Wheat Cellular Membrane Thermotolerance Under Heat Stress

Abstract

Four genotypes of Triticum aestivum L. and Triticum turgidum subsp. durum chosen according to their genetic background diversity were subjected to heat stress after anthesis. Membrane permeability, lipid peroxidation and fatty acids (C14:0, C16:0, C16:1c, C16:1t, C18:0, C18:1, C18:2 and C18:3) were quantified. The estimation of the quantum yield of non‐cyclic photosynthetic electron transport was used as well as a test system to further evaluate the implications on thylakoid functioning. It was found differences within bread and durum wheat species concerning the capability to cope with high temperatures at the stage of grain filling. The genotype Sever showed high thermal sensitivity concerning membrane lipid peroxidation and membrane permeability, as evaluated by the increased production of ethylene and MDA, as well as by the impact on TFA (at the middle term of grain filling). In the durum wheat genotypes, differences were also found, with TE 9306 displaying high membrane stability, with no increases on membrane permeability, MDA and ethylene content. In this way, the observed changes on TFA in this genotype might have constituted a mechanism to allow qualitative lipid changes, reflected in lower unsaturation level of membrane FAs which is a positive trait under high temperatures.

Correlation between total lipids, linolenic acid and membrane injury under PEG-induced dehydration in leaves of Vigna genotypes differing in drought resistance

“…On the other hand, it could be remarked that the polar headgroup also plays a role in the susceptibility of the molecule, since DGDG, the other major galactolipid of the chloroplast membrane, is also highly unsaturated, but is much less degraded under water stress conditions (Scotti-Campos et al, 2013). The fact that cell membranes of the resistant genotypes contain less C18:3 may confer them a lower susceptibility to degradative processes, as reported under high irradiation (Ramalho et al, 1998), drought (Matos et al, 2010), heat (Dias et al, 2010) and cold (Campos et al, 2003;Partelli et al, 2011) stress conditions.…”

Physiological responses and membrane integrity in three Vigna genotypes with contrasting drought tolerance

“…However there are changes in lipid composition of higher-plant membranes that may contribute to preserve membrane integrity and cell compartmentation (Kuiper, 1985), and hence to control metabolic activity (Bewley, 1993;Harwood, 1998). Such an adaptive role for qualitative and quantitative modifications of membrane lipids has been reported under different environmental stresses, namely high irradiance (Ramalho et al 1998), cold (Ö quist 1982;Partelli et al, 2011), heat (Dias et al, 2010) and drought Matos et al, 2010).…”

AtCYP710A1gene-mediated stigmasterol production plays a role in imparting temperature stress tolerance inArabidopsis thaliana

“…[1][2][3][4] Membrane stability positively influences various physiological traits such as water use efficiency 5 and osmotic potential 6 that condition plants to abiotic stresses. These traits can also influence photosynthesis and other metabolic activities that can affect yield.…”