scholarly journals Re-induction of the cell cycle in the Arabidopsis post-embryonic root meristem is ABA-insensitive, GA-dependent and repressed by KRP6

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jeroen Nieuwland ◽  
Petra Stamm ◽  
Bo Wen ◽  
Ricardo S. Randall ◽  
James A. H. Murray ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Root Meristem ◽  
Aba Insensitive ◽  
Embryonic Root

scholarly journals Redox Changes During the Cell Cycle in the Embryonic Root Meristem of Arabidopsis thaliana

2017 ◽  
Vol 27 (18) ◽  
pp. 1505-1519 ◽  
Author(s):  
Ambra de Simone ◽  
Rachel Hubbard ◽  
Natanael Viñegra de la Torre ◽  
Yazhini Velappan ◽  
Michael Wilson ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Arabidopsis Thaliana ◽  
Root Meristem ◽  
Embryonic Root

An analysis of the mitotic cell cycle in the root meristem of Zea mays

1973 ◽  
Vol 183 (1073) ◽  
pp. 385-398 ◽  
Keyword(s):  
Cell Cycle ◽  
Zea Mays ◽  
Root Meristem ◽  
Mitotic Cell ◽  
Mitotic Cell Cycle ◽  
Pulse Labelling ◽  
Quiescent Centre ◽  
Proliferating Cells ◽  
Average Delay ◽  
The Mean

A pulse labelling experiment was used to study the mitotic cell cycle of proliferating cells throughout the root meristem of Zea mays . Seventeen different regions were identified within the area of proliferative activity, extending from the initial cells of the cap columella up to the stele, cortex and epidermis 1000 μm from the cap-quiescent centre junction, and the data were analysed for each region separately. The analyses were made in terms of a mathematical model for cell proliferation and yield statistically efficient estimates of the cell-cycle parameters. The validity of the model is discussed in some detail. It appears that the main difference between the regions studied is in the mean duration of G 1 , that is, the average delay a newborn cell experiences before it begins to synthesize DNA. The mean durations of S and G 2 , the DNA-synthetic and post-DNA-synthetic phases of the mitotic cycle, are relatively constant. The one exception to this pattern is the quiescent centre; this region includes a relatively high proportion of slowly dividing and non-proliferating cells.

scholarly journals Bootstrapping and Pinning down the Root Meristem; the Auxin–PLT–ARR Network Unites Robustness and Sensitivity in Meristem Growth Control

2021 ◽  
Vol 22 (9) ◽  
pp. 4731
Author(s):  
Jacob P. Rutten ◽  
Kirsten H. Ten Tusscher
Keyword(s):  
Regulatory Network ◽  
Root Meristem ◽  
Response Regulator ◽  
Plant Root ◽  
Growth Control ◽  
Size Control ◽  
Functional Constraints ◽  
Interaction Domain ◽  
Meristem Size ◽  
Embryonic Root

After germination, the meristem of the embryonic plant root becomes activated, expands in size and subsequently stabilizes to support post-embryonic root growth. The plant hormones auxin and cytokinin, together with master transcription factors of the PLETHORA (PLT) family have been shown to form a regulatory network that governs the patterning of this root meristem. Still, which functional constraints contributed to shaping the dynamics and architecture of this network, has largely remained unanswered. Using a combination of modeling approaches we reveal how the interplay between auxin and PLTs enables meristem activation in response to above-threshold stimulation, while its embedding in a PIN-mediated auxin reflux loop ensures localized PLT transcription and thereby, a finite meristem size. We furthermore demonstrate how this constrained PLT transcriptional domain enables independent control of meristem size and division rates, further supporting a division of labor between auxin and PLT. We subsequently reveal how the weaker auxin antagonism of the earlier active Arabidopsis response regulator 12 (ARR12) may arise from the absence of a DELLA protein interaction domain. Our model indicates that this reduced strength is essential to prevent collapse in the early stages of meristem expansion while at later stages the enhanced strength of Arabidopsis response regulator 1 (ARR1) is required for sufficient meristem size control. Summarizing, our work indicates that functional constraints significantly contribute to shaping the auxin–cytokinin–PLT regulatory network.

Microgravity modifies the cell cycle in the lentil root meristem

1998 ◽  
Vol 21 (8-9) ◽  
pp. 1165 ◽  
Author(s):  
D. Driss-Ecole ◽  
F. Yu ◽  
V. Legué ◽  
G. Perbal
Keyword(s):  
Cell Cycle ◽  
Root Meristem
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