13 Ethylene: Multi-Tasker in Plant–Attacker Interactions
Annual Plant Reviews book series, Volume 44: The Plant Hormone Ethylene
Sjoerd Van der Ent,
Corné M.J. Pieterse,
Sjoerd Van der Ent
Plant-Microbe Interactions, Department of Biology, Faculty of Science, Utrecht University, PO Box 800.56, Utrecht, TB, 3508 The Netherlands
Centre for BioSystems Genomics, PO Box 98, Wageningen, AB, 6700 The Netherlands
Search for more papers by this authorCorné M.J. Pieterse
Plant-Microbe Interactions, Department of Biology, Faculty of Science, Utrecht University, PO Box 800.56, Utrecht, TB, 3508 The Netherlands
Centre for BioSystems Genomics, PO Box 98, Wageningen, AB, 6700 The Netherlands
Search for more papers by this authorSjoerd Van der Ent,
Corné M.J. Pieterse,
Sjoerd Van der Ent
Plant-Microbe Interactions, Department of Biology, Faculty of Science, Utrecht University, PO Box 800.56, Utrecht, TB, 3508 The Netherlands
Centre for BioSystems Genomics, PO Box 98, Wageningen, AB, 6700 The Netherlands
Search for more papers by this authorCorné M.J. Pieterse
Plant-Microbe Interactions, Department of Biology, Faculty of Science, Utrecht University, PO Box 800.56, Utrecht, TB, 3508 The Netherlands
Centre for BioSystems Genomics, PO Box 98, Wageningen, AB, 6700 The Netherlands
Search for more papers by this authorThis article was originally published in 2012 in The Plant Hormone Ethylene, Volume 44 (ISBN 9781444330038) of the Annual Plant Reviews book series, this volume edited by Michael T. McManus. The article was republished in Annual Plant Reviews online in April 2018.
Abstract
In the past decades, the role of ethylene in the regulation of plant responses to biotic stress has been intensively studied. Analyses of plant genotypes that are impaired in ethylene biosynthesis, perception or signalling revealed an important role for ethylene in the primary response to pathogen attack. In addition, ethylene has been demonstrated to fulfil a key function in the control of systemic immune responses that are induced by beneficial micro-organisms. Although the importance of ethylene in the regulation of plant immune responses is evident, its role in stimulating disease resistance or susceptibility appears to depend greatly on the plant–attacker combination. Whereas in many studies ethylene was demonstrated to facilitate disease resistance or tolerance, in other studies ethylene was shown to support pathogen infection. Recent advances in defence-signalling research have revealed that ethylene plays an important role in modulating interactions between defence-signalling pathways that are regulated by either salicylic acid (SA) or jasmonic acid (JA). By functioning as a modulator of these important defence-regulatory pathways, ethylene may play a decisive positive or negative role in the final outcome of the immune response of a plant.
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