Abstract
Calcium-dependent protein kinase (CDPK) is member of one of the most important signalling cascades operating inside the plant system due to its peculiar role as thermo-sensor. Here, we identified 28 full length putative CDPKs from wheat designated as TaCDPK (1-28). Based on digital gene expression, we cloned full length TaCPK-1 gene of 1691 nucleotides with open reading frame (ORF) of 548 amino acids (accession number OP125853). The expression of TaCPK-1 was observed maximum (3.1-fold) in leaf of wheat cv. HD2985 (thermotolerant) under T2 (38 ± 3 °C, 2 h), as compared to control. A positive correlation was observed between the expression of TaCPK-1 and other stress-associated genes (MAPK6, CDPK4, HSFA6e, HSF3, HSP17, HSP70, SOD and CAT) involved in thermotolerance. Global protein kinase assay showed maximum activity in leaves, as compared to root, stem and spike under heat stress. Immunoblot analysis showed abundance of CDPK protein in wheat cv. HD2985 (thermotolerant) in response to T2 (38 ± 3 °C, 2 h), as compared to HD2329 (thermosusceptible). Calcium ion (Ca2+), being inducer of CDPK, showed strong Ca-signature in the leaf tissue (Ca—622 ppm) of thermotolerant wheat cv. under heat stress, whereas it was minimum (Ca—201 ppm) in spike tissue. We observed significant variations in the ionome of wheat under HS. To conclude, TaCPK-1 plays important role in triggering signaling network and in modulation of HS-tolerance in wheat.
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Acknowledgements
We duly acknowledge the help rendered by scientists of Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India in executing the bioinformatics characterization of transcriptome data. We also thank the In-charge, National Phytotron Facility at ICAR-IARI, New Delhi for providing the growth chambers and other facilities for performing the experiments.
Funding
This work was funded by Indian Council of Agricultural Research (ICAR) under CABin project (sanction no. 21-56, TG3064) and National Innovations on Climate Resilient Agriculture (NICRA) project (Sanction no. TG-3079).
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13205_2024_3989_MOESM1_ESM.tif
Supplementary file1 Digital gene expression (DGE) analysis of identified TaCDPKs from wheat using de novo transcriptomic approach, a) Expression pattern of TaCDPKs at various developmental stages in wheat, b) Expression pattern of TaCDPKs in different tissues of wheat; Out of 28 TaCDPKs, only 18 have their probe matching in affymetrix wheat genome array, expression analyses of putative CDPK genes were performed using Genevestigator Expression Database (TIF 1044 KB)
13205_2024_3989_MOESM2_ESM.tif
Supplementary file2 Tissue specific expression analysis of important stress-associated genes (SAGs) in contrasting wheat cvs. under differential heat stress, a) Expression of SAGs in root tissues of contrasting wheat cvs., b) Expression of SAGs in stem tissues of contrasting wheat cvs., c) Expression of SAGs in leaves of contrasting wheat cvs., and d) Expression of SAGs in spike tissues of contrasting wheat cvs.; Wheat cvs. HD2985 (thermotolerant) and HD2329 (thermosusceptible) were used for the analysis; Root, stem, leaf and spike tissues were used for the analysis; T1 - 30±3°C, 2 h; T2 - 38±3°C, 2 h; β-Actin gene (acc. no. JQ004803) was used for normalizing the Ct value, Relative fold expression was calculated using Pfaffl method; all data are presented as mean ± SE of three replicates and different letters above each bar indicates significant difference between treatments (p ≤ 0.05, one-way ANOVA) (TIF 545 KB)
13205_2024_3989_MOESM3_ESM.tif
Supplementary file3 Color chart depicting the expression pattern of important stress-associated genes in wheat under differential heat stress; C-22±3°C, and HS-treated (T1 - 30±3°C, 2 h; T2 - 38±3°C, 2 h), Stress-associated genes used for the expression analysis - MAPK-6 (acc. no. MN296518), CDPK-4 (acc. no. AY704446)], HSFA6e (acc. no. KU291394), HSF3 (acc. no. JQ771755)], sHSP17 (acc. no. JN572711), HSP70 (acc. no. HM209063)], SOD (acc. no. KC158224.1), CAT (acc. no. D86327); Relative fold expression has been shown on scale of 0 to +20-fold (TIF 649 KB)
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Kumar, R.R., Niraj, R.K., Goswami, S. et al. Characterization of putative calcium-dependent protein kinase-1 (TaCPK-1) gene: hubs in signalling and tolerance network of wheat under terminal heat. 3 Biotech 14, 150 (2024). https://doi.org/10.1007/s13205-024-03989-6
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DOI: https://doi.org/10.1007/s13205-024-03989-6