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Zinc finger-homeodomains (ZF-HDs) are considered transcription factors that are involved in a variety of life activities in plants, but their function in regulating plant salt stress tolerance is unclear. The  SL-ZH13  gene is significantly upregulated under salt stress treatment in tomato ( Solanum lycopersicum ) leaves, per our previous study. In this study, to further understand the role that the  SL-ZH13  gene played in the response process of tomato plants under salt stress, the virus-induced gene silencing (VIGS) method was applied to down-regulate  SL-ZH13  expression in tomato plants, and these plants were treated with salt stress to analyze the changes in salt tolerance. The silencing efficiency of  SL-ZH13  was confirmed by quantitative real-time PCR analysis.  SL-ZH13 -silenced plants wilted faster and sooner than control plants under the same salt stress treatment condition, and the main stem bending angle of  SL-ZH13 -silenced plants was smaller than that of control plants. Physiological analysis showed that the activities of superoxide dismutase, peroxidase, and proline content in  SL-ZH13 -silenced plants were lower than those in control plants at 1.5 and 3 hours after salt stress treatment. The malondialdehyde content of  SL-ZH13 -silenced plants was higher than that in control plants at 1.5 and 3 hours after salt stress treatment; H 2 O 2  and O 2  -  accumulated much more in leaves of  SL-ZH13 -silenced plants than in leaves of control plants. These results suggested that silencing of the  SL-ZH13  gene affected the response of tomato plants to salt stress and decreased the salt stress tolerance of tomato plants.

Silencing of the SL-ZH13 Transcription Factor Gene Decreases the Salt Stress Tolerance of Tomato