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- Title
INTERACTIONS BETWEEN ABSCISIC-ACID-MEDIATED RESPONSES AND PLANT RESISTANCE TO PATHOGENS AND INSECTS.
- Authors
Thaler, Jennifer S.; Bostock, Richard M.
- Abstract
One goal of phytohormonal ecology is to study the interactions between biotic and abiotic stress at hierarchical levels of biological organization. From an ecological perspective, exposure to one stress may alter the plant's probability of being exposed to another stress. From a mechanistic perspective, hormonal and biochemical signaling interactions between responses to each stress may influence the severity or ability to adaptively respond to the subsequent stress. In this article, we consider the relationship between plant water and salt stress and attack by pathogens and herbivores. Empirical data suggest that water stress and the probability of attack by pathogens and herbivores are correlated between habitats. Biochemical interactions between plant responses to water and salt stress and insect and pathogen attack are also interrelated. Initial biochemical models indicated that abscisic acid (ABA), an important hormone in responses to water and salt stress, had a synergistic positive role with jasmonate-induced defenses against herbivores and an antagonistic role with salicylate-based resistance to some pathogens. Based on this back-ground, we developed predictions about how water and salt stress would alter plant resistance to insects and pathogens and tested the predictions using tomato plants as a model system. We used polyphenol oxidase activity as a marker of the jasmonate response and pathogenesis-related protein P4 as a marker of the salicylate response. First, we examined levels of chemical defense in wild-type and ABA-deficient plants and the ability of these plants to resist insect and pathogen attack. In the second experiment, we exposed plants to short-term salinity stress and tested their subsequent resistance to a chewing insect Spodoptera exigua and the bacterial speck pathogen Pseudomonas syringae pv. tomato.
- Subjects
PLANT hormones; ABSCISIC acid; PLANT adaptation; PLANT-water relationships; SALINITY; PATHOGENIC microorganisms; INSECTS
- Publication
Ecology, 2004, Vol 85, Issue 1, p48
- ISSN
0012-9658
- Publication type
Article
- DOI
10.1890/02-0710