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Phloem-Mobile RNAs as Systemic Signaling Agents.

Byung-Kook Ham1, William J Lucas1

  • 1Department of Plant Biology, College of Biological Sciences, University of California, Davis, California 95616; email: bham@ucdavis.edu , wjlucas@ucdavis.edu.

Annual Review of Plant Biology
|January 27, 2017
PubMed
Summary

Plant vascular systems use mobile RNAs to signal between organs, influencing growth, defense, and crop yield. These RNA molecules are crucial for coordinating plant development and responding to environmental changes.

Keywords:
RNA long-distance transportepigenetic regulationgenome stabilityphloemsieve tube systemsystemic signaling

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • The plant vascular system facilitates physiological coordination via nutrient and signal transport.
  • Angiosperm phloem sieve tubes transport diverse RNA species, including thousands of mRNAs.
  • Ribonucleoprotein complexes stabilize RNA for systemic translocation.

Purpose of the Study:

  • To review recent advancements in understanding phloem and plasmodesmal transport.
  • To explore the role of phloem-mobile RNAs in plant communication and gene regulation.
  • To highlight the significance of mobile RNAs in development, defense, and crop improvement.

Main Methods:

  • Grafting studies to trace RNA movement.
  • Transcriptomics to identify mobile RNAs.
  • Review of existing literature on phloem transport and RNA function.

Main Results:

  • Thousands of mRNAs are translocated long distances from source to sink tissues.
  • Phloem-mobile small RNAs influence epigenetic events like meristem development and genome stability.
  • Mobile mRNAs are delivered to specific tissues, mediating responses to environmental cues.

Conclusions:

  • Phloem-mobile RNAs are integral to local and systemic plant communication networks.
  • These RNAs act as critical components in gene regulatory networks governing plant growth, defense, and yield.
  • Understanding mobile RNA transport is key to enhancing crop performance and resilience.