biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 65:27-38, 2021 | DOI: 10.32615/bp.2020.164

Overexpression of the Panax ginseng MYB4 gene enhances stress tolerance in transgenic Arabidopsis thaliana

W.H. LIAN1, T.X. SUN1, X.Y. MENG2, R. SUN1, F. HUI1, Y.N. JIANG1, *, Y. ZHAO1, *
1 Jilin Ginseng Academy, Changchun University of Chinese Medicine, Changchun 130117, P.R. China
2 Jilin Yatai Bio-pharmaceuticals Co. Ltd, Changchun 130000, P.R. China

The myeloblastosis (MYB) transcription factors are essential for plant stress responses. They can enhance plant tolerance to abiotic stresses (e.g., drought, salinity, and cold) via improved physiological and biochemical responses including the accumulation of metabolites. In this study, we constructed a Panax ginseng MYB4 (PgMYB4) gene expression vector and established the stable transgenic Arabidopsis thaliana lines to study the effects of this gene on plant stress tolerance. The germination rate and seedling taproot length were greater for the PgMYB4-overexpressing plants than for the wild-type plants. Accordingly, the overexpression of PgMYB4 in Arabidopsis enhanced seedling tolerance to drought, salt, and cold conditions. Under drought stress, the relative chlorophyll content decreased less, the proline content increased more, and the water loss rate decreased more in the transgenic plants than in the wild type. The expressions of stress-related genes responsive to dehydration 19A, responsive to dehydration 22, responsive to desiccation 29A, cold-regulated 15A, cold-regulated 47, and pyrroline-5-carboxylate synthase 1 were significantly upregulated in the transgenic Arabidopsis plants. Under high salt stress, the kinesin 1 (KIN1) expression was significantly upregulated in the transgenic plants. In response to the low temperature stress, the dehydration-responsive element binding protein 2A and KIN1 expressions increased dramatically in the transgenic Arabidopsis plants. Thus, PgMYB4 positively regulated the stress tolerance gene networks, which promoted the expression of anti-stress effector genes. This gene may be useful for ginseng breeding programs aiming to develop new cultivars with enhanced stress tolerance.

Keywords: cold stress, drought, gene expression, salinity.

Received: May 6, 2020; Revised: November 8, 2020; Accepted: November 11, 2020; Published online: March 17, 2021  Show citation

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LIAN, W.H., SUN, T.X., MENG, X.Y., SUN, R., HUI, F., JIANG, Y.N., & ZHAO, Y. (2021). Overexpression of the Panax ginseng MYB4 gene enhances stress tolerance in transgenic Arabidopsis thaliana. Biologia plantarum, 65, Article 27-38. https://doi.org/10.32615/bp.2020.164
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