Identification and Expression Analysis of the FT Gene Family in Tobacco (Nicotiana tabacum)
ZHU Cheng-Guang1, SUN Ming-Ming1, YANG Ming-Feng1, LIU Zhong-Wei1, WANG Lei-Yang1, MA Jia-Jie2, LIU Guo-Xiang2, ZHANG Xing-Wei2, JI Yan2,*
1 Technology Center of Shandong China Tobacco Industry Co., Ltd., Jinan 250014, China; 2 Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China
Abstract：The FLOWERING LOCUS T (FT) gene family plays a critical role in regulating floral bud differentiation and is highly conserved across diverse plant species. This study conducted a genome-wide identification and systematic analysis of the FT gene family in tobacco (Nicotiana tabacum) using bioinformatics approaches, including gene structure characterization, conserved motif prediction, chromosomal localization, cis-regulatory element annotation, and expression pattern. A total of 11 FT family members (NtFT) were identified in tobacco, distributed across 3 chromosomes with preferential localization in low gene-density regions. All members harbored the conserved motif 1 and motif 4, and 73% of the members (8/11) exhibited a conserved structure consisting of 4 exons and 3 introns. Promoter cis-element analysis demonstrated that hormone-responsive elements (25.9%) and light-responsive elements (44.7%) were the most abundant. Tissue-specific expression profiling indicated that most NtFT genes were highly expressed in leaves, with only NtFT-09 showing specific expression in buds and flowers. qRT-PCR analysis of gene expression levels at different developmental stages revealed that NtFT-01, NtFT-02, NtFT-05, and NtFT-06 were significantly upregulated during the central flower opening stage (P<0.05), and their expression patterns were closely correlated with the enrichment of photoperiod- and hormone-responsive elements in the promoter regions. In contrast, NtFT-09 exhibited stage-specific expression patterns, suggesting its potential role in early floral bud differentiation. This study identifies NtFT-01, NtFT-02, NtFT-05, and NtFT-06 as core candidates driving reproductive growth and NtFT-09 as a potential regulator of floral initiation. These findings provide key genetic resources for further elucidation of the molecular regulatory mechanisms underlying flowering time in tobacco and provides a reference for future targeted editing of NtFT gene expression to develop early-flowering-resistant tobacco germplasm.
朱承广, 孙明铭, 杨明峰, 刘中威, 王磊阳, 马佳洁, 刘国祥, 张兴伟, 籍燕. 烟草FT基因家族鉴定与表达分析[J]. 农业生物技术学报, 2026, 34(9): 1913-1924.
ZHU Cheng-Guang, SUN Ming-Ming, YANG Ming-Feng, LIU Zhong-Wei, WANG Lei-Yang, MA Jia-Jie, LIU Guo-Xiang, ZHANG Xing-Wei, JI Yan. Identification and Expression Analysis of the FT Gene Family in Tobacco (Nicotiana tabacum). 农业生物技术学报, 2026, 34(9): 1913-1924.
[1] 常丽丽, 吴连成, 库丽霞, 等. 2008. 植物FLOWERING LOCUS T/TERMINAL FLOWER1基因家族的研究进展[J]. 西北植物学报, (04): 4843-4851. (Chang L L, Wu L C, Ku L X, et al. 2008. Advances in the FLOWERING LOCUS T/TERMINAL FLOWER1 gene family of plant[J]. Acta Botanica Boreali-Occidentalia Sinica, (04): 4843-4851.) [2] 刘合霞, 刁慧玲, 舒杨, 等. 2021. 基于转录组的金花茶PEBP基因家族的鉴定及分析[J]. 安徽农业科学, 49(13): 103-107. (Liu H X, Diao H L, Shu Y, et al.2021. Transcriptome-wide identification and expression profiling of PEBP gene family in Camellia nitidissima[J]. Journal of Anhui Agricultural Sciences, 49(13): 103-107.) [3] 马政. 2023. Aux/IAA基因家族的起源和进化轨迹及其部分植物功能预测和表达分析[D]. 硕士学位论文, 四川农业大学, 导师: 姚慧鹏, pp. 9-13. (Ma Z.2023. Origin and evolution of the Aux/IAA gene family and function prediction andexpression analysis of partial plants[D]. Thesis for M.S., Sichuan Agricultural University, Supervisor: Yao H P, pp. 9-13.) [4] 孙辉, 韩福生. 2009. 蛋氨酸硫氧化物还原酶研究进展[J]. 国际病理科学与临床杂志, 29(05): 441-444. (Sun H, Han F S, et al.2009. Progress in the research on methionine sulfoxide reductases[J]. International Pathology and clinic, 29(05): 441-444.) [5] 王敬丹. 2023. 小麦FT/TFL1基因家族的生物信息学分析与TaFT3的功能鉴定[D]. 硕士学位论文, 山东农业大学, 导师: 安海龙, pp. 17. (Wang J D. 2023. Bioinformatics Analysis of Wheat FT/TFL1 Gene Family andFunctional Identification of TaFT3[D]. Thesis for M.S., Shandong Agricultural University, Supervisor: An H L, pp. 17.) [6] 赵泽玉, 杜甫, 李子玮, 等. 2024. 普通烟草HSP20基因家族成员鉴定及表达分析[J]. 