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Long distance RNA movement.

Julia Kehr1, Friedrich Kragler2

  • 1Biocenter Klein Flottbek, Molekulare Pflanzengenetik, University Hamburg, Ohnhorststr. 18, Hamburg 22609, Germany.

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Summary
This summary is machine-generated.

Plant phloem transports various RNA molecules, including messenger RNAs (mRNAs), over long distances. While small RNAs act as signals, the functions and selection mechanisms of mobile mRNAs remain under investigation.

Keywords:
tRNARNA-binding proteinsTranslationmRNA transportphloemplasmodesmatavasculaturevirus

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Area of Science:

  • Plant molecular biology
  • Plant physiology
  • RNA biology

Background:

  • The phloem in higher plants facilitates intercellular and long-distance transport of macromolecules.
  • Specialized plasmodesmata (PD) are hypothesized to mediate the entry of these macromolecules into phloem vessels.

Purpose of the Study:

  • To review the classes of mobile RNAs in plants.
  • To explore mechanisms of long-distance RNA transport.
  • To discuss the roles and potential functions of mobile RNAs, particularly mRNAs, in recipient cells.

Main Methods:

  • Analysis of phloem exudate composition.
  • Review of existing literature on RNA transport in various plant species (e.g., cucumber, pumpkin, Arabidopsis, grapevine).
  • Discussion of molecular mechanisms and evolutionary aspects of mobile RNAs.

Main Results:

  • Phloem exudate contains diverse RNA classes: small noncoding RNAs (siRNAs, miRNAs) and large RNAs (tRNAs, rRNAs, mRNAs).
  • Mobile small RNAs (siRNAs, miRNAs) function as signaling molecules.
  • Thousands of mRNAs have been detected moving long distances across graft junctions in multiple plant species.

Conclusions:

  • The transport and function of mobile mRNAs are not fully understood, especially their selection and roles in recipient tissues.
  • Mobile RNAs, including mRNAs, play roles in regulating transcription and translation in distant plant parts.
  • Further research is needed to elucidate the characteristics and evolutionary significance of mobile protein-encoding mRNAs.