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Related Experiment Videos

Stress-responsive alpha-dioxygenase expression in tomato roots.

Ananchanok Tirajoh1, Theingi S T Aung, Ashley Byun McKay

  • 1Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6.

Journal of Experimental Botany
|December 25, 2004
PubMed
Summary

Alpha-dioxygenase (alpha-DOX) enzymes generate protective oxylipins. In tomato, LEalpha-DOX1 expression increases with salt stress, suggesting a role in root defense mechanisms.

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Area of Science:

  • Plant biochemistry and molecular biology
  • Oxylipin metabolism and function
  • Stress response in plants

Background:

  • Alpha-dioxygenase (alpha-DOX) enzymes oxygenate fatty acids, producing oxylipins with protective functions against oxidative damage.
  • Oxylipins are a newly identified class of signaling molecules with diverse physiological roles.
  • Plant responses to environmental stresses often involve complex signaling pathways and gene regulation.

Purpose of the Study:

  • To investigate the role of alpha-dioxygenase (alpha-DOX) enzymes in tomato (Lycopersicon esculentum Mill.) response to salt stress.
  • To identify and characterize members of the alpha-DOX gene family in tomato.
  • To elucidate the regulatory mechanisms controlling alpha-DOX gene expression under various stress conditions.

Main Methods:

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  • Differential display of mRNA to identify salt-regulated genes.
  • Gene family analysis to identify alpha-DOX members (LEalpha-DOX1, -2, -3).
  • Quantitative expression analysis of LEalpha-DOX1 in response to salt, wounding, pathogen challenge, abscisic acid (ABA), ethylene, and fluridone (FLU).

Main Results:

  • Alpha-dioxygenase (alpha-DOX) was identified as a salt-regulated gene family in tomato, with LEalpha-DOX1 being salt-responsive.
  • LEalpha-DOX1 expression was enhanced by salt, wounding, and Pythium aphanidermatum challenge in roots.
  • LEalpha-DOX1 expression was ABA-responsive, but salt-responsive expression was not affected in ABA-deficient mutants, suggesting ABA's role in suppressing ethylene accumulation.
  • Ethylene significantly elevated LEalpha-DOX1 expression, an effect suppressed by ABA, indicating ABA's potential role in enhanced alpha-DOX expression under salt stress.

Conclusions:

  • Alpha-dioxygenase (alpha-DOX) generated oxylipins may mediate tomato root responses to environmental stresses like salt, wounding, and pathogen attack.
  • LEalpha-DOX1 is a key player in the salt stress response pathway in tomato roots.
  • Abscisic acid (ABA) and ethylene signaling pathways interact to regulate LEalpha-DOX1 expression under osmotic stress.