Protective Role of Osmolytes and Antioxidants during High Temperature Stress in Wheat

Differential Biochemical Response of Wheat Genotypes Under Temperature Stress

“…The Raj-4083 AKAW-381 and WSM-109-4 and AKAW-381 showed similar trend and at par (p < 0.05) with each other while declined intensively in PDKV-Wasim and AKAW3722 genotypes which shows their susceptibility to high temperature. Similar observations were recorded previously in wheat when seedling exposed to heat stress sub lethal to lethal temperature stress at 42°C and 45°C (21,36). Our results of Chl 'a and b' content showed that the level maintained at threshold temperature 34°C for 1 hr then after decline in all wheat genotypes.…”

“…In the present study proline increased at 30°C 1 h and 34°C 1 hr temperature stress whereas it was declined at at 38°C 2 hr and 42°C 3hr (Fig. 5) it was probably due to increased ROS production via Pro/P5C cycle as suggested previously (42) or their utilization for activation of antioxidative enzymes to avoid membrane damage as reported in wheat (21,43,44). Proline and protein content (Fig- 6) increased in wheat seedlings at temperature 15 to 25°C and again decreased above 30°C due to decreased activities of P5CS, ornithine amino transferase and proline dehydrogenase as reported previously (8, 45).…”

“…Changes under temperature induction response has been shown as a potential tool for empirical assessment for cell survival. By this technique, thermotolerant lines were identi ed from crop wheat, which showed better performance than the original population under high temperature (18,19,20,21). The present investigation involves screening of promising germplasm released by Dr. PDKV, Akola (India) for Vidarbha region of Maharashtra for their physiological and biochemical parameters (relative leaf water content, chlorophyll, carotenoids, proline content, and pro le of antioxidative enzyme) under high temperature through acclimation process by comparing with national check in order to provide the basic information to wheat breeder which may help in wheat improvement targeted to heat tolerant cultivar.…”

Exogenous Gamma-aminobutyric Acid Coordinates Active Oxygen and Amino Acid Homeostasis to Enhance Heat Tolerance in Wheat Seedlings

“…Heat stress leads to plenty of changes of physiological responses in plants, such as dehydration of cells (Hasanuzzaman et al 2013), reduction of photosynthesis (Essemine et al 2010), destruction of cell membrane structure and function (Wu and Yang 2019), and imbalance of active oxygen metabolism (Satbhai et al 2015). Reactive oxygen species (ROS) are side products of many biochemical reactions, which can be generated in plastids, peroxisomes, mitochondria, the cytosol and the apoplast and eliminated by antioxidants and some small biological molecules (Tripathy and Oelmuller 2012).…”

Characterization of Physiological Responses and Deciphering Differential Expression of Heat stress Responsive Candidate Genes in Rice under High Temperature

“…The ten wheat genotypes by gradual increase in temperature from control (25 °C) to 30 °C 1 h, 35 °C 1 h, 40 °C 2 h and 46 °C 3 h in order to investigate its effect on RWC, chlorophyll, osmolytes accumulation, lipid peroxidation and activity of antioxidants SOD, CAT, GPOX, APX and GR. Heat stress induce the activities of all five ROS and decline in RWC and chlorophyll b in NIAW-34, AKAW-4627 and NIAW-917 wheat genotype which found to be stable under heat stress (Satbhai et al, 2015). The male sterile plants were identified in M2 generation under high temperature condition (Coimbatore) and the reverted lines (with more than 60% spikelet fertility) in the low temperature region (Gudalur) were planted again in the high temperature condition to confirm their Temperature sensitive Genic male sterilirty (TGMS) nature.…”