Biologia plantarum 62:511-520, 2018 | DOI: 10.1007/s10535-018-0800-9

Expression of rice OsMyb4 transcription factor improves tolerance to copper or zinc in canola plants

G. N. Raldugina1,*, M. Maree1, M. Mattana2, G. Shumkova1, S. Mapelli2, V. P. Kholodova1, I. V. Karpichev1, V. V. Kuznetsov1
1 Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
2 Institute of Agricultural Biology and Biotechnology, National Research Council, Milan, Italy

The effects of copper and zinc salts on transgenic canola plants expressing rice transcription factor (TF) OsMYB4 were investigated. Transgenic plants (TPs), which showed a high OsMyb4 expression in response to either Cu or to Zn excess, were used for the current study. In leaves of TPs, the content of Cu was equal and the content of Zn was significantly higher than in non-transformed plants (NTPs). The TPs grown on an extremely high concentration of heavy metals (HMs; 150 μМ CuSO4 or 5 000 μМ ZnSO4) were able to survive for more than 15 d, while NTPs died after 7 - 9 d of incubation. This indicates that expression of OsMyb4 in canola plants improved their HM tolerance. The TPs tolerance to HMs was confirmed by a higher shoot biomass than that in NTPs. Excess of HMs caused oxidative stress (indicated by increase in malondialdehyde content) especially in leaves of NTPs. This data suggests a protective role of the OsMyb4 TF in oxidative stress. The HMs caused a lower decrease in activities of superoxide dismutase and guaiacol peroxidase in TPs than in NTPs. Higher tolerance of TPs to HMs was also suggested by a considerable increase in the content of low-molecular phenolic compounds, including flavonoids and anthocyanins, as well as proline (a potential antioxidant and chaperone). These data suggest that OsMYB4 may play a role as a positive regulator of phenylpropanoid pathway and proline synthesis. The created canola OsMyb4 TPs may be useful for future applications in phytoremediation of HM-polluted soils.

Keywords: anthocyanins; Brassica napus; guaiacol peroxidase; heavy metals; malondialdehyde; proline; superoxide dismutase
Subjects: transcription factor; transgenic plants; copper; zinc; anthocyanins; peroxidase; proline; superoxide dismutase; canola; rice
Species: Oryza sativa; Brassica napus

Received: May 24, 2017; Revised: February 5, 2018; Accepted: February 12, 2018; Published: September 1, 2018Show citation

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Raldugina, G.N., Maree, M., Mattana, M., Shumkova, G., Mapelli, S., Kholodova, V.P., Karpichev, I.V., & Kuznetsov, V.V. (2018). Expression of rice OsMyb4 transcription factor improves tolerance to copper or zinc in canola plants. Biologia plantarum, 62(3), 511-520. doi: 10.1007/s10535-018-0800-9.
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