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Related Concept Videos

Cell Signaling in Plants01:25

Cell Signaling in Plants

Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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A signaling cascade is a series of events that facilitates the transmission of information within or between cells, culminating in a targeted response in the recipient cell. As chemical messengers, hormones are pivotal in initiating and modulating these intricate signaling cascades based on their solubility.
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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
Endocrine Signaling01:45

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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.

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High Resolution Quantification of Crystalline Cellulose Accumulation in Arabidopsis Roots to Monitor Tissue-specific Cell Wall Modifications
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Small-molecule dissection of brassinosteroid signaling.

Mirela-Corina Codreanu1, Dominique Audenaert, Long Nguyen

  • 1Department of Plant Systems Biology, VIB, Ghent, Belgium.

Methods in Molecular Biology (Clifton, N.J.)
|May 12, 2012
PubMed
Summary

Researchers used chemical genetics to find small molecules impacting brassinosteroid (BR) hormone responses in Arabidopsis. These compounds helped reveal how endomembrane trafficking of the BR receptor is crucial for plant growth signaling.

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Area of Science:

  • Plant biology
  • Molecular signaling
  • Chemical genetics

Background:

  • Brassinosteroids (BRs) are key plant growth hormones.
  • BR signaling involves cell surface receptor kinases and intracellular cascades.
  • Endomembrane trafficking, particularly endosomal localization of BR receptors, modulates BR responses.

Purpose of the Study:

  • To identify novel small molecules affecting BR signaling using chemical genetics.
  • To investigate the role of endomembrane trafficking in BR signal transduction.
  • To dissect the dynamic process of endocytosis in the context of BR responses.

Main Methods:

  • Screening of Arabidopsis thaliana seedlings for small molecules impacting hypocotyl elongation under continuous light.
  • Utilizing identified compounds to study endomembrane trafficking of the BR receptor, BR INSENSITIVE1 (BRI1).
  • Employing chemical genetics to analyze dynamic cellular processes like endocytosis.

Main Results:

  • A screen identified small molecules that modulate hypocotyl elongation, indicating effects on BR signaling.
  • These compounds were instrumental in dissecting the endomembrane trafficking pathways of the BRI1 receptor.
  • The study highlights the essential role of endomembrane trafficking in BR signal transduction.

Conclusions:

  • Chemical genetics is effective for discovering components in complex signaling networks.
  • Endomembrane trafficking of the BR receptor BRI1 is a critical regulatory step in BR signaling.
  • Understanding these trafficking dynamics provides insights into plant growth regulation.