Emerging trade-offs - impact of photoprotectants (PsbS, xanthophylls, and vitamin E) on oxylipins as regulators of development and defense

Barbara Demmig-Adams*, Christopher M. Cohu, Veronique Amiard, Guus van Zadelhoff, Gerrit A. Veldink, Onno Muller, William W. Adams

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

This review summarizes evidence for a mechanistic link between plant photoprotection and the synthesis of oxylipin hormones as regulators of development and defense. Knockout mutants of Arabidopsis, deficient in various key components of the chloroplast photoprotection system, consistently produced greater concentrations of the hormone jasmonic acid or its precursor 12-oxo-phytodienoic acid (OPDA), both members of the oxylipin messenger family. Characterized plants include several mutants deficient in PsbS (an intrinsic chlorophyll-binding protein of photosystem II) or pigments (zeaxanthin and/or lutein) required for photoprotective thermal dissipation of excess excitation energy in the chloroplast and a mutant deficient in reactive oxygen detoxification via the antioxidant vitamin E (tocopherol). Evidence is also presented that certain plant defenses against herbivores or pathogens are elevated for these mutants. This evidence furthermore indicates that wild-type Arabidopsis plants possess less than maximal defenses against herbivores or pathogens, and suggest that plant lines with superior defenses against abiotic stress may have lower biotic defenses. The implications of this apparent trade-off between abiotic and biotic plant defenses for plant ecology as well as for plant breeding/engineering are explored, and the need for research further addressing this important issue is highlighted.

Original languageEnglish
Pages (from-to)720-729
Number of pages10
JournalNew Phytologist
Volume197
Issue number3
DOIs
Publication statusPublished - Feb 2013

Keywords

  • defense
  • jasmonic acid (JA)
  • lutein
  • oxylipin
  • PsbS
  • vitamin E
  • xanthophyll
  • zeaxanthin
  • DEFICIENT ARABIDOPSIS MUTANT
  • VIOLAXANTHIN DE-EPOXIDASE
  • EXCESS LIGHT ENERGY
  • ALPHA-TOCOPHEROL
  • JASMONIC ACID
  • METHYL JASMONATE
  • GENE-EXPRESSION
  • CELL-DEATH
  • OXIDATIVE STRESS
  • REDOX REGULATION

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