Abstract
The basic leucine zipper (bZIP) transcription factors have crucial roles in plant stress responses. In this study, the bZIP family gene SlbZIP38 (GenBank accession No: XM004239373) was isolated from a tomato (Solanum lycopersicum cv. Ailsa Craig) mature leaf cDNA library. The DNA sequence of SlbZIP38 encodes a protein of 484 amino acids, including a highly conserved bZIP DNA-binding domain in the C-terminal region. We found that SlbZIP38 was differentially expressed in various organs of the tomato plant and was downregulated by drought, salt stress, and abscisic acid (ABA). However, overexpression of SlbZIP38 significantly decreased drought and salt stress tolerance in tomatoes (Ailsa Craig). The findings that SlbZIP38 overexpression reduced the chlorophyll and free proline content in leaves but increased the malondialdehyde content may explain the reduced drought and salt tolerance observed in these lines. These results suggest that SlbZIP38 is a negative regulator of drought and salt resistance that acts by modulating ABA signaling.
Highlights
Plant growth and crop productivity are limited by various adverse environmental stresses, including drought, high-salinity, and low temperature, which were significantly reduced the crop productivity [1]
The 1455-bp full-length cDNA sequence of the SlbZIP38, a basic leucine zipper transcription factor was obtained from a cDNA library prepared from mature tomatoes
SlbZIP38 expression showed different expression tendencies after treatment with gibberellic acid (GA), jasmonic acid (JA), and Eth (Figure 2C,D,F), resulting in higher expression compared to the control at some time points, but lower expression at others. These results indicate that SlbZIP38 expression is negatively regulated by salicylic acid (SA) and abscisic acid (ABA), and is induced by light
Summary
Plant growth and crop productivity are limited by various adverse environmental stresses, including drought, high-salinity, and low temperature, which were significantly reduced the crop productivity [1]. Salt, and cold stress, ABA triggers the induction of dehydration resistance genes [8], including the late embryogenesis abundant (LEA) genes and those encoding transcription factors, water transporters such as aquaporin, catalase, protein kinases, and phosphatases [9]. The expression of these genes protects cells and enables the plant to adapt to the stressful environment [10,11]. 75 bZIP genes have been identified in Arabidopsis thaliana [12], 89 in Oryza sativa (rice) [13], 125 in Zea mays (maize) [14], and 131 in Glycine max (soybean) [15]
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