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SlCOMT1-dependent melatonin biosynthesis is required for auxin-mediated alleviation of cadmium toxicity in tomato

ABSTRACT: Cadmium (Cd) contamination severely inhibits plant growth and development by inducing oxidative damage and disrupting cellular homeostasis. Indole-3-acetic acid (IAA) has been reported to enhance plant tolerance to abiotic stresses; however, the molecular mechanisms underlying IAA-mediated Cd tolerance remain largely unclear. In this study, wild-type tomato plants (Solanum lycopersicum L.) were treated with Cd stress and exogenous IAA, and leaf samples were subjected to transcriptome sequencing to investigate gene expression changes associated with IAA-induced Cd tolerance. The results provide transcriptomic insights into the regulatory mechanisms of IAA in alleviating Cd toxicity in tomato and contribute to understanding the role of hormone-mediated stress adaptation in plants.

ORGANISM(S): Solanum lycopersicum

PROVIDER: GSE332769 | GEO | 2026/05/28

REPOSITORIES: GEO

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Project description:BACKGROUND: The tomato psyllid, Bactericera cockerelli Šulc (Hemiptera: Triozidae), is a pest of solanaceous crops such as tomato (Solanum lycopersicum L.) in the U.S. and vectors the disease-causing pathogen ‘Candidatus Liberibacter solanacearum’. Currently, the only effective strategies for controlling the diseases associated with this pathogen involve regular pesticide applications to manage psyllid population density. However, such practices are unsustainable and will eventually lead to widespread pesticide resistance in psyllids. Therefore, new control strategies must be developed to increase host-plant resistance to insect vectors. For example, expression of constitutive and inducible plant defenses can be improved through selection. Currently, it is still unknown whether psyllid infestation has any lasting consequences on tomato plant defense or tomato plant gene expression in general. RESULTS: To characterize the genes putatively involved in tomato defense against psyllid infestation, RNA was extracted from psyllid-infested and uninfested tomato leaves (Moneymaker) three weeks post-infestation. Transcriptome analysis identified 362 differentially expressed genes. These differentially expressed genes were primarily associated with defense responses to abiotic/biotic stress, transcription/translation, cellular signaling/transport, and photosynthesis. These gene expression changes suggested that tomato plants underwent a reduction in plant growth/health in exchange for improved defense against stress that was observable three weeks after psyllid infestation. Consistent with these observations, tomato plant growth experiments determined that the plants were shorter three weeks after psyllid infestation. Furthermore, psyllid nymphs had lower survival rates on tomato plants that had been previously psyllid infested. CONCLUSION: These results suggested that psyllid infestation has lasting consequences for tomato gene expression, defense, and growth.

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SlCOMT1-dependent melatonin biosynthesis is required for auxin-mediated alleviation of cadmium toxicity in tomato

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