The expansin gene NtEXPA5 increases stress tolerance of tobacco hairy roots through an effect on the antioxidant system

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Background: Expansins are non-enzymatic proteins involved in the softening of cell walls, the mechanism of action of which is associated with the weakening and breaking of hydrogen bonds between xyloglucans and cellulose microfibrils and is aimed at ensuring cell expansion.

The aim of our work was to obtain hairy roots of tobacco with constitutive expression of the NtEXPA5 expansin gene, their morphometric analysis and assessment of the state of their antioxidant system in response to stress factors.

Materials and methods: The hairy roots were obtained from transgenic tobacco plants expressing the NtEXPA5 gene under the control of the 35S promoter.

Results: Constitutive expression of the NtEXPA5 gene promoted an increase in the length and dry weight of hairy roots both under normal conditions and under the action of salinity, copper sulfate, cadmium acetate, and mannitol. Both under normal conditions and under the action of stress factors in transgenic hairy roots, an increase in the activity of superoxide dismutase and the total antioxidate activity was recorded.

Conclusion: Expansins exert their positive effect on the productivity and stress tolerance of plants not only through their influence on cell expansion, but also through the effect on the antioxidant system.

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About the authors

Bulat R. Kuluev

Institute of Biochemistry and Genetics – Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences; Bashkir State University

Author for correspondence.
ORCID iD: 0000-0002-1564-164X
SPIN-code: 8580-5347
Scopus Author ID: 23094029400
ResearcherId: N-3927-2016

Russian Federation, 71 October Av., 450054 Ufa; Ufa

Dr. Sci. (Biol.)

Khalit G. Musin

Institute of Biochemistry and Genetics – Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences

ORCID iD: 0000-0001-7336-2027
SPIN-code: 8966-4290
ResearcherId: P-2298-2017

Russian Federation, 71 October Av., 450054 Ufa

Junior Researcher, Laboratory of Plant Genomics

Alfira B. Yakupova

Institute of Biochemistry and Genetics – Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences; Bashkir State University

SPIN-code: 1480-4353
Scopus Author ID: 36344236800

Russian Federation, 71 October Av., 450054 Ufa; Ufa

Cand. Sci. (Biol.)


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Supplementary files

Supplementary Files Action
Fig. 1. Morphometric analysis of hairy roots with constitutive expression of the NtEXPA5 gene: a - root growth in length for 30 days of cultivation; b - dry weight of roots after 30 days of cultivation. WT - wild type (control), E1 – E-6 - HRs lines. Asterisks indicate significant differences from control according to Duncan's test (p <0.05)

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Fig. 2. Analysis of the antioxidant system of hairy root cultures with constitutive expression of the NtEXPA5 gene: a - activity of superoxide dismutase; b - catalase activity; c - peroxidase activity; d is the total antioxidant activity. Asterisks indicate significant differences from control according to Duncan's test (p <0.05)

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Copyright (c) 2021 Kuluev B.R., Musin K.G., Yakupova A.B.

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