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ROOT HAIR DEFECTIVE SIX ‐ LIKE 4 ( RSL 4) promotes root hair elongation by transcriptionally regulating the expression of genes required for cell growth
Author(s) -
Vijayakumar Priya,
Datta Sourav,
Dolan Liam
Publication year - 2016
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14095
Subject(s) - root hair , biology , microbiology and biotechnology , gene , arabidopsis thaliana , arabidopsis , gene expression , elongation , genetics , mutant , materials science , metallurgy , ultimate tensile strength
SummaryROOT HAIR DEFECTIVE SIX‐LIKE 4 ( RSL 4) is necessary and sufficient for root hair elongation in Arabidopsis thaliana . Root hair length is determined by the duration for which RSL 4 protein is present in the developing root hair. The aim of this research was to identify genes regulated by RSL 4 that affect root hair growth. To identify genes regulated by RSL 4, we identified genes whose expression was elevated by induction of RSL 4 activity in the presence of an inhibitor of translation. Thirty‐four genes were identified as putative targets of RSL transcriptional regulation, and the results suggest that the activities of SUPPRESSOR OF ACTIN ( SAC 1), EXOCSYT SUBUNIT 70A1 ( EXO 70A1), PEROXIDASE 7 ( PRX 7) and CALCIUM ‐ DEPENDENT PROTEIN KINASE 11 ( CPK 11) are required for root hair elongation. These data indicate that RSL 4 controls cell growth by controlling the expression of genes encoding proteins involved in cell signalling, cell wall modification and secretion.