独脚金内酯处理下粉蕉球茎中植物激素代谢与信号转导通路的表达模式分析

Expression pattern analysis of phytohormone metabolism and signal transduction pathways in the corm of Pisang Awak under strigolactones treatment

  • 摘要: 【目的】 挖掘独脚金内酯(SLs)处理下粉蕉球茎生长发育过程中激素代谢与信号转导通路的关键基因,探究SLs调控粉蕉球茎生长发育的分子机制,为深入理解SLs在植物生长发育调控网络中的作用提供理论依据。【方法】 以粉蕉品种育粉6号为试验材料,采用水培法以30 μmol/L rac-GR24(人工合成的SLs类似物)对8叶龄植株进行模拟SLs处理,以含有等量清水的营养液作为对照(CK),分别在SLs处理后第0、15、30、60、90、120 d挖取球茎,测量球茎高度和直径,并对球茎组织进行转录组测序,筛选SLs处理与CK间的差异表达基因(DEGs),对DEGs进行GO功能注释及KEGG信号通路富集分析,通过实时荧光定量PCR进行验证。【结果】 SLs处理会抑制球茎的伸长和增粗。经转录组测序获得35638662~45736762条Clean reads。DEGs筛选结果表明,在SLs处理后不同时间中,SLs处理后第15 d与CK间的DEGs数量最多,其中3943个上调,3704个下调,表明SLs处理后第15 d可能是基因表达调控的活跃时期。GO功能注释结果表明,DEGs主要涉及代谢过程、生物调节、刺激反应和生物过程调控等条目;KEGG信号通路富集分析结果表明,DEGs显著富集到植物激素信号转导、淀粉和蔗糖代谢及次生代谢物生物合成等通路。SLs处理主要影响粉蕉球茎细胞分裂素(CTK)、吲哚乙酸(IAA)、脱落酸(ABA)、茉莉酸(JA)、赤霉素(GA)及油菜素内酯(BRs)代谢与信号转导通路的CKX、NCED、GA20ox、CYP707A、CYP90B等基因家族成员。实时荧光定量PCR检测结果表明,转录组测序结果具有较好的可靠性。【结论】 SLs会抑制粉蕉球茎生长,诱导球茎生长发育相关的多个激素代谢与信号转导通路共同响应,说明SLs不仅作为单一的发育信号分子,更是作为复杂植物激素调控网络中的关键节点来调控粉蕉球茎的生长发育。

     

    Abstract: 【Objective】 This study aimed to investigate key genes involved in hormone metabolism and signal transduction during corm growth and development of Pisang Awak under strigolactones (SLs) treatment and to elucidate the molecular mechanisms of SLs for regulating corm development of Pisang Awak, thereby providing theoretical basis for understanding the role of SLs in regulatory networks of growth and development of plants. 【Method】 The Pisang Awak cultivar Yufen No. 6 was used as experimental materials. Hydroponic method was adopted to treat 8-leaf-stage plants with 30 μmol/L rac-GR24 (synthetic analog of SLs) for simulating SLs treatment. The nutrient solution containing an equal volume of water served as the control (CK). Corms were collected at 0, 15, 30, 60, 90, and 120 d after SLs treatment to measure corm height and diameter.Transcriptome sequencing was performed on corm tissues to screen differentially expressed genes (DEGs) between SLs treatment and CK. GO functional annotation and KEGG signaling pathway enrichment analysis were performed for DEGs, and real-time fluorescence quantitative PCR was conducted for validation. 【Result】 SLs treatment inhibited the elongation and thickening of corm. Transcriptome sequencing generated 35638662-45736762 clean reads. Screening results of DEGs revealed that, at different time after SLs treatment, the highest number of DEGs was found between 15 d after SLs treatment and CK, with 3943 up-regulated and 3704 down-regulated genes, indicating that 15 d after SLs treatment might be the active stage of gene expression regulation. GO functional annotation showed that DEGs were mainly involved in terms including metabolic process, biological regulation, response to stimulus, and regulation of biological process; KEGG signaling pathway enrichment analysis indicated that DEGs were significantly enriched pathways such as plant hormone signal transduction, starch and sucrose metabolism, and secondary metabolite biosynthesis. SLs treatment primarily affected gene family members involved in the metabolism of cytokinins (CTK), indole-3-acetic acid (IAA), abscisic acid (ABA), jasmonic acid (JA), gibberellins (GA), and brassinosteroids (BRs) and CKX, NCED, GA20ox, CYP707A, and CYP90B. Real-time fluorescence quantitative PCR results confirmed the reliability of the transcriptome sequencing data. 【Conclusion】 SLs can inhibit corm growth of Pisang Awak and induce coordinated responses of multiple hormone metabolic and signaling pathways associated with corm growth and development, suggesting that SLs can work not only as individual developmental signaling molecules, but also as key nodes within complex phytohormone regulatory networks controlling corm growth and development for Pisang Awak.

     

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