Roles of Si and SiNPs in Improving Thermotolerance of Wheat Photosynthetic Machinery via Upregulation of PsbH, PsbB and PsbD Genes Encoding PSII Core Proteins

Photosystem II is extremely susceptible to environmental alterations, particularly high temperatures. The maintenance of an efficient photosynthetic system under stress conditions one the main issues for plants attain their required energy. Nowadays, searching alleviators goal maintaining productivity and, thereby, crop yield global climate change. Potassium silicate (K2SiO3, 1.5 mM) and silicon dioxide nanoparticles (SiO2NPs, 1.66 were used mitigate negative impacts heat (45 °C, 5 h) on wheat (Triticum aestivum L.) cv. (Shandawelly) seedlings. results showed that K2SiO3 SiO2NPs diminished leaf rolling symptoms electrolyte leakage (EL) heat-stressed leaves. Furthermore, maximum quantum photosystem (Fv/Fm) performance index (PIabs), as well pigments organic solutes including soluble sugars, sucrose, proline accumulation, increased in stressed At molecular level, RT-PCR analysis treatments stimulated overexpression PsbH, PsbB, PsbD genes. Notably, this investigation indicated was more effective improving thermotolerance compared SiO2NPs. application may be proposed approaches improve growth tolerate climatic