Abstract
Controlled transgene expression via a promoter is particularly triggered in response to pathogen infiltration. This is significant for eliciting disease-resistant features in crops through genetic engineering. The germins and germin-like proteins (GLPs) are known to be associated with plant and developmental stages. The 1107-bp Oryza sativa root GLP2 (OsRGLP2) gene promoter fused to a β-glucuronidase (GUS) reporter gene was transformed into potato plants through an Agrobacterium-mediated transformation. The OsRGLP2 promoter was activated in response to Fusarium solani (Mart.) Sacc. and Alternaria solani Sorauer. Quantitative real-time PCR results revealed 4–5-fold increase in promoter activity every 24 h following infection. There was a 15-fold increase in OsRGLP2 promoter activity after 72 h of F. solani (Mart.) Sacc. treatment and a 12-fold increase observed with A. solani Sorauer. Our results confirmed that the OsRGLP2 promoter activity was enhanced under fungal stress. Furthermore, a hyperaccumulation of H2O2 in transgenic plants is a clear signal for the involvement of OsRGLP2 promoter region in the activation of specific genes in the potato genome involved in H2O2-mediated defense response. The OsRGLP2 promoter evidently harbors copies of GT-I and Dof transcription factors (AAAG) that act in response to elicitors generated in the wake of pathogen infection.
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Acknowledgments
We are thankful to the Higher Education Commission, Islamabad, Pakistan for providing financial assistance. We are grateful to the Centre for Integrative Legume Research—CILR lab, the University of Queensland, Australia for the qRT-PCR facility and to the Queensland Plant Pathology Herbarium, Australia for providing the potato-specific fungal strains.
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Munir, F., Hayashi, S., Batley, J. et al. Germin-like protein 2 gene promoter from rice is responsive to fungal pathogens in transgenic potato plants. Funct Integr Genomics 16, 19–27 (2016). https://doi.org/10.1007/s10142-015-0463-y
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DOI: https://doi.org/10.1007/s10142-015-0463-y