Abstract
Key message
Comprehensive transcriptome analysis suggested that the primary metabolism is modulated to augment the supply of substrates towards secondary metabolism operating in the glandular trichomes of Nicotiana tabacum. The comparative gene expression and co-expression network analysis revealed that certain members of transcription factor genes belonging to the MYB, HD-ZIP, ERF, TCP, SRS, WRKY and DOF families may be involved in the regulation of metabolism and/other aspects in the glandular trichomes of N. tabacum
Abstract
The glandular trichomes of Nicotiana tabacum are highly productive in terms of secondary metabolites and therefore have been projected to be used as a prognostic platform for metabolic engineering of valuable natural products. For obvious reasons, detailed studies pertaining to the metabolic and gene regulatory networks operating in the glandular trichomes of N. tabacum are of pivotal significance to be undertaken. We have carried out next-generation sequencing of glandular trichomes of N. tabcaum and investigated differential gene expression among different tissues, including trichome-free leaves. We identified a total of 37,269 and 37,371 genes, expressing in trichome free leaf and glandular trichomes, respectively, at a cutoff of FPKM ≥ 1. The analysis revealed that different pathways involved with the primary metabolism are modulated in glandular trichomes of N. tabacum, providing a plausible explanation for the enhanced biosynthesis of secondary metabolism in the glandular trichomes. Further, comparative gene expression analysis revealed several genes, which display preferential expression in the glandular trichomes and thereby seem to be potential candidate genes for future studies in connection to the discovery of novel trichome specific promoters. The present study also led to the comprehensive identification of 1750 transcription factor genes expressing at a cutoff of FPKM ≥ 1 in the glandular trichomes of N. tabacum. The clustering and co-expression analysis suggested that transcription factor genes belonging to HD-ZIP, ERF, WRKY, MYB, TCP, SRS and DOF families may be the major players in the regulation of gene expression in the glandular trichomes of N. tabacum. To the best of our knowledge, the present work is the first effort towards detailed identification of genes, especially regulatory genes expressing in the glandular trichomes of N. tabacum. The data resource and the empirical findings from present work in all probability must, therefore, provide a reference and background context for future work aiming at deciphering molecular mechanism of regulation of secondary metabolism and gene expression in the glandular trichomes of N. tabacum.
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Acknowledgements
PM acknowledges funding support by Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India for the project under “Scheme for Young Scientists” (SB/YS/LS-305/2013). AKN, UG, MK and MF acknowledge CSIR, DST-INSPIRE and UGC, India for Junior and senior research fellowships. The manuscript has institutional publication number CSIR-IIIM/IPR/0099.
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Conceived and designed the experiments: PM; Performed the experiments: AKN, UG, PS, MK, MF; Analyzed the data: PM, AKN. Contributed reagents/materials/analysis tools: SKL, PM; Original draft was prepared by PM. SKL edited the manuscript. PM finalized the manuscript.
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The raw read data and sample information have been submitted under Bio-project ID PRJNA561900.
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Supplementary file1 (TIF 106 kb) Figure S1: Expression analysis of trichome specific genes using qRT-PCR. The NtUbiquitin gene was used for normalization. The results are the mean of three replicates depicting mean ±SD values. The statistical significance was calculated using t-test. The asterisks *** denotes the significance of the fold change at the p-value less that 0.0001, with respect to the L sample. T, trichome sample, ML, leaf sample with trichomes, L, trichome-free leaf sample
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Supplementary file2 (DOCX 14 kb) Supplementary file S1: Tables S1 and S2 detailing the raw read and alignment summary (DOCX 14 kb)
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Supplementary file4 (XLSX 1126 kb) Supplementary file S3: Up and down-regulated genes in T as compared to L (XLSX 1127 kb)
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Supplementary file5 (XLSX 13 kb) Supplementary file S4: Over- and under-representation analysis of differentially expressed genes between T and L samples (XLSX 14 kb)
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Supplementary file6 (XLSX 195 kb) Supplementary file S5: List, expression values, SI values and fold change in expression of the genes belonging to the cluster 19
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Supplementary file7 (XLSX 68 kb) Supplementary file S6: List, expression values, SI values and fold change in expression of the genes belonging to the cluster 6
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Supplementary file8 (XLSX 151 kb) Supplementary file S7: Co-expression analysis of genes including transcription factor genes
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Supplementary file9 (XLSX 11 kb) Supplementary file S8: Putative orthologs of the selected transcription factors in tomato
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Nautiyal, A.K., Gani, U., Sharma, P. et al. Comprehensive transcriptome analysis provides insights into metabolic and gene regulatory networks in trichomes of Nicotiana tabacum. Plant Mol Biol 102, 625–644 (2020). https://doi.org/10.1007/s11103-020-00968-2
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DOI: https://doi.org/10.1007/s11103-020-00968-2