Abstract
RCD1 is a member of the plant-specific SRO protein family. Several SRO genes have been functionally identified in the regulation of abiotic stresses in Arabidopsis and other plant species. However, the function of SROs is largely unknown in apple (Malus×domestica). In this study, six MdSRO-encoding genes were isolated, categorized into two types and mapped to six chromosomes. The phylogenetic analysis demonstrated that the sequences of the AtSRO and MdSRO proteins are highly conserved. Subsequently, expression analysis showed that MdSRO genes had different expression profiles in different tissues and in response to various stresses. Finally, MdRCD1 was isolated for functional identification. The results showed that resistance to oxidation stress in apple calli was enhanced by MdRCD1 overexpression and weakened by MdRCD1 suppression. MdRCD1 also played a crucial role in the regulation of ROS homeostasis in transgenic apple calli and Arabidopsis. Ectopic expression of MdRCD1 significantly enhanced resistance to salt and oxidative stresses in transgenic lines. In addition, MdRCD1 also enhanced drought tolerance due to its influence on stomatal opening. Based on these results, we conclude that MdRCD1 is an important regulator in abiotic stress response.
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Acknowledgements
This research was supported by grants from NSFC (31430074 and 31601742), Ministry of Education of China (IRT15R42), and Shandong Province (SDAIT-06- 03).
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Conceived and designed the experiments: CXY XFW HHL. Performed the experiments: HHL RL. Analyzed the data: HHL RL FJQ. Contributed reagents/materials/analysis tools: YJH JFY. Wrote the paper: HHL XFW.
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The apple SRO gene family sequences have been submitted to Genome Database for Rosaceae (GDR) (https://www.rosaceae.org/), and the accession number been shown in the Table 1. All sequences of A. thaliana SRO genes are available in the Arabidopsis Information Resource (TAIR) (https://www.arabidopsis.org/index.jsp)
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Li, H., Li, R., Qu, F. et al. Identification of the SRO gene family in apples (Malus×domestica) with a functional characterization of MdRCD1 . Tree Genetics & Genomes 13, 94 (2017). https://doi.org/10.1007/s11295-017-1175-3
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DOI: https://doi.org/10.1007/s11295-017-1175-3