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Vos IA, Moritz L, Pieterse CM, et al. Impact of hormonal crosstalk on plant resistance and fitness under multi-attacker conditions. Front Plant Sci. 2015;6:639doi: 10.3389/fpls.2015.00639.
Vos, I. A., Moritz, L., Pieterse, C. M., & Van Wees, S. C. (2015). Impact of hormonal crosstalk on plant resistance and fitness under multi-attacker conditions. Frontiers in plant science, 6639. https://doi.org/10.3389/fpls.2015.00639
Vos, Irene A, et al. "Impact of hormonal crosstalk on plant resistance and fitness under multi-attacker conditions." Frontiers in plant science vol. 6 (2015): 639. doi: https://doi.org/10.3389/fpls.2015.00639
Vos IA, Moritz L, Pieterse CM, Van Wees SC. Impact of hormonal crosstalk on plant resistance and fitness under multi-attacker conditions. Front Plant Sci. 2015 Aug 17;6:639. doi: 10.3389/fpls.2015.00639. eCollection 2015. PMID: 26347758; PMCID: PMC4538242.
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Front Plant Sci. 2015 Aug 17;6:639. doi: 10.3389/fpls.2015.00639. eCollection 2015.

Impact of hormonal crosstalk on plant resistance and fitness under multi-attacker conditions.

Frontiers in plant science

Irene A Vos, Liselotte Moritz, Corné M J Pieterse, Saskia C M Van Wees

Affiliations

  1. Plant-Microbe Interactions, Department of Biology, Faculty of Science, Utrecht University Utrecht, Netherlands.

PMID: 26347758 PMCID: PMC4538242 DOI: 10.3389/fpls.2015.00639

Abstract

The 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. However, proof for this hypothesis has not been demonstrated yet. In this study the impact of hormonal crosstalk on disease resistance and fitness of Arabidopsis thaliana when under multi-species attack was investigated. Induction of SA- or JA/ABA-dependent defense responses by the biotrophic pathogen Hyaloperonospora arabidopsidis or the herbivorous insect Pieris rapae, respectively, was shown to reduce the level of induced JA/ET-dependent defense against subsequent infection with the necrotrophic pathogen Botrytis cinerea. However, despite the enhanced susceptibility to this second attacker, no additional long-term negative effects were observed on plant fitness when plants had been challenged by multiple attackers. Similarly, when plants were grown in dense competition stands to enlarge fitness effects of induced defenses, treatment with a combination of SA and MeJA did not cause additional negative effects on plant fitness in comparison to the single MeJA treatment. Together, these data support the notion that hormonal crosstalk in plants during multi-attacker interactions allows plants to prioritize their defenses, while limiting the fitness costs associated with induction of defenses.

Keywords: Botrytis cinerea; Hyaloperonospora arabidopsidis; Pieris rapae; fitness; hormonal crosstalk; resistance

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