Regulation of desaturase gene expression, changes in membrane lipid composition and freezing tolerance in potato plants

Monica De Palma, Stefania Grillo, Immacolata Massarelli, Antonello Costa, G. Balogh, L. Vígh, Antonella Leone

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

Irreversible damage of the plant plasma membrane is the primary cause of freezing injury. Changes in lipid unsaturation have being largely studied as one of the major components aimed at preserving the integrity and functionality of plasma membranes, and increasing freezing tolerance. In the present study, the potato stearoyl-ACP desaturase (ω-9) gene, encoding the first enzyme involved in plant lipid unsaturation, was cloned and used to monitor its expression during cold acclimation in plants of two Solanum species, known to differ in their ability to cold acclimate. Although up-regulated upon cold acclimation in both potato species, freezing tolerant S. commersonii plants had a constitutive level of the ω-9 desaturase gene transcripts and of other known stress protective proteins (dhn2 and cpn60β) remarkably higher than plants of the not freezing tolerant potato species (S. tuberosum). Transcript levels of oleoyl-desaturase (ω-6) and linoleyl CoA desaturase (ω-3), microsomal desaturases involved in further plasma membrane fatty acid (FA) unsaturation, did not vary appreciably during cold acclimation in both potato species. S. tuberosum potato plants overexpressing the ω-9 desaturase gene were generated, to change FA lipid composition and measure the effect on the basal level freezing tolerance of cultivated potato varieties. Unsaturation level of total leaf polar lipids of one of best ω-9 desaturase overexpressing line, with a high transcript level of the exogenous gene and related protein, was slightly higher compared to potato plants transformed with the empty vector, with the notable appearance of cis-vaccenic acid (C18:1 Δ11), an unusual monoic FAs in plants. Freezing tolerance, estimated as an increase in LT50 (2°C), derived from the electrolyte leakage test, enhanced in ω-9 desaturase overexpressing transgenic potato plants only upon cold acclimation. These results indicate that modifications in lipid unsaturation account for only a small fraction of the acquired freezing tolerance, while interaction with other protective proteins (dhn2, cpn60β) is necessary to fulfil a higher level of freezing tolerance.

Original languageEnglish
Pages (from-to)15-26
Number of pages12
JournalMolecular Breeding
Volume21
Issue number1
DOIs
Publication statusPublished - Jan 2008

Fingerprint

Gene Expression Regulation
Membrane Lipids
Solanum tuberosum
lipid composition
Gene expression
cold tolerance
Freezing
potatoes
gene expression
Acclimatization
Chemical analysis
acclimation
Lipids
Cell membranes
freezing
acyl-(acyl-carrier-protein)desaturase
plasma membrane
Genes
Cell Membrane
lipids

Keywords

  • Fatty acids
  • Freezing tolerance
  • Potato plants
  • Stearoyl-ACP desaturase

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Horticulture
  • Biotechnology
  • Plant Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Regulation of desaturase gene expression, changes in membrane lipid composition and freezing tolerance in potato plants. / De Palma, Monica; Grillo, Stefania; Massarelli, Immacolata; Costa, Antonello; Balogh, G.; Vígh, L.; Leone, Antonella.

In: Molecular Breeding, Vol. 21, No. 1, 01.2008, p. 15-26.

Research output: Contribution to journalArticle

De Palma, Monica ; Grillo, Stefania ; Massarelli, Immacolata ; Costa, Antonello ; Balogh, G. ; Vígh, L. ; Leone, Antonella. / Regulation of desaturase gene expression, changes in membrane lipid composition and freezing tolerance in potato plants. In: Molecular Breeding. 2008 ; Vol. 21, No. 1. pp. 15-26.
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