Decoupling of plant growth and accumulation of biologically active compounds in leaves, roots, and root exudates of hypericum perforatum l. By the combination of jasmonate and far‐red lighting

Martina Paponov, Manya Antonyan, Rune Slimestad, Ivan A. Paponov*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

The plant hormone jasmonic acid (JA) fine tunes the growth–defense dilemma by inhibiting plant growth and stimulating the accumulation of secondary compounds. We investigated the interactions between JA and phytochrome B signaling on growth and the accumulation of selected secondary metabolites in Hypericum perforatum L., a medically important plant, by spraying plants with methyl jasmonate (MeJA) and by adding far‐red (FR) lighting. MeJA inhibited plant growth, decreased fructose concentration, and enhanced the accumulation of most secondary metabolites. FR enhanced plant growth and starch accumulation and did not decrease the accumulation of most secondary metabolites. MeJA and FR acted mostly independently with no observable interactions on plant growth or secondary metabolite levels. The accumulation of different compounds (e.g., hypericin, flavonols, flavan‐3‐ols, and phenolic acid) in shoots, roots, and root exudates showed different responses to the two treatments. These findings indicate that the relationship between growth and secondary compound accumulation is specific and depends on the classes of compounds and/or their organ location. The combined application of MeJA and FR enhanced the accumulation of most secondary compounds without compromising plant growth. Thus, the negative correlations between biomass and the content of secondary compounds predicted by the growthdefense dilemma were overcome.

Original languageEnglish
Article number1283
JournalBiomolecules
Volume11
Issue9
DOIs
Publication statusPublished - Sept 2021

Keywords

  • Far‐red light
  • Growth–defense dilemma
  • Hypericin
  • Hypericum perforatum L
  • Jasmonate
  • Plant growth
  • Secondary compounds

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