Publications by authors named "Irene A Vos"
Ethylene (ET) is an important hormone in plant responses to microbial pathogens and herbivorous insects, and in the interaction of plants with beneficial microbes and insects. Early ET signaling events during these biotic interactions involve activities of mitogen-activated protein kinases and ETHYLENE RESPONSE FACTOR transcription factors. Rather than being the principal regulator, ET often modulates defense signaling pathways, including those regulated by jasmonic acid and salicylic acid.
View Article and Find Full Text PDFThe hormone salicylic acid (SA) generally induces plant defenses against biotrophic pathogens. Jasmonic acid (JA) and its oxylipin derivatives together with ethylene (ET) are generally important hormonal regulators of induced plant defenses against necrotrophic pathogens, whereas JAs together with abscisic acid (ABA) are implicated in induced plant defenses against herbivorous insects. Hormonal crosstalk between the different plant defense pathways has often been hypothesized to be a cost-saving strategy that has evolved as a means of the plant to reduce allocation costs by repression of unnecessary defenses, thereby minimizing trade-offs between plant defense and growth.
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- The MYC2 transcription factor and AP2/ERF transcription factors ORA59 and ERF1 regulate different parts of the jasmonic acid (JA) signaling pathway in Arabidopsis, with MYC2 promoting and ERF1 suppressing responses to herbivore feeding.
- Feeding by Pieris rapae larvae activates the MYC branch in damaged leaves, while systemic undamaged leaves show MYC2 gene activation without a corresponding increase in the MYC-branch marker gene VSP1.
- Abscisic acid (ABA) plays a critical role in enhancing the plant's defense response to future herbivore attacks by priming JA-regulated defenses, as evidenced by changes in gene expression and reduced caterpillar growth on pre-inf