Abstract
Global Climate change has adversely affected the production and productivity of agriculturally important crops. Wheat, being staple food grain crop, is highly sensitive to terminal heat stress. The mechanism of heat stress tolerance has yet not been elucidated in wheat. The tolerance against heat stress has been reported to be quantitative trait controlled by large number of genes/QTLs. Various studies have resulted in detection of about 500 QTLs for various traits associated with heat stress tolerance on all the 21 chromosomes, maximum on 3B. Plants have developed very diverse signal networks and out of all the signalling pathways known and characterized, Ca2+-secondary messenger linked pathways are very predominant in plants. Ca2+-binding proteins have been classified into calcium-dependent protein kinases (CDPKs), calmodulins and calcineurin B-like proteins. CDPK, being prominent member, showed the presence of N-terminal domain (which is variable), a protein kinase domain (shows phosphorylation activity), an auto-inhibitory region and a calmodulin-like domain with EF-hand Ca2+-binding sites. CDPKs have been characterized to play very important role in the regulation of guard cells and in ABA-regulated stomatal signalling in Arabidopsis. OsCDPK7 and OsCDPK13 present in rice have been reported to modulate the tolerance level against cold, salt and drought stresses. CDPKs have also been identified to protect plants against abiotic stresses through regulating oxidative damage or ROS homeostasis. The actual sensory and signalling molecules and/or the primary targets of CPKs mediated regulation of photosynthesis and carbon assimilation metabolism under the heat stress are still unclear. It is worthwhile to examine the role of CDPKs in altering the photosynthesis and source to sink carbon transfer in wheat under heat stress.
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Acknowledgements
We duly acknowledge the support received from Dr. Dwijesh Mishra, scientist, ICAR-Indian Agricultural Statistics Research Institute (IASRI), New Delhi in Bioinformatic characterization of raw data.
Funding
This research work was funded by Indian Council of Agricultural Research (ICAR) under the Extra-mural Project (Grant No 12-227 TG3321) and National Innovations in Climate Resilient Agriculture (NICRA) Project (Sanction No 12/115, TG3079).
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RRK SS: conceived the idea and drafted the topics and manuscript; JCP MKA: role of CDPK in abiotic stress tolerance; BS SG: the function of CDPK and its role in ionic and hormonal homeostasis; SP GPS: CDPK and drought stress tolerance, and uptake of nutrients; GKR GPS: the role of CDPK in salinity tolerance; RRK SP: edited the manuscript.
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Kumar, R.R., Sareen, S., Padaria, J.C. et al. Insight into Genetic Mechanism and CDPK-Based Signalling Network Underlying Balanced Source to Sink Carbon Transfer in Wheat Under Multiple Stresses. J Plant Growth Regul 42, 2443–2457 (2023). https://doi.org/10.1007/s00344-022-10715-0
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DOI: https://doi.org/10.1007/s00344-022-10715-0