDF]

				H. Rouached, A. B. Arpat, and Y. Poirier Regulation of Phosphate Starvation Responses in Plants: Signaling Players and Cross-Talks Mol Plant, February 8, 2010; (2010) ssp120v1. [Abstract] [Full Text] [PDF]

				N. Takano-Kai, H. Jiang, T. Kubo, M. Sweeney, T. Matsumoto, H. Kanamori, B. Padhukasahasram, C. Bustamante, A. Yoshimura, K. Doi, et al. Evolutionary History of GS3, a Gene Conferring Grain Length in Rice Genetics, August 1, 2009; 182(4): 1323 - 1334. [Abstract] [Full Text] [PDF]