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林业科学 ›› 2022, Vol. 58 ›› Issue (2): 148-158.doi: 10.11707/j.1001-7488.20220215

• 研究论文 • 上一篇    下一篇

短日照诱导白花泡桐顶芽死亡过程相关基因的表达

李顺福,王慧敏,房丽莎,刘震*   

  1. 河南农业大学林学院 郑州 450002
  • 收稿日期:2021-02-03 出版日期:2022-02-25 发布日期:2022-04-26
  • 通讯作者: 刘震
  • 基金资助:
    教育部高等学校博士学科点专项科研基金“南方系冬休眠类型树木冬芽休眠机理的研究”(20080466002)

Gene Expression Related to Terminal Bud Death Induced by Short-Day in Paulownia fortunei

Shunfu Li,Huimin Wang,Lisha Fang,Zhen Liu*   

  1. College of Forestry, Henan Agricultural University Zhengzhou 450002
  • Received:2021-02-03 Online:2022-02-25 Published:2022-04-26
  • Contact: Zhen Liu

摘要:

目的: 对短日照诱导的白花泡桐顶芽进行转录组测序分析,探究其顶芽死亡的分子机制,为解决泡桐“冠大干低”提供理论依据。方法: 在25 ℃恒温条件下,对白花泡桐1年生苗进行短日照(SD)处理,在高生长期(SDa)、高生长停止期(SDb)、顶芽死亡发生期(SDc)3个时期进行转录组测序,并利用荧光定量PCR(qRT-PCR)测定11个差异基因的表达量,同时结合转录组信息进行验证。结果: 白花泡桐顶芽3个时期转录组测序共得到57.47 Gb数据,使用DESeq2软件进行3个时期样品间比较,共筛选出差异基因44 397条,其中注释到7大数据库(NR、NT、GO、EggNOG、KEGG、UniProt、Pfam)的基因为37 076条(83.51%)。3个时期的差异基因在KEGG上主要富集在植物激素信号通路,对顶芽死亡发生的SDc时期植物激素信号通路上差异基因的分析得出:脱落酸(ABA)激素信号的响应因子ABF下调表达,乙烯(ETH)激素信号的响应因子ERF1上调表达,油菜素内酯(BR)激素信号上编码木葡聚糖内糖基转移酶的TCH4和细胞周期特异蛋白基因CYCD3上调表达,这些基因与大多数植物芽休眠过程中表达情况不同。qRT-PCR与转录组测序结果在基因表达量差异倍数上存在偏差,但整体趋势一致,可以证明转录组结果的可靠准确。结论: 白花泡桐顶芽死亡发生期的植物激素信号转导通路中ABFERF1TCH4CYCD3基因的表达情况,使其在高生长停止后顶端分生组织细胞分裂活动仍在继续进行,此时顶端分生组织分化的叶原基展开的幼叶脱落而无法形成芽鳞包裹,导致顶芽未向休眠芽方向发展而死亡。

关键词: 白花泡桐, 顶芽死亡, 短日照, 激素信号转导通路, 转录组

Abstract:

Objective: The transcriptome sequencing analysis of Paulownia fortunei terminal bud induced by short days was carried out to explore the molecular mechanism of terminal bud death, so as to provide a theoretical basis for solving the problem of Paulownia "crown big stem low" Method: Under the condition of constant temperature of 25 ℃, the one-year-old seedlings of P. fortunei were induced by short days (SD) so that the terminal buds were in three periods: growth period (SDa), growth cessation period (SDb), and terminal bud death period (SDc). Terminal buds of each period were tested for transcriptome sequencing, and fluorescent quantitative PCR (qRT-PCR) was used to verify the expression of 11 genes. Result: A total of 57.47 Gb clean data were obtained from the transcriptome sequencing of P. fortunei. A total of 44 397 differentially expressed genes were screened out by comparing the samples of three periods using the software DESeq2. Among them, 37076 genes (83.51%) were annotated into seven databases (NR, NT, GO, EggNOG, KEGG, UniProt, Pfam). KEGG pathway enrichment analysis showed that the main enrichment was in the plant hormone signaling pathway. Through the analysis of the expressed genes in the plant hormone signaling pathway of SDc during the terminal bud death stage, it was concluded that the abscisic acid (ABA) signal transduction factor ABF was down-regulated, the ethylene (ETH) signal transduction factor ERF1 was up-regulated, brassinolide(BR) hormone signal transduction of TCH4 encoding xyloglucan endoglycosyltransferase and cell cycle-specific protein gene CYCD3 were up-regulated, which were different from those in most plants during bud dormancy. The result of qRT-PCR and transcriptome sequencing had deviation, but the overall trend was consistent, which proved that transcriptome sequencing result were correct and reliable. Conclusion: The expression of ABF, ERF1, TCH4 and CYCD3 in the plant hormone signal transduction pathway may lead to the continued division and differentiation of the shoot apical meristem in SDc. At the same time, the young leaves that wrapped the apical meristem fall off, so that the terminal bud of Paulownia fortunei cannot form dormant buds and result in death.

Key words: Paulownia fortunei, terminal bud death, short day, hormone signal transduction, transcriptome

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