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Title: Differential roles of melatonin in plant‐host resistance and pathogen suppression in cucurbits

Journal Article · · Journal of Pineal Research
DOI:https://doi.org/10.1111/jpi.12505· OSTI ID:1440803
 [1];  [2];  [3];  [4];  [5]
  1. USDA ARS, U.S. Vegetable Laboratory Charleston SC USA, ORISE Participant sponsored by the U.S. Vegetable Laboratory USDA, ARS Charleston SC USA
  2. Department of Forest Resources and Environmental Conservation Virginia Tech Blacksburg VA USA
  3. Clemson University, CREC Charleston SC USA
  4. Department of Chemistry Claflin University Orangeburg SC USA
  5. USDA ARS, U.S. Vegetable Laboratory Charleston SC USA

Abstract Since the 1950s, research on the animal neurohormone, melatonin, has focused on its multiregulatory effect on patients suffering from insomnia, cancer, and Alzheimer’s disease. In plants, melatonin plays major role in plant growth and development, and is inducible in response to diverse biotic and abiotic stresses. However, studies on the direct role of melatonin in disease suppression and as a signaling molecule in host‐pathogen defense mechanism are lacking. This study provides insight on the predicted biosynthetic pathway of melatonin in watermelon ( Citrullus lanatus ), and how application of melatonin, an environmental‐friendly immune inducer, can boost plant immunity and suppress pathogen growth where fungicide resistance and lack of genetic resistance are major problems. We evaluated the effect of spray‐applied melatonin and also transformed watermelon plants with the melatonin biosynthetic gene SNAT (serotonin N‐acetyltransferase) to determine the role of melatonin in plant defense. Increased melatonin levels in plants were found to boost resistance against the foliar pathogen Podosphaera xanthii (powdery mildew), and the soil‐borne oomycete Phytophthora capsici in watermelon and other cucurbits. Further, transcriptomic data on melatonin‐sprayed (1 mmol/L) watermelon leaves suggest that melatonin alters the expression of genes involved in both PAMP ‐mediated (pathogen‐associated molecular pattern) and ETI ‐mediated (effector‐triggered immunity) defenses. Twenty‐seven upregulated genes were associated with constitutive defense as well as initial priming of the melatonin‐induced plant resistance response. Our results indicate that developing strategies to increase melatonin levels in specialty crops such as watermelon can lead to resistance against diverse filamentous pathogens.

Sponsoring Organization:
USDOE
OSTI ID:
1440803
Journal Information:
Journal of Pineal Research, Journal Name: Journal of Pineal Research Vol. 65 Journal Issue: 3; ISSN 0742-3098
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

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