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Plant Cell DOI:10.1105/tpc.110.075721
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# ?& B6 K; P% U x) \$ p9 \Arabidopsis Tyrosylprotein Sulfotransferase Acts in the Auxin/PLETHORA Pathway in Regulating Postembryonic Maintenance of the Root Stem Cell Niche[W],[OA]7 n3 Z3 s [& a4 g+ ~2 @% z
Wenkun Zhoua,1, Lirong Weia,1, Jian Xub,c, Qingzhe Zhaia, Hongling Jianga, Rong Chena, Qian Chena, Jiaqiang Suna, Jinfang Chua, Lihuang Zhua, Chun-Ming Liud and Chuanyou Lia,2
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a State Key Laboratory of Plant Genomics, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China J5 ?( ]. k9 u/ H" d; s
b National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China
$ a! w& h$ R# nc Department of Biological Sciences, National University of Singapore, Singapore 117543
, I( B8 Q! s: R: F6 {" }2 Nd Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China , y& O5 t% f" g5 ?! c3 i* k2 V
W5 T; k* V# C; U$ f" @+ `Recent identification of the Arabidopsis thaliana tyrosylprotein sulfotransferase (TPST) and a group of Tyr-sulfated peptides known as root meristem growth factors (RGFs) highlights the importance of protein Tyr sulfation in plant growth and development. Here, we report the action mechanism of TPST in maintenance of the root stem cell niche, which in the Arabidopsis root meristem is an area of four mitotically inactive quiescent cells plus the surrounding mitotically active stem cells. Mutation of TPST leads to defective maintenance of the root stem cell niche, decreased meristematic activity, and stunted root growth. We show that TPST expression is positively regulated by auxin and that mutation of this gene affects auxin distribution by reducing local expression levels of several PIN genes and auxin biosynthetic genes in the stem cell niche region. We also show that mutation of TPST impairs basal- and auxin-induced expression of the PLETHORA (PLT) stem cell transcription factor genes and that overexpression of PLT2 rescues the root meristem defects of the loss-of-function mutant of TPST. Together, these results support that TPST acts to maintain root stem cell niche by regulating basal- and auxin-induced expression of PLT1 and PLT2. TPST-dependent sulfation of RGFs provides a link between auxin and PLTs in regulating root stem cell niche maintenance. |
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