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Related Concept Videos

Primary and Secondary Growth in Roots and Shoots03:02

Primary and Secondary Growth in Roots and Shoots

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Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Meristems and Plant Growth02:36

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Plants grow throughout their lives; this is called indeterminate growth, and it distinguishes plants from most animals. Although certain parts of plants stop growing (e.g., leaves and flowers), others grow continuously—like roots and stems.
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Related Experiment Video

Updated: Jan 25, 2026

Time-lapse Fluorescence Imaging of Arabidopsis Root Growth with Rapid Manipulation of The Root Environment Using The RootChip
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β-Cyclocitral is a conserved root growth regulator.

Alexandra J Dickinson1,2,3, Kevin Lehner1, Jianing Mi4

  • 1Department of Biology, Duke University, Durham, NC 27708.

Proceedings of the National Academy of Sciences of the United States of America
|May 10, 2019
PubMed
Summary

β-Cyclocitral, a natural compound, promotes root growth and branching in plants. This discovery offers a new strategy for improving crop resilience to environmental stressors like salt contamination.

Keywords:
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Area of Science:

  • Plant Biology
  • Metabolomics
  • Agricultural Science

Background:

  • Enhancing crop stress tolerance through improved root systems is crucial for food security.
  • Identifying natural compounds that regulate root development is an active area of research.

Purpose of the Study:

  • To identify natural metabolites that regulate root traits, specifically root depth and branching.
  • To investigate the potential of β-Cyclocitral as a tool for enhancing crop stress tolerance.

Main Methods:

  • A sensitized screen was employed to identify root-regulating metabolites in *Arabidopsis*.
  • The effects of β-Cyclocitral on root meristematic cell divisions and lateral root branching were analyzed.
  • Conserved effects were tested in tomato and rice, including under salt stress conditions.

Main Results:

  • β-Cyclocitral was identified as an endogenous compound that promotes root meristem cell division and lateral root branching.
  • Its effects on root growth were independent of known plant hormone signaling pathways (auxin, brassinosteroid, ROS).
  • β-Cyclocitral demonstrated conserved efficacy in tomato and rice, leading to more compact root systems in rice and enhanced vigor under salt stress.

Conclusions:

  • β-Cyclocitral is a broadly effective root growth promoter in both monocots and eudicots.
  • It holds potential as a valuable tool for enhancing crop vigor and stress tolerance in agriculture.