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Induced tolerance to abiotic and biotic stresses of broccoli and Arabidopsis after treatment with elicitor molecules
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Induced tolerance to abiotic and biotic stresses of broccoli and Arabidopsis after treatment with elicitor molecules
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Journal Article
Induced tolerance to abiotic and biotic stresses of broccoli and Arabidopsis after treatment with elicitor molecules
2020
Overview
The plant hormones salicylic acid (SA) and jasmonic acid (JA) regulate defense mechanisms capable of overcoming different plant stress conditions and constitute distinct but interconnected signaling pathways. Interestingly, several other molecules are reported to trigger stress-specific defense responses to biotic and abiotic stresses. In this study, we investigated the effect of 14 elicitors against diverse but pivotal types of abiotic (drought) and biotic (the chewing insect
Ascia monuste
, the hemibiotrophic bacterium
Pseudomonas syringae
DC 3000 and the necrotrophic fungus
Alternaria alternata
) stresses on broccoli and
Arabidopsis
. Among the main findings, broccoli pre-treated with SA and chitosan showed the highest drought stress recovery in a dose-dependent manner. Several molecules led to increased drought tolerance over a period of three weeks. The enhanced drought tolerance after triggering the SA pathway was associated with stomata control. Moreover, methyl jasmonate (MeJA) reduced
A. monuste
insect development and plant damage, but unexpectedly, other elicitors increased both parameters. GUS reporter assays indicated expression of the SA-dependent
PR1
gene in plants treated with nine elicitors, whereas the JA-dependent
LOX2
gene was only expressed upon MeJA treatment. Overall, elicitors capable of tackling drought and biotrophic pathogens mainly triggered the SA pathway, but adversely also induced systemic susceptibility to chewing insects. These findings provide directions for potential future in-depth characterization and utilization of elicitors and induced resistance in plant protection.
Publisher
Nature Publishing Group UK,Nature Publishing Group
