Journal of Integrative Agriculture ›› 2025, Vol. 24 ›› Issue (1): 176-195.DOI: 10.1016/j.jia.2024.11.003

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转录组分析揭示菊花氮素利用效率的关键调控因素

  

  • 收稿日期:2023-03-13 接受日期:2024-09-27 出版日期:2025-01-20 发布日期:2025-01-07

Comparative transcriptome analysis identifies key regulators of nitrogen use efficiency in chrysanthemum

Lijiao Ge1, 2, 3, Weihao Miao1, 2, Kuolin Duan1, 2, Tong Sun1, 2, Xinyan Fang1, 2, Zhiyong Guan1, 2, Jiafu Jiang1, 2, Sumei Chen1, 2, Weimin Fang1, 2, Fadi Chen1, 2, Shuang Zhao1, 2#   

  1. 1 College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China

    2 Key Laboratory of Landscaping, Ministry of Agriculture and Rural Affairs, Nanjing 210095, China

    3 Jiangsu Yanjiang Institute of Agricultural Sciences, Nantong 226012, China

  • Received:2023-03-13 Accepted:2024-09-27 Online:2025-01-20 Published:2025-01-07
  • About author:Lijiao Ge, E-mail: 2019104112@njau.edu.cn; #Correspondence Shuang Zhao, E-mail: zhaoshuang@njau.edu.cn
  • Supported by:

    This study was supported by the National Key R&D Program of China (2020YFD1000400), the National Natural Science Foundation of China (32072603), the Jiangsu Agriculture Science and Technology Innovation Fund, China (CX(21)2004), and the JBGS Project of Seed Industry Revitalization in Jiangsu Province, China (JBGS[2021]020).

摘要:

N)是决定菊花产量和品质的限制因子。不同基因型菊花氮利用效率(NUE)存在遗传变异。为探究影响菊花NUE的遗传因我们应用转录组技术分析了氮高效基因型‘南农丽黄’(‘LH’)和氮低效基因型‘南农雪峰’(XF)经低氮0.4 mM·L-1 N、正常氮8 mM·L-1 N)处理15 d和氮恢复处理1h(低氮处理15 d后转正常氮处理1h)的根系基因表达特征结果显示,两种基因型对不同氮处理表现出响应差异。正常氮和低氮处理下,氮高效基因型LH在农艺性状、氮累积量和谷氨酰胺合成酶活性中展现显著优势。低氮处理促进了LH的根系生长,但抑制了XF的根系生长。转录组分析发现,低氮处理增加了两基因型中部分N代谢、生长素脱落酸信号转导相关基因的表达以及‘LH’根系中赤霉素信号转导相关基因的表达氮恢复处理仅增加了LH细胞分裂素信号转导相关基因的表达。不同氮处理下,LHNRT2.1AMT1.1Gln1赤霉素和细胞分裂素信号转导相关基因的表达量均高于‘XF’,说明‘LH’根中与N代谢和激素生长素、脱落酸、赤霉素和细胞分裂素信号转导相关基因对不同氮处理响应比‘XF’更为敏感共表达网络分析结果显示,bZIP43bHLH93NPF6.3IBR10MYB62PP2CPP2C06NLP7八个枢纽基因可能是菊花氮素介导应答的关键调控因子,在氮高效基因型菊花抵御低氮胁迫、提高NUE的过程中发挥重要作用。本研究结果在遗传水平上揭示了调控菊花NUE的关键因素菊花氮高效利用这一复杂机理的理解提供了新视角同时也为菊花基因型改良和氮高效菊花基因型育种提供了有益依据。

Abstract:

Nitrogen (N) is a limiting factor that determines the yield and quality of chrysanthemum.  Genetic variation in N use efficiency (NUE) has been reported among chrysanthemum genotypes.  We performed a transcriptome analysis of two chrysanthemum genotypes, ‘Nannonglihuang’ (LH, N-efficient genotype) and ‘Nannongxuefeng’ (XF, N-inefficient genotype), under low N (0.4 mmol L–1 N) and normal N (8 mmol L–1 N) treatments for 15 d and an N recovery treatment for 12 h (low N treatment for 15 d and then normal N treatment for 12 h) to understand the genetic factors impacting NUE in chrysanthemum.  The two genotypes exhibited contrasting responses to the different N treatments.  The N-efficient genotype LH had significant superiority in agronomic traits, N accumulation and glutamine synthase activity under both normal N and low N treatments.  Low N treatment promoted root growth in LH, but inhibited root growth in XF.  Transcriptome analysis revealed that the low N treatment increased the expression of some N metabolism genes, genes related to auxin and abscisic acid signal transduction in the roots of both genotypes, as well as genes related to gibberellin signal transduction in roots of LH.  The N recovery treatment just increased the expression of genes related to cytokinin signal transduction in roots of LH.  The expression levels of the NRT2.1, AMT1.1, and Gln1 genes related to gibberellin and cytokinin signal transduction were higher in roots of LH than in XF under different N treatments, suggesting that the genes related to N metabolism and hormone (auxin, abscisic acid, gibberellin, and cytokinin) signal transduction in roots of LH are more sensitive to different N treatments than those of XF.  Co-expression network analysis (WGCNA) also identified hub genes like bZIP43, bHLH93, NPF6.3, IBR10, MYB62, PP2C, PP2C06 and NLP7, which may be the key regulators of N-mediated responses in chrysanthemum and play crucial roles in enhancing NUE and resistance to low N stress in the N-efficient chrysanthemum genotype.  These results revealed the key factors involved in regulating NUE in chrysanthemum at the genetic level, which provides new insights into the complex mechanism of efficient nitrogen utilization in chrysanthemum, and can be useful for the improvement and breeding of high NUE chrysanthemum genotypes.


Key words: chrysanthemum , genotype ,  NUE ,  gene expression ,  transcriptome analysis