Biologia Plantarum 63: 122-133, 2019 | DOI: 10.32615/bp.2019.015

Overexpression of a gene AhFBA from Arachis hypogaea confers salinity stress tolerance in Escherichia coli and tobacco

Z.K. Du1,2, Y.F. Hu3, J.M. Li1,2,*
1 Zhejiang Provincial Key Laboratory of Plant Evolution and Conservation, Taizhou University, Taizhou, Zhejiang 318000, P.R. China
2 Institute of Ecology, Taizhou University, Taizhou, Zhejiang 318000, P.R. China
3 College of Agronomy, Sichuan Agricultural University, Chengdu, Sichuan 611130, P.R. China

Fructose-1,6-bisphosphate aldolase (FBA), an essential enzyme involved in the glycolytic pathway, gluconeogenesis, and the Calvin cycle, plays significant roles in the regulation of plant growth, development, and stress responses. In this study, a novel gene, AhFBA (GenBank accession number KF470788), containing a 1077-bp open reading frame and encoding a protein of 358 amino acids, was isolated from Arachis hypogaea L. Bioinformatic analysis revealed that AhFBA belonged to class-I aldolases and preferentially localized in the cytoplasm. Real-time quantitative PCR analysis indicated that AhFBA had a higher expression in young fruits than in leaves and stems, and NaCl could trigger the highest expression of AhFBA in roots and leaves after 3-h and 6-h treatments. The salinity tolerance and survival of Escherichia coli transformed with AhFBA were notably enhanced compared with the control. Transgenic tobacco (Nicotiana tabacum L.) overexpressing the AhFBA gene exhibited a lower hydrogen peroxide content, electrolyte leakage, and malondialdehyde content and a higher photosynthetic efficiency, net photosynthetic rate, relative water content, and sucrose and proline content compared with control plants. Taken together, the results demonstrate that AhFBA functioned as a positive factor enhancing the tolerance of E. coli and N. tabacum to salinity stress, possibly by maintaining the osmotic balance and scavenging hydrogen peroxide.

Keywords: fructose-1,6-bisphosphate aldolase, H2O2, net photosynthetic rate, Nicotiana tabaccum, peanut, proline, RWC

Accepted: November 15, 2018; Prepublished online: November 15, 2018; Published online: January 19, 2019Show citation

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Du, Z.K., Hu, Y.F., & Li, J.M. (2019). Overexpression of a gene AhFBA from Arachis hypogaea confers salinity stress tolerance in Escherichia coli and tobacco. Biologia plantarum63, 122-133. doi: 10.32615/bp.2019.015.
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