RRC ID 30736
著者 Kong Y, Zhu Y, Gao C, She W, Lin W, Chen Y, Han N, Bian H, Zhu M, Wang J.
タイトル Tissue-specific expression of SMALL AUXIN UP RNA41 differentially regulates cell expansion and root meristem patterning in Arabidopsis.
ジャーナル Plant Cell Physiol
Abstract Among the three primary auxin-induced gene families, Auxin/Indole-3-Acetic Acid (Aux/IAA), Gretchen Hagen3 (GH3) and SMALL AUXIN UP RNA (SAUR), the function of SAUR genes remains unclear. Arabidopsis SAUR genes have been phylogenetically classified into three clades. Recent work has suggested that SAUR19 (clade II) and SAUR63 (clade I) promote cell expansion through the modulation of auxin transport. Herein, we present our work on SAUR41, a clade III SAUR gene with a distinctive expression pattern in root meristems. SAUR41 was normally expressed in the quiescent center and cortex/endodermis initials; upon auxin stimulation, the expression was provoked in the endodermal layer. During lateral root development, SAUR41 was expressed in prospective stem cell niches of lateral root primordia and in expanding endodermal cells surrounding the primordia. SAUR41-EGFP (enhanced green fluorescent protein) fusion proteins localized to the cytoplasm. Overexpression of SAUR41 from the Cauliflower mosaic virus 35S promoter led to pleiotropic auxin-related phenotypes, including long hypocotyls, increased vegetative biomass and lateral root development, expanded petals and twisted inflorescence stems. Ectopic SAUR41 proteins were able to promote auxin transport in hypocotyls. Tissue-specific expression of SAUR41 from the PIN1, WOX5, PLT2 and ACR4 promoters induced the formation of new auxin accumulation/signaling peaks above the quiescent centers, whereas tissue-specific expression of SAUR41 from the PIN2 and PLT2 promoters enhanced root gravitropic growth. Cells in the root stem cell niches of these transgenic seedlings were differentially enlarged. The distinctive expression pattern of the SAUR41 gene and the explicit function of SAUR41 proteins implied that further investigations on the loss-of-function phenotypes of this gene in root development and environmental responses are of great interest.
巻・号 54(4)
ページ 609-21
公開日 2013-4-1
DOI 10.1093/pcp/pct028
PII pct028
PMID 23396598
MeSH Arabidopsis / cytology Arabidopsis / genetics Arabidopsis / metabolism* Arabidopsis Proteins / genetics Arabidopsis Proteins / metabolism* Gene Expression Regulation, Plant / genetics Gene Expression Regulation, Plant / physiology Indoleacetic Acids Meristem / cytology* Meristem / metabolism* Plant Roots / genetics Plant Roots / metabolism* Plants, Genetically Modified / cytology Plants, Genetically Modified / genetics Plants, Genetically Modified / metabolism
IF 4.062
引用数 54
WOS 分野 PLANT SCIENCES CELL BIOLOGY
リソース情報
シロイヌナズナ / 植物培養細胞・遺伝子 pst11030 pst17947