
Comparison of transcriptomic activity of Ilex integra and I. purpurea roots with NaCl treatments
ZHANG Qiang, ZHOU Peng, LIU Changlai, YU Yongfan, ZHANG Min, YANG Jiading
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (3) : 99-108.
Comparison of transcriptomic activity of Ilex integra and I. purpurea roots with NaCl treatments
【Objective】 This research aims to investigate the difference in transcriptomic activity of Ilex integra and I. purpurea roots using NaCl salt treatments and provide insights for future study on the physiological mechanisms responsible for differential salt tolerance between these Ilex species. 【Method】 Two-year-old cutting seedlings of I. integra and I. purpurea were irrigated with half-strength Hoagland solution containing 250 mmol/L NaCl for salt treatments. Root samples were collected at 0(before salt treatment), 6 and 72 h after salt treatments. The total RNAs were extracted for transcriptomic RNA-Seq. Transcripts were assembled and differentially expressed genes (DEGs) were selected. The enriched KEGG functional pathways for the two species were compared, and the expression of genes involved in certain metabolic pathways was analyzed. 【Result】 There were 2 616 and 1 802 DEGs in 6 h-salt-treated and 72 h-salt-treated I. integra roots respectively, while there were 1 831 and 3 490 DEGs in 6 h-salt-treated and 72 h-salt-treated I. purpurea roots, respectively. The common enriched KEGG functional pathways between I. integra roots with 6 and 72 h salt treatments were plant hormone signal transduction, linoleic acid metabolism, carotenoid biosynthesis and betalain biosynthesis. The common enriched pathways between I. integra roots with 6 and 72 h salt treatments were plant hormone signal transduction, phenylpropanoid biosynthesis and carotenoid biosynthesis. Betalain biosynthesis and linoleic acid/arachidonic acid metabolism are unique pathways in I. integra roots during salt treatments. There were more up-regulated putative catalase genes with much higher expression levels in salt-treated I. integra roots than that in the I. purpurea roots. 【Conclusion】 The higher salt tolerance of I. integra roots may be associated with physiological processes such as plant hormone signal transduction, carotenoid biosynthesis, betalain biosynthesis and fatty acid metabolism. The higher expression of catalase genes during salt treatments may also contribute to the higher salt tolerance of I. integra roots.
Ilex integra / I. purpurea / roots / NaCl salt treatment / transcriptomic analysis / metabolic pathway
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