Enhanced glucosinolates in root exudates of Brassica rapa ssp. rapa mediated by salicylic acid and methyl jasmonate

J Agric Food Chem. 2011 Feb 23;59(4):1400-5. doi: 10.1021/jf103585s. Epub 2011 Jan 25.

Abstract

Elicitation studies with salicylic acid (SA) and methyl jasmonate (MJ) inducing a targeted rhizosecretion of high levels of anticarcinogenic glucosinolates in Brassica rapa ssp. rapa plants were conducted. Elicitor applications not only led to an accumulation of individual indole glucosinolates and the aromatic 2-phenylethyl glucosinolate in the turnip organs but also in turnip root exudates. This indicates an extended systemic response, which comprises the phyllosphere with all aboveground plant organs and the rhizosphere including the belowground root system and also root exudates. Both elicitor applications induced a doubling in 2-phenylethyl glucosinolate in root exudates, whereas application of MJ enhanced rhizosecreted indole glucosinolates up to 4-fold. In addition, the time course study revealed that maximal elicitation was observed on the 10th day of SA and MJ treatment. This study may provide an essential contribution using these glucosinolates as bioactive additives in functional foods and nutraceuticals.

MeSH terms

  • Acetates / pharmacology*
  • Anticarcinogenic Agents
  • Brassica rapa / metabolism*
  • Cyclopentanes / pharmacology*
  • Glucosinolates / analysis
  • Glucosinolates / metabolism*
  • Kinetics
  • Oxylipins / pharmacology*
  • Plant Growth Regulators
  • Plant Roots / drug effects*
  • Plant Roots / metabolism*
  • Salicylic Acid / pharmacology*

Substances

  • Acetates
  • Anticarcinogenic Agents
  • Cyclopentanes
  • Glucosinolates
  • Oxylipins
  • Plant Growth Regulators
  • methyl jasmonate
  • Salicylic Acid