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Evolutionarily New Solanaceous DCL2 Family Members Acquire Functions in Tomato.

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|November 10, 2025
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Summary

Plant RNA silencing, a key defense against viruses, involves Dicer-like proteins (DCLs) generating small RNAs (sRNAs). This study reveals expanded DCL2 gene functions in tomato, crucial for combating viroids and viral pathogens.

Keywords:
Dicer‐like 2 (DCL2)plant virustomatoviroid

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Area of Science:

  • Plant Molecular Biology
  • Virology
  • Genetics

Background:

  • RNA silencing is a crucial plant defense mechanism against viral pathogens, mediated by Dicer-like proteins (DCLs) and small RNAs (sRNAs).
  • While well-studied in Arabidopsis, diverse silencing components exist in crops, particularly Solanaceae.
  • Understanding these variations is key to improving crop resistance.

Purpose of the Study:

  • To investigate the evolutionary expansion and functional roles of solanaceous-specific Dicer-like 2 (DCL2) genes.
  • To determine the involvement of DCL2 genes in antiviral defense in tomato plants.
  • To explore the characteristics and function of unusual short viral small RNAs.

Main Methods:

  • Gene family expansion analysis of DCL2 in Solanaceae.
  • Viral challenge assays in tomato plants (cv. Heinz 1706) infected with potato spindle tuber viroid (PSTVd).
  • Analysis of viral small RNA populations and functional assays using synthetic small interfering RNAs.

Main Results:

  • Identified an evolutionarily recent copy of DCL2 (DCL2a) in tomato.
  • DCL2b showed pathogen-inducible expression, varying by cultivar and virus.
  • Both DCL2a and DCL2b were essential for suppressing PSTVd accumulation.
  • Observed unusually short viral small RNAs (16-19 nt) that contribute to RNA silencing, but are inhibited by viral suppressors like P19.

Conclusions:

  • The DCL2 gene family has expanded functionally within the Solanaceae.
  • Tomato DCL2a and DCL2b play critical roles in antiviral and subviral agent defense.
  • Short viral small RNAs represent an additional layer of RNA silencing, subject to viral counter-defense.