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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

SbMYB15 transcription factor mitigates cadmium and nickel stress in transgenic tobacco by limiting uptake and modulating antioxidative defence system

Komal K. Sapara A B , Jackson Khedia A B , Parinita Agarwal , Doddabhimappa R. Gangapur A and Pradeep K. Agarwal https://orcid.org/0000-0002-2588-9622 A C
+ Author Affiliations
- Author Affiliations

A Division of Biotechnology and Phycology, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar - 364 002, (Gujarat), India.

B Academy of Scientific and Innovative Research, CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), Gijubhai Badheka Marg, Bhavnagar - 364 002, (Gujarat), India.

C Corresponding author. Email: pagarwal@csmcri.res.in

Functional Plant Biology 46(8) 702-714 https://doi.org/10.1071/FP18234
Submitted: 19 July 2018  Accepted: 12 March 2019   Published: 26 April 2019

Abstract

Plants require different inorganic minerals in an appropriate amount for growth; however, imbalance can limit growth and productivity. Heavy metal accumulation causes toxicity and generates signalling crosstalk with reactive oxygen species (ROS), phytohormones, genes and transcription factors (TFs). The MYB (myeloblastoma) TFs participate in plant processes such as metabolism, development, cell fate, hormone pathways and responses to stresses. This is the first report towards characterisation of R2R3-type MYB TF, SbMYB15, from succulent halophyte Salicornia brachiata Roxb. for heavy metal tolerance. The SbMYB15 showed >5-fold increased transcript expression in the presence of CdCl2 and NiCl2•6H2O. The constitutive overexpression of SbMYB15 conferred cadmium and nickel tolerance in transgenic tobacco, with improved growth and chlorophyll content. Further, the transgenics showed reduced generation of reactive oxygen species (H2O2 and O2•−) as compared with the wild-type (WT) with both Cd2+ and Ni2+ stress. Transgenics also showed low uptake of heavy metal ions, increased scavenging activity of the antioxidative enzymes (CAT and SOD) and higher transcript expression of antioxidative genes (CAT1 and MnSOD). Thus, the present study signifies that SbMYB15 can be deployed for developing heavy metal tolerance in crop plants via genetic engineering.

Additional keywords: antioxidative enzymes, Cd, MYB, Ni, overexpression, reactive oxygen species, transgenics.


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