Abstract
Key message
ZmMRPA6 was cloned and characterized as the first ATP-binding cassette (ABC) transporter in maize to be proven to participate in cold and salt tolerance. Homologous genes AtABCC4 and AtABCC14 of ZmMRPA6 also responded to salt stress.
Abstract
ATP-binding cassette (ABC) proteins are major transmembrane transporters that play significant roles in plant development against various abiotic stresses. However, available information regarding stress-related ABC genes in maize is minimal. In this study, a maize ABC transporter gene, ZmMRPA6, was identified through genome-wide association analysis (GWAS) for cold tolerance in maize seeds germination and functionally characterized. During germination and seedling stages, the zmmrpa6 mutant exhibited enhanced resistance to cold or salt stress. Mutated of ZmMRPA6 did not affect the expression of downstream response genes related cold or salt response at the transcriptional level. Mass spectrometry analysis revealed that most of the differential proteins between zmmrpa6 and wild-type plants were involved in response to stress process including oxidative reduction, hydrolase activity, small molecule metabolism, and photosynthesis process. Meanwhile, the plants which lack the ZmMRPA6 homologous genes AtABCC4 or AtABCC14 were sensitive to salt stress in Arabidopsis. These results indicated that ZmMRPA6 and its homologous genes play a conserved role in cold and salt stress, and functional differentiation occurs in monocotyledonous and dicotyledonous plants. In summary, these findings dramatically improved our understanding of the function of ABC transporters resistance to abiotic stresses in plants.
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The authors confirm that all relevant data supporting the findings of this study are available within the article and its supplementary material. Raw data that supports the findings of this study are available from the corresponding author upon reasonable request.
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Funding
This work was supported by Taishan Scholars (tsqn20161020), the National Natural Science Foundation (31871543), the Natural Science Foundation of Shandong Province (ZR2017MC065 and ZR2020QC029).
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SZ and WY designed research; XL, SY, YS, JL, LJ, and JZ performed research; JL, WY, YL, XL, and SZ analyzed data; XL, WY and SZ wrote the paper. All authors read and approved the final manuscript.
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Communicated by Kinya Toriyama.
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Yang, W., Liu, X., Yu, S. et al. The maize ATP-binding cassette (ABC) transporter ZmMRPA6 confers cold and salt stress tolerance in plants. Plant Cell Rep 43, 13 (2024). https://doi.org/10.1007/s00299-023-03094-7
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DOI: https://doi.org/10.1007/s00299-023-03094-7