Coronalon: a powerful tool in plant stress physiology

Abstract

Coronalon, a synthetic 6-ethyl indanoyl isoleucine conjugate, has been designed as a highly active mimic of octadecanoid phytohormones that are involved in insect and disease resistance. The spectrum of biological activities that is a¡ected by coronalon was investigated in nine di¡erent plant systems speci¢cally responding to jasmonates and/or 12-oxo-phytodienoic acid. In all bioassays analyzed, coronalon demonstrated a general strong activity at low micromolar concentrations. The results obtained showed the induction of (i) defense-related secondary metabolite accumulation in both cell cultures and plant tissues, (ii) speci¢c abiotic and biotic stress-related gene expression, and (iii) root growth retardation. The general activity of coronalon in the induction of plant stress responses together with its simple and e⁄cient synthesis suggests that this compound might serve as a valuable tool in the examination of various aspects in plant stress physiology. Moreover, coronalon might become employed in agriculture to elicit plant resistance against various aggressors.

Variation of Herbivore-Induced Volatile Terpenes among Arabidopsis Ecotypes Depends on Allelic Differences and Subcellular Targeting of Two Terpene Synthases, TPS02 and TPS03

“…For treatment of various accessions with coronalon, hydroponically grown plants were placed with their roots in glass beakers containing 30 mL of hydroponic medium with 33 mg mL 21 (100 mM) coronalon, 0.1% ethanol (Schuler et al, 2004). Treatment was performed for 30 h. For treatments of detached Arabidopsis leaves with coronalon or alamethicin, 16 leaves were cut off from soil-grown plants and transferred with their petioles into glass beakers filled with 10-mL aqueous solutions of 16.5 mg mL 21 (50 mM) coronalon, 0.1% ethanol or 10 mg mL 21 alamethicin, 0.1% ethanol.…”

Potential for the Use of Exogenous Chemical Elicitors in Disease and Insect Pest Management of Conifer Seedling Production

“…Methyl jasmonate (MeJA), (Z,E)-methyl 3-oxo-2-(2-pentyl) cyclopentane acetate is a plant hormone formed via the octadecanoid pathway together with jasmonic acid (JA) [18]. JA and MeJA are formed in plants under various biotic stresses.…”

“…MeJA is a catabolite of JA and both activate genes controlling the secondary metabolic pathways. Synthetic octa-decanoid phytohormone mimic compounds like coronalon (6-ethyl indanoyl isoleucine conjugate) are highly active elicitor compounds inducing similar responses in several plant species [18].…”

Effects of Coronatine on Growth, Gas Exchange Traits, Chlorophyll Content, Antioxidant Enzymes and Lipid Peroxidation in Maize (Zea mays L.) Seedlings under Simulated Drought Stress

“…Investigations have revealed that coronatine showed different physiological effects on different tissues (Kenyon and Turner, 1990), and it is plausible that it acts differently in monocotyledon and dicotyledon plants (Uppalàpati et al, 2005). Many reports have shown that coronatine mediates the stress response associated with pathogens and herbivory (Lauchli and Boland, 2003;Schüler et al, 2004), and it was suggested to mediate plant responses to environment stresses. Our previous study showed that coronatine alleviated salinity stress in cotton by improving the antioxidative defense system and DPPH-radical scavenging activity (Xie et al, 2008), but its effects on drought and osmotic stress is still unknown.…”