中国烟草学报, 30(04): 74-83. (Zhao Z Y, Du F, Li Z W, et al.2024. Identification and expression analysis of HSP20 gene family members in common tobacco[J]. Acta Tabacaria Sinica, 30(04): 74-83.) [7] Ahn J H, Miller D, Winter V J, et al.2006. A divergent external loop confers antagonistic activity on floral regulators FT and TFL1[J]. Embo Journal, 25(3): 605-614. [8] Asaf S, Khan A L, Khan A R, et al.2016. Complete chloroplast genome of Nicotiana otophora and its comparison with related species[J]. Frontiers in Plant Science, 7: 843. [9] Chen C, Chen H, Zhang Y, et al.2020. TBtools: An integrative toolkit developed for interactive analyses of big biological data[J]. Molecular Plant, 13(8): 1194-1202. [10] Corbesier L, Vincent C, Jang S, et al.2007. FT protein movement contributes to long-distance signaling in floral induction of Arabidopsis[J]. Science, 316(5827): 1030-1033. [11] Duvaud S, Gabella C, Lisacek F, et al.2021. Expasy, the Swiss bioinformatics resource portal, as designed by its users[J]. Nucleic Acids Research, 49(W1): W216-W227. [12] Guo Y, Hans H, Christian J, et al.2014. Mutations in single FT- and TFL1-paralogs of rapeseed (Brassica napus L.) and their impact on flowering time and yield components[J]. Frontiers in Plant Science, 5: 282. [13] Hanzawa Y, Money T, Bradley D.2005. Single amino acid converts a repressor to an activator of flowering[J]. Proceedings of the National Academy of Sciences of the USA, 102(21): 7748-7753. [14] Hedman H, Kallman T, Lagercrantz U.2009. Early evolution of the MFT-like gene family in plants[J]. Plant Molecular Biology, 70(4): 359-369. [15] Karlgren A, Gyllenstrand N, Kallman T, et al.2011. Evolution of the PEBP gene family in plants: Functional diversification in seed plant evolution[J]. Plant Physiology, 156(4):1967-1977. [16] Kobayashi Y, Kaya H, Goto K, et al.1999. A pair of related genes with antagonistic roles in mediating flowering signals[J]. Science, 286(5446): 1960-1962. [17] Komiya R, Ikegami A, Tamaki S, et al.2008. Hd3a and RFT1 are essential for flowering in rice[J]. Development, 135(4): 767-74. [18] Letunic I, Bork P.2018. 20 years of the SMART protein domain annotation resource[J]. Nucleic Acids Research, 46(D1): D493-D496. [19] Lifschitz E, Eviatar T, Rozman A, et al.2006. The tomato FT ortholog triggers systemic signals that regulate growth and flowering and substitute for diverse environmental stimuli[J]. Proceedings of the National Academy of Sciences of the USA, 103(16): 6398-6403. [20] Mistry J, Chuguransky S, Williams L, et al.2021. Pfam: The protein families database in 2021[J]. Nucleic Acids Research, 49(D1): D412-D419. [21] Pin P A, Nilsson O.2012. The multifaceted roles of FLOWERING LOCUS T in plant development[J]. Plant Cell Environ, 35(10): 1742-1755. [22] Potter S C, Luciani A, Eddy S R, et al.2018. HMMER web server: 2018 update[J]. Nucleic Acids Research, 46(W1): W200-W204. [23] Riboni M, Galbiati M, Tonelli C, et al.2013. GIGANTEA enables drought escape response via abscisic acid-dependent activation of the florigens and SUPPRESSOR OF OVEREXPRESSION OF CONSTANS[J]. Plant Physiology, 162(3): 1706-1719. [24] Sun Y, Jia X, Yang Z, et al.2023. Genome-wide identification of PEBP gene family in Solanum lycopersicum[J]. International Journal of Molecular Sciences, 24(11): 9185. [25] Thakare D, Kumudini S, Dinkins RD.2011. The alleles at the E1 locus impact the expression pattern of two soybean FT-like genes shown to induce flowering in Arabidopsis[J]. Planta, 234(5): 933-943. [26] Tian Y, Wang J, Wang X, et al.2025. Genome-wide identification, phylogeny, and expression analysis of PEBP gene family in Castanea mollissima[J]. Frontiers in Genetics, 16: 1530910. [27] Wang J, Liu X, Wang Q, et al.2025. Characterization of pecan PEBP family genes and the potential regulation role of CiPEBP-like1 in fatty acid synthesis[J]. Plant Science, 351: 112326. [28] Wickland D P, Hanzawa Y.2015. The FLOWERING LOCUS T/TERMINAL FLOWER 1 gene family: Functional evolution and molecular mechanisms[J]. Molecular Plant, 8(7): 983-997. [29] Xi W, Liu C, Hou X, et al.2010. MOTHER OF FT AND TFL1 regulates seed germination through a negative feedback loop modulating ABA signaling in Arabidopsis[J]. Plant Cell, 22(6): 1733-1748. [30] Yu-Jeong K,Jeong M H,Minkyu P, et al.2024. Conserved and unique features of pepper FLOWERING LOCUS T-like genes revealed by comparative analysis among solanaceous crops[J]. Scientia Horticulturae, 326:112710. [31] Zhao C, Zhu M, Guo Y, et al.2022. Genomic survey of PEBP gene family in rice: Identification, phylogenetic analysis, and expression profiles in organs and under abiotic stresses[J]. Plants (Basel), 11(12): 1576.
