Abstract
This study aimed to further clarify the mechanisms of salt-alkali tolerance in Fraxinus velutina Torr. Shoots obtained from Fraxinus velutina Torr (also known as velvet ash or Arizona ash) and of Fraxinus chinensis Roxb (controls) were planted in a greenhouse with hydroponics and 1-year-old seedlings were irrigated with 40 mM NaCl, followed by 80 mM NaCl; young leaves were then harvested and sequenced from total RNA. Differential expression gene analyses of Fraxinus velutina Torr as well as that of Fraxinus chinensis Roxb before and after treatment were conducted. The Gene Ontology biological process (GO-BP) terms and pathways enriched by overlapping genes were analyzed, and the co-expression network of them was built. A total of 454 overlapping upregulated and 278 overlapping downregulated genes were found in the two comparisons. Upregulated genes were mainly enriched in GO-BP terms of alkaloid biosynthetic process, and the pathways such as Ras signaling pathway, while downregulated genes were primarily enriched in photosynthesis and phenylpropanoid biosynthesis. The processes of phenylpropanoid biosynthesis and photosynthesis, as well as metallothionein-like protein and photosystem I P700–related proteins, appear to be involved in salt stress tolerance in Fraxinus velutina Torr.
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Funding
This work was supported by Research on Molecular Evaluation of Germplasm Resources and Development of Embryo Freezing Technology of Fraxinus L. (Project No. 2014GNC111006) and the Study on Germplasm Resources Exploration, Innovation and Utilization of Forest Tree Species (Project No. 2013BA001B06).
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Supplementary fig. 1
The co-expression network of upregulated differentially expressed genes (DEGs). The nodes are the genes, and the edges indicate the interaction between nodes. (PNG 669 kb)
Supplementary fig. 2
The co-expression network of downregulated differentially expressed genes (DEGs). The nodes are the genes, and the edges indicate the interaction between nodes. (PNG 756 kb)
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The sequencing results have been uploaded to the National Center for Biotechnology Information (NCBI) under the accession number SSR1037160.
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Yan, L., Liu, C., Wang, Y. et al. De novo transcriptome analysis of Fraxinus velutina Torr in response to NaCl stress. Tree Genetics & Genomes 15, 56 (2019). https://doi.org/10.1007/s11295-019-1340-y
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DOI: https://doi.org/10.1007/s11295-019-1340-y