Abstract
Calcium acts as a signaling molecule and plays very important role in plants-tolerance to the abiotic stresses including the heat stress. We studied the effect of exogenous Ca2+ (10 mM) prior to the heat stress (42 °C, 2 h) on different molecular and biochemical parameters associated with thermotolerance in wheat (Triticum aestivum). We could observe 64 and 52 unique protein spots in HD2967 (thermotolerant) and HD2329 (thermosusceptible) cultivars under normal and heat stress condition. Similarly, 13 and 9 (HD2967) and 19 and 9 proteins (HD2329) were observed to be up-regulated and down-regulated in response to HS. MALDI-TOF-TOF/MS characterization identified the differentially expressed protein (DEP) spots as calcium dependent protein kinase (CDPK), oxygen evolving enhancer protein, HSP17, HSP70, Rubisco activase etc. Transcript profiling of identified stress-associated genes (SAGs) showed very high expression of CDPK, HSFA4a, HSP17, SOD and APX in response to Ca2+ + HS in HD2967 compared to HD2329 cultivars of wheat. Similarly accumulation of signaling molecules (H2O2 and CDPK) as well as osmolyte was observed maximum in response to Ca2+ + HS in HD2967 compared to HD2329 cultivars. Very high activities of guaiacol-peroxidase and ascorbate peroxidase were observed in Ca-treated HD2967 compared to HD2329 when exposed to HS. It is the abundance of these chaperones and antioxidant enzymes in thermotolerant cultivar which limit the accumulation of H2O2 in response to Ca2+ and HS. Exogenous Ca2+ application showed negative correlation with lipid peroxidation and positive correlation with total antioxidant capacity of the cell system under the elevated temperature. Alteration in Ca2+ efflux triggers the activities of kinases and peroxidases more in tolerant compared to susceptible cultivars which regulate the accumulation of ROS inside the cell and attenuate the lipid peroxidation process. Ultimately, it enhances the total antioxidant capacity and thermotolerance of the plants under the heat stress.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- HS:
-
Heat stress
- HSFs:
-
Heat shock transcription factors
- HSP:
-
Heat shock protein
- MDA:
-
Malondialdehyde
- qRT-PCR:
-
Quantitative real-time PCR
- SOD:
-
Superoxide dismutase
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Acknowledgment
The Author’s sincerely thanks Indian Agricultural Research Institute (IARI) and Indian Council of Agriculture Research (ICAR) for providing the financial support under the National Initiative for Climate Resilient Agriculture (NICRA) project.
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The authors declare that they have no competing interests.
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SG RRK- conceived and designed the experiments. SG RRK SKS KS- performed the transcript profiling. RG GD GKR GPS- performed biochemical estimations. SG RRK HP RDR- wrote the paper and edited the manuscript.
Equal contribution made by Suneha Goswami and Ranjeet R. Kumar.
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Table S1
List of primers used for the quantitative real-time PCR (qRT-PCR) of signaling molecules and stress-associated genes (SAGs) in HD2967 (thermotolerant) and HD2329 (thermosusceptible) cultivars of wheat in response to Ca2+ and HS (DOCX 16 kb)
Table S2
Unique protein spots identified in two dimensional electrophoresis (2-DE) gels of control (22 °C) and heat shock treated (42 °C, 2 h) samples of HD2967 (thermotolerant) cultivar of wheat; ImageMaster Platinum 7.0 (IMP7) software (GE Healthcare Life Sciences) was used for the gel characterization (DOCX 16 kb)
Table S3
Unique protein spots identified in two dimensional electrophoresis (2-DE) gels of control (22 °C) and heat shock treated (42 °C, 2 h) samples of HD2329 (thermosusceptible) cultivar of wheat; ImageMaster Platinum 7.0 (IMP7) software (GE Healthcare Life Sciences) was used for the gel characterization (DOCX 16 kb)
Fig. S1
Peptide mass fingerprinting of differentially expressed protein (DEP) spot (match ID 69) identified from the 2-DE gel using matrix-assisted laser desorption ionization - time of flight mass spectrometer (MALDI-TOF-TOF/MS), m/z data was subjected to MASCOT search (Matrix science) for the identification of protein. (DOCX 285 kb)
Fig. S2
Effects of exogenous Ca2+ and heat stress on proline accumulation and free amino acid content in thermotolerant (HD2967) and thermosusceptible (HD2329) cultivars of wheat, (a) Proline accumulation, (b) free amino acid content; T0 - 22 °C, T1 - HS of 42 °C for 2 h, T2 - Ca10mM, and T3 - Ca10mM + HS of 42 °C for 2 h; Means for varieties, treatments and interaction are significant at p = 0.05, vertical bars indicate s.e. (n = 3). (DOCX 76 kb)
Fig. S3
Effects of exogenous Ca2+ and heat stress on peroxidases activities in HD2967 (thermotolerant) and HD2329 (thermosusceptible) cultivars of wheat, (a) guaiacol peroxidase (GPX), and (b) ascorbate peroxidase (APX) activity; T0 - 22 °C, T1 - HS of 42 °C for 2 h, T2 - Ca10mM, and T3 - Ca10mM + HS of 42 °C for 2 h, Means for varieties, treatments and interaction are significant at p = 0.05, vertical bars indicate s.e. (n = 3). (DOCX 82 kb)
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Goswami, S., Kumar, R.R., Sharma, S.K. et al. Calcium triggers protein kinases-induced signal transduction for augmenting the thermotolerance of developing wheat (Triticum aestivum) grain under the heat stress. J. Plant Biochem. Biotechnol. 24, 441–452 (2015). https://doi.org/10.1007/s13562-014-0295-1
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DOI: https://doi.org/10.1007/s13562-014-0295-1