Biochemical and physiological constituents and their correlation in wheat (Triticum aestivum L.) genotypes under high temperature at different development stages

Abstract

Wheat is the most popular and staple food for millions of people. It is severely affected by heat stress in many countries. Vegetative growth and reproductive phases in wheat differ in their sensitivity to temperature. Heat tolerant (GW-190) and Heat susceptible (J-2010-11) genotypes grown up to tillering and grain filling stages and Heat treatments (40°C and 45°C for 2h and 4h) were given using Heating House. After heat treatment samples were collected, the biochemical and physiological analysis such as Protein, Proline, Glycine betaine, Membrane stability, Relative water content, Germination percent, Seed vigour and Heat tolerant index were performed. Protein, proline and glycine betaine were found significantly highest 34.06 mg/g Fr. Wt., 13.70 mg% and 902.24 µg/F. wt respectively in heat tolerant genotype GW-190 at 45°C for 4 h at tillering stage. Membrane stability and relative water content were found significantly highest 56.83% and 86.15 % respectively in heat tolerant genotype GW-190 at tillering stage. Germination percent, Seed vigor and Heat tolerance index were found higher in control group of Heat tolerant GW-190 genotypes. Where, all the biochemical and physiological contents were found lower in heat susceptible J-2010-11 genotype. From the above results it was concluded that GW-190 was heat tolerant genotypes which is suitable for grown in area of high temperature and J-2010-11 was found heat susceptible.

Water regime and osmotic adjustment under warming conditions on wheat in the Yaqui Valley, Mexico

“…Several reports stated that the effect of abiotic stress varies according to the degree of varieties tolerance (Mohammadi, 2012; Ramani et al, 2017), where some genotypes have shown different responses when exposed to the same stress condition, but an effective way to alleviate the stress intensity is achieved by increasing low density or low molecular weight proteins concentration such as RG (Khan et al, 2017). This increase occurs due to the high RG synthase enzyme activity, whose catalytic action is dependent on ATP and NAPH 2 generally coming from the photochemical phase of the photosynthetic process, an aspect that may affect plants productivity during its acclimatization and tolerance to conditions of warming stress (Tao et al, 2015).…”