Abstract
GATA transcription factors (TFs) are widely distributed in eukaryotes. Some GATA TFs have been shown to be related to photosynthesis, germination, circadian rhythm, and other functions in plants. Our previous study found that some members of this family have obvious responses when tomato plants are subjected to drought stress, in which the SlGATA17 gene is significantly upregulated. To further verify the function of this gene under drought stress, we constructed tomato lines with this gene overexpressed. Phenotypic and physiological indicators indicated that the SlGATA17-overexpressing plants were more drought tolerant than the wild-type plants. Transcriptomic sequencing results showed that the overexpression of the SlGATA17 gene improved the activity of the phenylpropanoid biosynthesis pathway. The PAL enzyme activity assay results confirmed that the initial activity of this pathway was enhanced in transgenic plants, especially in the initial response stage, indicating that the SlGATA17 gene regulates the drought resistance of tomato plants by regulating the activity of the phenylpropanoid biosynthesis pathway.
Highlights
Tomato (Solanum lycopersicum L.) is one of the most widely cultivated and economically important crop plants worldwide
Phylogenetic relationships were analyzed for all the GATA family genes in tomatoes, and the GATA family genes of tomatoes were divided into four groups
These results indicated that WT plants are more damaged by drought stress and that OE plants have a stronger ability to resist drought stress
Summary
Tomato (Solanum lycopersicum L.) is one of the most widely cultivated and economically important crop plants worldwide. Tomato is a model system in plant research. Because tomatoes are sensitive to drought stress, they need sufficient water to grow. Drought will lead to a decrease in tomato yield, an increase in disease, and a decrease in fruit quality. Improvement in the drought resistance of tomato varieties is important. Transcription factors (TFs) are proteins that bind to DNA-regulatory sequences to modulate the rate of gene transcription, which plays an important role in plant growth and stress regulation.
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