Abstract
Stripe rust (Sr), caused by Puccinia striiformis f. sp. tritici (Pst), is the most devastating disease that poses serious threat to the wheat-growing nations across the globe. Developing resistant cultivars is the most challenging aspect in wheat breeding. The function of resistance genes (R genes) and the mechanisms by which they influence plant-host interactions are poorly understood. In the present investigation, comparative transcriptome analysis was carried out by involving two near-isogenic lines (NILs) PBW343 and FLW29. The seedlings of both the genotypes were inoculated with Pst pathotype 46S119. In total, 1106 differentially expressed genes (DEGs) were identified at early stage of infection (12 hpi), whereas expressions of 877 and 1737 DEGs were observed at later stages (48 and 72 hpi) in FLW29. The identified DEGs were comprised of defense-related genes including putative R genes, 7 WRKY transcriptional factors, calcium, and hormonal signaling associated genes. Moreover, pathways involved in signaling of receptor kinases, G protein, and light showed higher expression in resistant cultivar and were common across different time points. Quantitative real-time PCR was used to further confirm the transcriptional expression of eight critical genes involved in plant defense mechanism against stripe rust. The information about genes are likely to improve our knowledge of the genetic mechanism that controls the stripe rust resistance in wheat, and data on resistance response–linked genes and pathways will be a significant resource for future research.
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All relevant data used and analyzed during this investigation may be obtained from the corresponding author upon reasonable request.
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ZAM, DC, NB, and SK: conceptualization; ZAM, DC, and SK conceived the idea; ZAM, DC, AKP, VS, DS, NB, DCM, VJ, TKS, MG, OPG, SK, SCB, JCP, AKS, AR, GPS. and SK: experimentation and data analysis. ZAM, DC, NB, and SK wrote the manuscript. All authors read and approved the final manuscript
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ESM 1
Supplementary Table 1: Summary of data output quality generated by RNA-seq library (DOCX 17 kb)
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Supplementary Table 2: Result of mapping statistics from trinity software using BWA (DOCX 14 kb)
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Supplementary Table 3a: Number of DEGs uniquely expressed after Pst treatment. Supplementary Table 3b: List of DEGs obtained from blast results in Triticum aestivum and Puccinia striiformis genome. (ZIP 6355 kb)
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Supplementary Table 4: Gene Ontology Details and Summary (XLSX 14 kb)
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Supplementary Table 5: KEGG pathway statistics, enrichment and distribution of differentially regulated pathways and pathway network (XLSX 46 kb)
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Supplementary Table 6: Functional annotation of DEGs involved in calcium ion signaling (XLSX 14 kb)
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Supplementary Table 7: List of WRKY transcription factors (XLSX 11 kb)
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Supplementary Table 8: List of R genes in expression heatmap, statistics of putative R gene (XLSX 76 kb)
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Supplementary Table 9: Protein-protein network degree file (XLSX 13 kb)
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Supplementary Table 10: Mapman Annotation (XLSX 134 kb)
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Supplementary Table 11: list of putative genes conferring resistance to Pst (XLSX 11 kb)
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Supplementary Figure 1 Venn diagram illustrating comparison of expression levels across 3 time points (1-12, 2-48 and 3-72 hpi) between Pst treated and non-uninoculated varieties. a) non-uninoculated DEGs b) treated DEGs c) unique DEGs after treatment (Purple colour indicates DEGs at 12 hpi, Pink colour indicates DEGs at 48 hpi and green colour indicates DEGs at 72 hpi). In addition, A-PBW343, B-FLW29, C-Control, T-treatment. Supplementary Figure 2-Venn daigram depicting the list of DEGs obtained from the blast results of Triticum aestivum and Puccinia striiformis genome. DEGs unique to both the genomes were identified. Supplementary Figure 3- Bar graph representation of gene ontology (GO) for genes differentially expressed in transcriptome analyses at different time points. Supplementary Figure 4-Transcription factors (TFs) belonging to 5 TF family along with number of genes across different time periods at a) 12 hpi b) 48 hpi and c) 72 hpi. Supplementary Figure 5- The Protein-Protein interactions obtained from string database based on analysis are represented by dots such that peach color dots indicate hub proteins and the cyan colour dots represent the interacting partners. The network is layout by degree value of the nodes. The interactions were determined by using T. aestivum as model organism and visualization was done using cytoscape. Supplementary Figure 6- Alignment of TRINITY_DN128400_c0_g3_i2 with MN334950.1 (DOCX 1741 kb)
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Mir, Z.A., Chauhan, D., Pradhan, A.K. et al. Comparative transcriptome profiling of near isogenic lines PBW343 and FLW29 to unravel defense related genes and pathways contributing to stripe rust resistance in wheat. Funct Integr Genomics 23, 169 (2023). https://doi.org/10.1007/s10142-023-01104-1
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DOI: https://doi.org/10.1007/s10142-023-01104-1