Feng Y, Cui R, Huang Y, Shi L, Wang S, Xu F. Repression of transcription factor At
WRKY47 confers tolerance to boron toxicity in Arabidopsis thaliana.
Ecotoxicol Environ Saf 2021;
220:112406. [PMID:
34119927 DOI:
10.1016/j.ecoenv.2021.112406]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 06/01/2021] [Accepted: 06/03/2021] [Indexed: 06/12/2023]
Abstract
Boron (B) excess gives rise to a serious agricultural problem. In this study, we identified a B toxicity responsive transcription factor AtWRKY47 in Arabidopsis thaliana. The T-DNA insertion mutants Atwrky47 showed enhanced tolerance to B toxicity with better growth parameters under high B conditions compared to wild-type Col-0 plants. Quantitative analysis of AtWRKY47 mRNA abundance indicated that it was down-regulated under B toxicity conditions. Fluorescently labeled AtWRKY47 protein was localized in nucleus. In contrast to the phenotype of Atwrky47 mutants, overexpression of AtWRKY47 in Col-0 background resulted in lower biomass, less chlorophyll content, and increased sensitivity to B toxicity. More importantly, the B concentration in shoots was higher in the overexpression lines and lower in the Atwrky47 mutants than in Col-0 plants, respectively. These results demonstrate that AtWRKY47 gene plays a key role in regulating plant tolerance to B toxicity.
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