The phytotoxic principle, coronatine, which is present in several pathovars of the plant pathogen, Pseudomonas syringae was shown to be highly active in completely different, jasmonate-selective bioassays. At nanomolar to micromolar concentrations, coronatine induced the accumulation of defense-related secondary metabolites in several plant cell cultures, induced transcript accumulation of the ...

Environmental stress affects plant growth and development. Several plant hormones, such as salicylic acid, abscisic acid, jasmonic acid and ethylene play a crucial role in altering plant morphology in response to stress. Developmental regulation often has the cell cycle machinery among its targets. We analyzed the effect of jasmonic acid (JA) and abscisic acid (ABA) on cell cycle progression in...

Treatment of parsley cell cultures with a fungal elicitor triggered the induction of a lipoxygenase isoform which may be involved in the de novo synthesis of defence-response inducers, such as jasmonic acid or 12-oxo-phytodienoic acid.

Roots are the primary organs that first sense the soil environment. Plant growth and development are largely dependent on the plant root system, due to its crucial role in water and mineral uptake. Symbiotic microorganisms affect and improve the root response to stresses. Root endophytes and bacteria synthesize a wide array of plant-protecting chemicals, hormones, and compounds acting on hormon...

Jasmonic acid and its derivatives can modulate aspects of fruit ripening, production of viable pollen, root growth, tendril coiling, and plant resistance to insects and pathogens. Jasmonate activates genes involved in pathogen and insect resistance, and genes encoding vegetative storage proteins, but represses genes encoding proteins involved in photosynthesis. Jasmonic acid is derived from lin...

Jasmonic acid [(l^?5',27?5')-3-oxo-2-(2Z-pentenyl)cyclopentane-1-acetic acid] (4)* (Fig. 1) and its methyl ester are not only important substances in perfumery but the (-)-enantiomer of 4 and (-)-methyl jasmonate are also known to be endogenous plant growth regulators, widely distributed within the plant kingdom, and possessing phytohormone like properties [2, 3], Both substances have received ...

Colonisation of plant roots by selected beneficial Trichoderma fungi or Pseudomonas bacteria can result in the activation of a systemic defence response that is effective against a broad spectrum of pathogens. In Arabidopsis thaliana, induced systemic resistance (ISR) triggered by the rhizobacterial strain Pseudomonas fluorescens WCS417r is regulated by a jasmonic acid- and ethylene-dependent d...

Pak choi plants (Brassica rapa ssp. chinensis) were treated with different signaling molecules methyl jasmonate, jasmonic acid, linolenic acid, and methyl salicylate and were analyzed for specific changes in their glucosinolate profile. Glucosinolate levels were quantified using HPLC-DAD-UV, with focus on induction of indole glucosinolates and special emphasis on 1-methoxy-indol-3-ylmethyl gluc...