Jasmonic acid and salicylic acid represent important signaling compounds in plant defensive responses against other organisms. Here, we present a new method for the easy, sensitive, and reproducible quantification of both compounds by vapor-phase extraction and gas chromatography-positive ion chemical ionization-mass spectrometry. The method is based on a one-step extraction, phase partitioning...

At least two different signalling pathways have been identified that result in clearly distinguishable volatile profiles in response to pathogens and herbivores in the lima bean Phaseolus lunatus. Alamethicin, a voltage-gated ion-channel-forming peptide from Trichoderma viride, is a potent inducer of volatile biosynthesis in the lima bean. Unlike elicitation with cellulysin or herbivore damage,...

Most WRKY transcription factors activate expression of defence genes in a salicylic acid- and/or jasmonic acid-dependent signalling pathway. We previously identified a WRKY gene, VvWRKY1, which is able to enhance tolerance to fungal pathogens when it is overexpressed in tobacco. The present work analyzes the effects of VvWRKY1 overexpression in grapevine. Microarray analysis showed that genes e...

The plant hormone jasmonic acid (JA) and its derivative, an amino conjugate of JA (jasmonoyl isoleucine: JA-Ile), are signaling compounds involved in the regulation cellular defense development plants [...]

Jasmonic acid is a natural plant hormone that induces native defense responses in plants. Sugarbeet (Beta vulgaris L.) root unigenes that were differentially expressed 2 and 60 days after a postharvest jasmonic acid treatment are presented. Data include changes in unigene expression relative to water-treated controls, unigene annotations against nonredundant (Nr), Swiss-Prot, Clusters of Orthol...

A dipeptide conjugate of jasmonic acid, [N-( )-jasmonoyl]-Lalanyl -L-leucine, was prepared and its biological activities were investigated. The conjugate was active in the emission of linalool from rice leaves, while [N-( )-jasmonoyl]-D-alanyl-L-leucine was not. Neither conjugate was active in the production of sakuranetin. This is the first report of a biologically active dipeptide conjugate o...