Fatty acid unsaturation, mobilization, and regulation in the response of plants to stress

  • Upchurch R
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Stress acclimating plants respond to abiotic and biotic stress by remodeling membrane fluidity and by releasing alpha-linolenic (18:3) from membrane lipids. The modification of membrane fluidity is mediated by changes in unsaturated fatty acid levels, a function provided in part by the regulated activity of fatty acid desaturases. Adjustment of membrane fluidity maintains an environment suitable for the function of critical integral proteins during stress. alpha-Linolenic acid, released from membrane lipid by regulated lipase activity, is the precursor molecule for phyto-oxylipin biosynthesis. The modulation of chloroplast oleic acid (18:1) levels is central to the normal expression of defense responses to pathogens in Arabidopsis. Oleic (18:1) and linolenic (18:2) acid levels, in part, regulate development, seed colonization, and mycotoxin production by Aspergillus spp.

Author-supplied keywords

  • Abiotic and biotic stresses
  • Defense response
  • Fatty acids
  • Lipase
  • Membrane fluidity
  • Unsaturation
  • Δ-9 Stearoyl acyl carrier protein (ACP) desaturase
  • ω-3 Desaturase
  • ω-6 Desaturase

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  • Robert G. Upchurch

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