سرور عارفی

Copper, as a micronutrient, is essential for the synthesis of enzymes and proteins. However, excessive copper concentrations can be highly toxic and inhibit the photosynthetic and metabolic pathways in plants, ultimately leading to reduced biomass, delayed flowering and fruiting. Sodium nitroprusside (SNP) (as a nitric oxide donor compound) plays a significant role in plant growth and development, from germination to organ senescence, signal transduction, regulation of antioxidant defense systems, and reduction of heavy metal toxicity. In the present study, the combined effects of two levels of copper sulfate (600 and 1200 µM) and sodium nitroprusside (150 µM) were investigated on some physiological and morphological activities of okra (Abelmoschus esculentus L. cv. Clemsonspineless) is grown hydroponically. The experiments were conducted in a complete randomized design with three replications. Based on our results, the high copper concentration resulted in a reduction in chlorophyll content, essential nutrients, growth parameters and an increase in malondialdehyde, hydrogen peroxide, electrolyte leakage, total protein, proline, soluble sugars, peroxidase enzyme activity and copper content in both the roots and leaves of okra compared to the control plants. Conversely, SNP foliar spray led to an increase in total chlorophyll, uptake of essential elements, peroxidase enzyme activity and a decrease in copper concentration, malondialdehyde and hydrogen peroxide content, as well as ion leakage in okra plants. Therefore, it seems that the application of SNP was able to mitigate the negative effects of copper sulfate stress significantly and enhance the tolerance of okra plants to copper stress conditions.

Copper is an essential plant micronutrient, required for the protein components of several enzymes. Salicylic acid (SA) or orthohydroxy benzoic acid and other compounds which are belong to this group are plant phenolic that play a major role in regulation of many physiological processes e.g. growth, develoment , ion absorption and germination. In present research effect of different concentration of Copper sulfate (0,0/5,1,1/5 mM) and salicylic acid (5μM) on some physiological activities in two cultivar (Partov and Gohar) of mung bean (Vigna radiata L.) was studied, in hydroponic culture. The experiment was based on a completely randomized dosing with four replicates.We found that excess Copper, in both cultivar, cause a decrease in starch content of leaves in these plant. Proline, soluble sugar and Catalas activity enzyme was increased. Salicylic acid alleviated effect of excess Cu in leaves. We found that under cu stress Gohar is more resistant than partov cultivar.