N- or/and P-deprived Coccomyxa chodatii SAG 216–2 extracts instigated mercury tolerance of germinated wheat seedlings

Abstract

Purpose This research studies the alleviation potential of N- or/and P- deprived Coccomyxa chodatii SAG 216–2 extracts as biostimulants on mercury stress (10 and 30 mg L−1) of wheat seedlings. Materials The study includes the interactive effect of mercury and biostimulants on growth, reactive nitrogen and oxygen species, membrane stability, and antioxidant activity in wheat seedlings. Results The imposed toxic effects of Hg-stress on the studied parameters were to a great extent less noticeable under different algal extracts, and the magnitude of augmentation was P-deprived extract > P-&N-deprived extract > N-deprived extract > Normal algal extract. Higher Hg-tolerance modulated by algal extracts, especially P-deprived extract, was associated with high antioxidant capacity and ferric reducing power. These activities could instigate the antioxidant system (enzymatic and non-enzymatic) under Hg-stress. Furthermore, the algal extracts broadly alleviated wheat chelating mechanism deterioration by Hg-stress via enhancing phytochelatins, reduced glutathione, and metallothioneins. Thus, the applied algal extracts retarded Hg accumulation in wheat tissues exposed to Hg stress. In addition, the nitrosative stress induced by Hg-stress in terms of high nitric oxide content was minimized by various algal extracts. All these regulations by algal extracts are reflected in high membrane stability as denoted by the reduction of lipid peroxidation, lipoxygenase, and methylglyoxal as a sign of reducing oxidative damage and reactive oxygen species (ROS). Conclusion Thus, we recommended using the macronutrient-deprived algal extracts of Coccomyxa chodatii SAG 216–2 as potential biostimulants of wheat growth under Hg-stress and may be under other stresses.

Comparative Study of Three Biological Control Agents and Two Conventional Fungicides against Coriander Damping-off and Root Rot Caused by Rhizoctonia solani

“…On the other hand, the applied biocontrol agents were able to protect the coriander cells and suppress excessive production of lipid peroxidation parallel to the reduction of H 2 O 2 similar to that reported by Bagy et al [52]. Several studies recommended that the stabilization of cell membranes is known to be correlated with abiotic and biotic stress tolerance [53][54][55][56][57]. Thus, membrane stabilization and reactive oxygen species are essential traits associated with pathogen severity and disease incidence.…”

Synergistic Effects of Kaolin and Silicon Nanoparticles for Ameliorating Deficit Irrigation Stress in Maize Plants by Upregulating Antioxidant Defense Systems

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Elevated CO2 differentially attenuates beryllium‐induced oxidative stress in oat and alfalfa

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“…The PCA and heatmap analyses also depicted significant accumulation of PCs, GSH, TGSH, MTc, and GST in both species subjected to Be and eCO 2 co-application (Figure 6). Increased MTC content affects metal transport and confined metal ions and further facilitates GSH and Be-conjugation (Alotaibi, Khamis, et al, 2021;Alotaibi, Saleh, et al, 2021;Dawood et al, 2022Dawood et al, , 2023Shabbaj et al, 2022).…”