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Genes 2017, 8(12), 402; https://doi.org/10.3390/genes8120402

SlbZIP38, a Tomato bZIP Family Gene Downregulated by Abscisic Acid, Is a Negative Regulator of Drought and Salt Stress Tolerance

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Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Southwest University, Chongqing 400715, China
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College of Horticulture and Landscape Architecture, Southwest University, Chongqing 400715, China
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Authors to whom correspondence should be addressed.
Received: 6 November 2017 / Revised: 7 December 2017 / Accepted: 13 December 2017 / Published: 20 December 2017
(This article belongs to the Special Issue Genetic Regulation of Abiotic Stress Responses)
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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. View Full-Text
Keywords: Solanum lycopersicum; ABA; bZIP transcription factor; drought stress; salt stress; SlbZIP38 Solanum lycopersicum; ABA; bZIP transcription factor; drought stress; salt stress; SlbZIP38
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Pan, Y.; Hu, X.; Li, C.; Xu, X.; Su, C.; Li, J.; Song, H.; Zhang, X.; Pan, Y. SlbZIP38, a Tomato bZIP Family Gene Downregulated by Abscisic Acid, Is a Negative Regulator of Drought and Salt Stress Tolerance. Genes 2017, 8, 402.

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