RNAi-mediated pinoresinol lariciresinol reductase gene silencing in flax (Linum usitatissimum L.) seed coat: consequences on lignans and neolignans accumulation

J Plant Physiol. 2014 Sep 15;171(15):1372-7. doi: 10.1016/j.jplph.2014.06.005. Epub 2014 Jun 23.

Abstract

RNAi technology was applied to down regulate LuPLR1 gene expression in flax (Linum usitatissimum L.) seeds. This gene encodes a pinoresinol lariciresinol reductase responsible for the synthesis of (+)-secoisolariciresinol diglucoside (SDG), the major lignan accumulated in the seed coat. If flax lignans biological properties and health benefits are well documented their roles in planta remain unclear. This loss of function strategy was developed to better understand the implication of the PLR1 enzyme in the lignan biosynthetic pathway and to provide new insights on the functions of these compounds. RNAi plants generated exhibited LuPLR1 gene silencing as demonstrated by quantitative RT-PCR experiments and the failed to accumulate SDG. The accumulation of pinoresinol the substrate of the PLR1 enzyme under its diglucosylated form (PDG) was increased in transgenic seeds but did not compensate the overall loss of SDG. The monolignol flux was also deviated through the synthesis of 8-5' linked neolignans dehydrodiconiferyl alcohol glucoside (DCG) and dihydro-dehydrodiconiferyl alcohol glucoside (DDCG) which were observed for the first time in flax seeds.

Keywords: Flax; Lignans; RNA interference; Secoisolariciresinol.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Butylene Glycols / chemistry
  • Butylene Glycols / metabolism
  • Flax / chemistry
  • Flax / enzymology*
  • Flax / genetics
  • Furans / chemistry
  • Furans / metabolism
  • Gene Expression Regulation, Enzymologic
  • Gene Expression Regulation, Plant*
  • Gene Knockdown Techniques
  • Glucosides / chemistry
  • Glucosides / metabolism
  • Lignans / biosynthesis
  • Lignans / chemistry
  • Lignans / metabolism
  • Oxidoreductases / genetics*
  • Oxidoreductases / metabolism
  • Plant Proteins / genetics
  • Plant Proteins / metabolism
  • Plants, Genetically Modified
  • RNA Interference
  • Seeds / chemistry
  • Seeds / enzymology
  • Seeds / genetics

Substances

  • Butylene Glycols
  • Furans
  • Glucosides
  • Lignans
  • Plant Proteins
  • dehydrodiconiferyl glucoside
  • lariciresinol
  • Oxidoreductases
  • lariciresinol reductase
  • pinoresinol reductase
  • secoisolariciresinol
  • pinoresinol