Brassinosteroid perception in the epidermis controls root meristem size

被引:278
作者
Hacham, Yael [1 ]
Holland, Neta [1 ]
Butterfield, Cristina [2 ]
Ubeda-Tomas, Susana [3 ]
Bennett, Malcolm J. [3 ]
Chory, Joanne [2 ,4 ]
Savaldi-Goldstein, Sigal [1 ,2 ]
机构
[1] Technion Israel Inst Technol, Fac Biol, IL-32000 Haifa, Israel
[2] Salk Inst Biol Studies, Plant Biol Lab, La Jolla, CA 92037 USA
[3] Univ Nottingham, Ctr Plant Integrat Biol, Loughborough LE12 5RD, Leics, England
[4] Salk Inst Biol Studies, Howard Hughes Med Inst, La Jolla, CA 92037 USA
来源
DEVELOPMENT | 2011年 / 138卷 / 05期
基金
英国生物技术与生命科学研究理事会; 以色列科学基金会;
关键词
Arabidopsis; Brassinosteroids; Growth; Cell proliferation; Cell-cell communication; ARABIDOPSIS ROOT; GENE-EXPRESSION; CELL-DIVISION; TRANSCRIPTION FACTORS; SIGNAL-TRANSDUCTION; QUIESCENT CENTER; AUXIN TRANSPORT; PLANT-GROWTH; KINASE; DIFFERENTIATION;
D O I
10.1242/dev.061804
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Multiple small molecule hormones contribute to growth promotion or restriction in plants. Brassinosteroids (BRs), acting specifically in the epidermis, can both drive and restrict shoot growth. However, our knowledge of how BRs affect meristem size is scant. Here, we study the root meristem and show that BRs are required to maintain normal cell cycle activity and cell expansion. These two processes ensure the coherent gradient of cell progression, from the apical to the basal meristem. In addition, BR activity in the meristem is not accompanied by changes in the expression level of the auxin efflux carriers PIN1, PIN3 and PIN7, which are known to control the extent of mitotic activity and differentiation. We further demonstrate that BR signaling in the root epidermis and not in the inner endodermis, quiescent center (QC) cells or stele cell files is sufficient to control root meristem size. Interestingly, expression of the QC and the stele-enriched MADS-BOX gene AGL42 can be modulated by BRI1 activity solely in the epidermis. The signal from the epidermis is probably transmitted by a different component than BES1 and BZR1 transcription factors, as their direct targets, such as DWF4 and BRox2, are regulated in the same cells that express BRI1. Taken together, our study provides novel insights into the role of BRs in controlling meristem size.
引用
收藏
页码:839 / 848
页数:10
相关论文
共 64 条
[1]   Gibberellin Signaling Controls Cell Proliferation Rate in Arabidopsis [J].
Achard, Patrick ;
Gusti, Andi ;
Cheminant, Soizic ;
Alioua, Malek ;
Dhondt, Stijn ;
Coppens, Frederik ;
Beemster, Gerrit T. S. ;
Genschik, Pascal .
CURRENT BIOLOGY, 2009, 19 (14) :1188-1193
[2]   STUNTED PLANT 1 mediates effects of cytokinin, but not of auxin, on cell division and expansion in the root of arabidopsis [J].
Beemster, GTS ;
Baskin, TI .
PLANT PHYSIOLOGY, 2000, 124 (04) :1718-1727
[3]   Analysis of cell division and elongation underlying the developmental acceleration of root growth in Arabidopsis thaliana [J].
Beemster, GTS ;
Baskin, TI .
PLANT PHYSIOLOGY, 1998, 116 (04) :1515-1526
[4]   Cell cycle:: the key to plant growth control? [J].
Beemster, GTS ;
Fiorani, F ;
Inzé, D .
TRENDS IN PLANT SCIENCE, 2003, 8 (04) :154-158
[5]   Local, efflux-dependent auxin gradients as a common module for plant organ formation [J].
Benková, E ;
Michniewicz, M ;
Sauer, M ;
Teichmann, T ;
Seifertová, D ;
Jürgens, G ;
Friml, J .
CELL, 2003, 115 (05) :591-602
[6]   A gene expression map of the Arabidopsis root [J].
Birnbaum, K ;
Shasha, DE ;
Wang, JY ;
Jung, JW ;
Lambert, GM ;
Galbraith, DW ;
Benfey, PN .
SCIENCE, 2003, 302 (5652) :1956-1960
[7]   The PIN auxin efflux facilitator network controls growth and patterning in Arabidopsis roots [J].
Blilou, I ;
Xu, J ;
Wildwater, M ;
Willemsen, V ;
Paponov, I ;
Friml, J ;
Heidstra, R ;
Aida, M ;
Palme, K ;
Scheres, B .
NATURE, 2005, 433 (7021) :39-44
[8]   BRL1 and BRL3 are novel brassinosteroid receptors that function in vascular differentiation in Arabidopsis [J].
Caño-Delgado, A ;
Yin, YH ;
Yu, C ;
Vafeados, D ;
Mora-García, S ;
Cheng, JC ;
Nam, KH ;
Li, JM ;
Chory, J .
DEVELOPMENT, 2004, 131 (21) :5341-5351
[9]   Root-specific CLE19 overexpression and the sol1/2 suppressors implicate a CLV-like pathway in the control of Arabidopsis root meristem maintenance [J].
Casamitjana-Martínez, E ;
Hofhuis, HF ;
Xu, J ;
Liu, CM ;
Heidstra, R ;
Scheres, B .
CURRENT BIOLOGY, 2003, 13 (16) :1435-1441
[10]   Brassinosteroids: Essential regulators of plant growth and development [J].
Clouse, SD ;
Sasse, JM .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1998, 49 :427-451