Abstract
The constitutive and drought-induced activities of the Arabidopsis thaliana RD29A and RD29B promoters were monitored in soybean (Glycine max (L.) Merr.] via fusions with the visual marker gene β-glucuronidase (GUS). Physiological responses of soybean plants were monitored over 9 days of water deprivation under greenhouse conditions. Data were used to select appropriate time points to monitor the activities of the respective promoter elements. Qualitative and quantitative assays for GUS expression were conducted in root and leaf tissues, from plants under well-watered and dry-down conditions. Both RD29A and RD29B promoters were significantly activated in soybean plants subjected to dry-down conditions. However, a low level of constitutive promoter activity was also observed in both root and leaves of plants under well-watered conditions. GUS expression was notably higher in roots than in leaves. These observations suggest that the respective drought-responsive regulatory elements present in the RD29X promoters may be useful in controlling targeted transgenes to mitigate abiotic stress in soybean, provided the transgene under control of these promoters does not invoke agronomic penalties with leaky expression when no abiotic stress is imposed.
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Abbreviations
- ABA:
-
Abscisic acid
- ABRE:
-
Abscisic acid-response element
- A net :
-
Net photosynthesis (μ mol m−2 s−1)
- CBF:
-
Cold-binding factor
- CRD:
-
Completely randomized design
- DRE:
-
Dehydration-response element
- DREB:
-
Dehydration-response element-binding protein
- E :
-
Transpiration (mmol m−2 s−1)
- g s :
-
Stomatal conductance (mol m−2 s−1)
- GUS:
-
β-glucuronidase
- PAR:
-
Photosynthetically active radiation (μ mol m−2 s−1)
- SVWC:
-
Soil volumetric water content (%)
- WUE:
-
Water use efficiency
- Ψw :
-
Water potential (MPa)
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Acknowledgments
This work was supported by funds proved by The Nebraska Soybean Board; an Interdisciplinary Research Program Grant, Agriculture Research Division, University of Nebraska-Lincoln (UNL); The Center for Plant Science Innovation, and The Center for Biotechnology, UNL. The authors would also like to thank the staff within Beadle Greenhouse Facility and the Plant Transformation Core Research Facility for assistance in care and establishment of transgenic soybeans described in the studies.
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Bihmidine, S., Lin, J., Stone, J.M. et al. Activity of the Arabidopsis RD29A and RD29B promoter elements in soybean under water stress. Planta 237, 55–64 (2013). https://doi.org/10.1007/s00425-012-1740-9
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DOI: https://doi.org/10.1007/s00425-012-1740-9