scholarly journals TIME FOR COFFEE controls root meristem size by changes in auxin accumulation in Arabidopsis

2013 ◽  
Vol 65 (1) ◽  
pp. 275-286 ◽  
Author(s):  
Li-Wei Hong ◽  
Da-Wei Yan ◽  
Wen-Cheng Liu ◽  
Hong-Guo Chen ◽  
Ying-Tang Lu
Keyword(s):  
Root Meristem ◽  
Meristem Size ◽  
Auxin Accumulation

scholarly journals Salt Stress Reduces Root Meristem Size by Nitric Oxide-Mediated Modulation of Auxin Accumulation and Signaling in Arabidopsis

2015 ◽  
Vol 168 (1) ◽  
pp. 343-356 ◽  
Author(s):  
Wen Liu ◽  
Rong-Jun Li ◽  
Tong-Tong Han ◽  
Wei Cai ◽  
Zheng-Wei Fu ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Salt Stress ◽  
Root Meristem ◽  
Meristem Size ◽  
Auxin Accumulation

scholarly journals Brassinosteroid perception in the epidermis controls root meristem size

Development ◽  
2011 ◽  
Vol 138 (5) ◽  
pp. 839-848 ◽  
Author(s):  
Y. Hacham ◽  
N. Holland ◽  
C. Butterfield ◽  
S. Ubeda-Tomas ◽  
M. J. Bennett ◽  
...  
Keyword(s):  
Root Meristem ◽  
Meristem Size

scholarly journals Cytokinin-induced promotion of root meristem size in the fernAzollasupports a shoot-like origin of euphyllophyte roots

2015 ◽  
Vol 209 (2) ◽  
pp. 705-720 ◽  
Author(s):  
Jan de Vries ◽  
Angela Melanie Fischer ◽  
Mayo Roettger ◽  
Sophie Rommel ◽  
Henriette Schluepmann ◽  
...  
Keyword(s):  
Root Meristem ◽  
Meristem Size

scholarly journals ABA represses TOR and root meristem activity through nuclear exit of the SnRK1 kinase

2021 ◽  
Author(s):  
Borja Belda-Palazon ◽  
Monica Costa ◽  
Tom Beeckman ◽  
Filip Rolland ◽  
Elena Baena-Gonzalez
Keyword(s):  
Cell Proliferation ◽  
Nuclear Export ◽  
Growth Regulation ◽  
Root Meristem ◽  
Plant Tolerance ◽  
Proliferation Zone ◽  
Meristem Size ◽  
Main Driver ◽  
Root Meristematic Cells ◽  
Underlying Mechanisms

The phytohormone abscisic acid (ABA) promotes plant tolerance to major stresses like drought, partly by modulating plant growth and development. However, the underlying mechanisms are poorly understood. Here, we show that cell proliferation in the Arabidopsis thaliana root meristem is controlled by the interplay between three kinases, SNF1-RELATED KINASE 2 (SnRK2), the main driver of ABA signaling, the SnRK1 energy sensor, and the growth-promoting TARGET OF RAPAMYCIN (TOR) kinase. Under favorable conditions, the SnRK1α1 catalytic subunit is enriched in the nuclei of root meristematic cells and this is accompanied by normal cell proliferation and meristem size. Depletion of SnRK2s in a snrk2.2 snrk2.3 double mutant causes constitutive cytoplasmic localization of SnRK1α1 and a reduction in meristem size, suggesting that, under non-stress conditions, SnRK2s enable growth by retaining SnRK1α1 in the nucleus. In response to elevated ABA levels, SnRK1α1 translocates to the cytoplasm and this is accompanied by inhibition of TOR, decreased cell proliferation and meristem size. Blocking nuclear export with leptomycin B abrogates ABA-driven SnRK1α1 relocalization to the cytoplasm and the inhibition of TOR. Fusion of SnRK1α1 to an SV40 nuclear localization signal leads to defective TOR repression in response to ABA, demonstrating that SnRK1α1 nuclear exit is a premise for this repression. Finally, the SnRK2-dependent changes in SnRK1α1 subcellular localization are specific to the proliferation zone of the meristem, underscoring the relevance of this mechanism for growth regulation.

scholarly journals Root meristem growth factor 1 controls root meristem size through reactive oxygen species signaling

2018 ◽  
Author(s):  
Masashi Yamada ◽  
Xinwei Han ◽  
Philip. N. Benfey
Keyword(s):  
Reactive Oxygen Species ◽  
Transcription Factor ◽  
Stem Cell ◽  
Growth Factor ◽  
Root Meristem ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Meristem Size ◽  
Essential Question ◽  
Meristem Development

AbstractStem cell niche and root meristem size are maintained by intercellular interactions and signaling networks of a plant peptide hormone, Root Meristem Growth Factor 1 (RGF1). How RGF1 regulates root meristem development is an essential question to understand stem cell function. Although five receptors of RGF1 have recently been identified, the downstream signaling mechanism remains unknown. Here, we report a series of signaling events following RGF1 action. The RGF1-receptor pathway controls distribution of reactive oxygen species (ROS) along the developmental zones of the Arabidopsis root. We identify a novel transcription factor, RGF1 INDUCIBLE TRANSCRIPTION FACTOR 1 (RITF1), which plays a central role in mediating RGF1 signaling. Manipulating RITF1 expression leads to redistribution of ROS along the root developmental zones. Changes in ROS distribution, in turn, enhance the stability of the PLETHORA2 (PLT2) protein, a master regulator of root stem cells. Taken together, our study clearly depicts a signaling cascade initiated by RGF1 and links the RGF1 peptide to ROS regulatory mechanisms.

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