Abstract
Spermidine (SPD), as a signal molecule, participates in the response of plants to adversity stress. In the biosynthesis of SPD, spermidine synthase (SPDS) is the key enzyme that catalyzes the synthesis of putrescine into SPD. TWO cDNA sequence coding spermidine synthases have been cloned from mulberry (MnSPDS) in the present report. Sequence analysis revealed that their ORF were 1005 and 1188bp in length, encoding 334 and 395 amino acid protein, respectively. MnSPDS genes belonged to S-adenosyl-L-methionone, AdoMet-MTase, Class I superfamily. Phylogenetic analysis of the amino acid sequences encoded by the spermidine synthase gene from different species reveals that Morus notabilis C.K. Schneid. was closely connected to Arabidopsis thaliana. MnSPDS genes expression patterns treated under drought, pathogen treatment were investigated using quantitative PCR (RT-qPCR) in real-time. The level of mRNA showed a significant change in drought and pathogen treatment compared to the standard growth environment. Especially, the peak expression of MnSPDS2 gene was 3.2 times that of MnSPDS1gene under drought stress, however, for the treatment of Botrytis cinerea, the peak of transcript level of MnSPDS1 gene was 4.2 times that of MnSPDS2 gene. These findings provide useful reference information for the molecular basis of signal transduction in mulberry trees during stress responses.
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ACKNOWLEDGMENTS
The authors are grateful to the Shanghai Biotechnology Company, for sequencing mulberry SPDS genome fragments.
Funding
This research was funded by “High-yield, high-quality and high-resistance mulberry variety selection and research on key supporting technologies” Guangxi Science and Technology Major Special Project, grant number (Guike AA19182012-2); National modern sericulture industry technology system construction special project (no. CARS-18).
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Conceived and designed the experiments: Z.X., N.H., Q.L.; performed the experiments: D.L., C.Q.,Y.Z.; analyzed the data: Q.L., Z.X., N.H., C.Q., D.L.,Y.Z.; wrote the paper: Q.L., Z.X., N.H., C.Q., D.L.,Y.Z.
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Liu, D., Zeng, Y., Qiu, C. et al. Molecular Cloning and Adversity Stress Expression Analysis of SPDS Genes in Mulberry (Morus notabilis). Russ J Plant Physiol 68, 1186–1193 (2021). https://doi.org/10.1134/S1021443721060108
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DOI: https://doi.org/10.1134/S1021443721060108