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Identification of the inducible activity in the promoter of the soybean BBI-DII gene exposed to abiotic stress or abscisic acid

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Abstract

The expression of the soybean Bowman–Birk proteinase isoinhibitor DII (BBI-DII) gene and the inducible activity of its promoter were studied under salt, drought, low temperature, and abscisic acid (ABA) exposure conditions. The BBI-DII gene was induced by salt, drought, low temperature, and ABA, and the relative expression levels were 103.09-, 107.01-, 17.25- and 27.24-fold, respectively, compared with the untreated control. The putative promoter, designated BP1 (− 1255 to + 872 bp), located 5′-upstream of the BBI-DII gene was cloned. The expression of the GUS gene in pCAM-BP1 transgenic tobacco plants was highest at 5 h after treatment with salt, drought, low temperature and ABA, especially under salt and drought. Using histochemical staining and fluorescence analysis of GUS, BP1 activity under salt and drought conditions after 5 h was 1.03 and 1.07-fold, respectively, compared with that of the CaMV35S promoter. Based on a 5′ deletion analysis, the segment (+ 41 to + 474 bp) was the basal region that responded to salt and drought, whereas the segment (− 820 to + 41 bp) was the area that responded to increased salt and drought activity. The BP2 (− 820 to + 872) activities were 0.98- and 1.02-fold compared with that of BP1 under salt and drought conditions and was 435 bp shorter than BP1. The salt- and drought-inducible activities of the BP2 promoter in the roots, stems, and leaves of transgenic tobacco plants were stable. Taken together, BP2 is more suitable than the BP1 promoter for the study and molecular breeding of stress-resistant soybean plants.

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Funding

This work was funded by the Natural Science Foundation of China (32101694), The basic research fees of the universities in the Heilongjiang Province of China (145209516), and the Graduate Innovation Research Project of Qiqihar University, China (YJSCX2021028).

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Conceived and designed the overall study experiments YZ, LSC; Performed experiments LSC, SW, KCL; Analyzed the data YZ, KCL, XZ; Wrote the manuscript YZ, LSC, JZ. All authors have read and approved the manuscript final manuscript.

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Correspondence to Yan Zhao.

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Cheng, L., Wei, S., Liu, K. et al. Identification of the inducible activity in the promoter of the soybean BBI-DII gene exposed to abiotic stress or abscisic acid. Physiol Mol Biol Plants 29, 947–957 (2023). https://doi.org/10.1007/s12298-023-01342-4

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  • DOI: https://doi.org/10.1007/s12298-023-01342-4

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