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The Cell Cycle Control System

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...

The Cell Cycle Control System

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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...

Positive Regulator Molecules

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To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.

Positive Regulator Molecules

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.

Molecular Factors Affecting Cell Division

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Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
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Negative Regulator Molecules

Negative Regulator Molecules

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Updated: Oct 27, 2025

The Cell-based L-Glutathione Protection Assays to Study Endocytosis and Recycling of Plasma Membrane Proteins

The Cell-based L-Glutathione Protection Assays to Study Endocytosis and Recycling of Plasma Membrane Proteins

Published on: December 13, 2013

Guard cell regulation: pulling the strings behind the scenes.

João Antonio Siqueira¹, Hellen Oliveira de Oliveira¹, Adriano Nunes-Nesi¹

¹Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.

Trends in Plant Science

|July 25, 2021

Summary

This summary is machine-generated.

Precise stomatal regulation is vital for plant growth, particularly during drought. New research reveals key mechanisms involving microtubule dynamics and energy sensing in guard cells, enhancing our understanding of plant responses to environmental changes.

Keywords:

GABA metabolism microtubules stomata

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Area of Science:

Plant Physiology
Molecular Biology
Environmental Science

Background:

Stomatal regulation is crucial for plant survival, influencing gas exchange and water balance.
Drought stress poses a significant challenge to plant growth and agricultural productivity.
Understanding guard cell mechanisms is key to improving plant resilience.

Purpose of the Study:

To elucidate novel mechanisms governing stomatal physiology under dynamic environmental conditions.
To investigate the roles of microtubule dynamics and energy sensing in guard cell function.
To provide insights into plant adaptation strategies during drought stress.

Main Methods:

Analysis of recent studies by Dou et al. and Xu et al.
Focus on molecular and cellular processes within plant guard cells.
Investigating responses to environmental stimuli, particularly drought.

Main Results:

Identification of novel regulatory pathways in stomatal control.
Demonstration of the importance of microtubule dynamics in stomatal movement.
Highlighting the role of cellular energy sensing in guard cell responses.
Linking these mechanisms to plant adaptation under drought.

Conclusions:

Microtubule dynamics and energy sensing are critical for precise stomatal regulation.
These findings offer new targets for enhancing plant drought tolerance.
The research advances our fundamental knowledge of plant environmental responses.