Showing 24 results for Stress
Fatemeh Khakdan, Athar Sadat Javanmard,
Volume 9, Issue 3 (12-2022)
Abstract
Basil is an important medicinal plant, belonging to the Lamiaceae family. Basil is used for the treatment of different diseases such as stomachache, headache, constipation, fever and infections, as well as to reduce and regulate the blood sugar. Moreover, Basil is known for its antibacterial, antifungal and antioxidant properties. In this study, the impact of drought stress on phenols and flavonoids concentrations, as well as the antioxidant activities of leaf extract of three basil cultivars were investigated. Seeds of basil cultivars (mikhak, green, purple) were cultivated in sand-loamy soil and drought stresses (75%, 50% and 25% of the field capacity) were applied on six-leave plants. Experiments were conducted in a completely randomized design and three repeats. Total phenols, total flavonoids and flavonols concentrations of basil leaf extracts and their antioxidant activities were measured. The maximum values (with significant differences) of three groups of non-enzymatic antioxidants and the highest levels of antioxidant activities were observed for green cultivars under mild stresses (75% of the field capacity). It was observed that antioxidant activities were elevated by the increase of the concentration of the plant extract. Drought stress results in oxidative stress in basil plants. Phenols, flavonoids and flavonols are well-known as strong antioxidants have a role in the plant’s protection against the oxidative stress. In thrice cultivars of basil which were investigated, concentrations and abilities of these compounds to inhibit free radicals were decreased by the increase of the levels of drought stresses. It seems that both basil genotypes and drought stress levels affected the production of antioxidants studied and, consequently, have impacts on the plant inhibitory abilities against the oxidative stress.
Dr Seyed Reza Hashemi, Eng Negin Akhondpor, Dr Ayoub Farhadi, Eng Elnaz Arabiyan,
Volume 10, Issue 4 (12-2023)
Abstract
The aim of this study was to investigate the effective genes on apoptosis (BAX and Bcl2) in liver and intestinal cells of broiler chickens fed silver nanoparticles coated on clinoptilolite under acute heat stress induction. 450 d old broiler chicks (Cobb 500) were used in five treatments and six repetitions, and 15 pieces were used in each experimental unit in the form of a completely random design. Experimental diets were: 1) control or basal diet 2) basal diet supplemented by 1% clinoptilolite 3) basal diet supplemented by 1% clinoptilolite coated with 0.5% nanosilver 4) basal diet supplemented by 0.15% organic acid and 5) basal diet supplemented by 1% clinoptilolite coated with 0.5% nanosilver and 0.15% organic acid. Silver nanoparticles coated on clinoptilolite were investigated using XRF and FTIR techniques. In order to induce heat stress, the birds were affected by heat stress for one week in the last week of the breeding period, and on the last day of the stress, liver and intestine samples were obtained to check gene expression. The results of this experiment show that the treatments of clinoptilolite and silver nanoparticles coated on clinoptilolite have an increasing effect on the expression of Bcl2 and Bax, while this effect was not seen in the organic acid treatment. In conclusion, it could be said that if silver nanoparticles are used in feeding livestock and poultry, it is better to use organic acid supplements to reduce the side effects of silver nanoparticles.
Dr Azam Salimi, Ali Abbasi, Dr Maryam Chavoushi Rizi,
Volume 11, Issue 4 (2-2025)
Abstract
Camelina (Cruciferae), is an oilseed. Chitosan is a natural biopolymer, non-toxic, and biocompatible which favors potentially broad application in biotic and abiotic stress. Iron is an essential micronutrient for almost all living organisms because it plays a critical role in metabolic processes respiration, and photosynthesis. In this research, examined the salinity (0, 8, 12, ds/m), (0, 5/12, 7/6 g/l) chitosan (0, 0.2, 0.4, g/l) and iron (0, 3, 6, g/l) based on a randomized block design with three replications. The sodium, root growth increased significantly in salinity. The irons and growth parameters decreased because the ionic ratio has been changed. Root increased to provide water. Due to the destructive effects of salinity, the increase of sodium has also affected other parameters and caused the decrease of iron and calcium. Stress has been reduced the shoot growth by affecting the growth of the plant. In this study, the interaction of salinity, chitosan, and iron, it was observed that the stem length, biomass, RWC, ions, carbohydrates increased and the root growth decreased. It has effect on RWC, regulating ions and compatible solutes, have been able to maintain the plant's conditions like stress-free conditions reduce the effects of salinity, and help plant growth.
Naser Samsami, Jalal Jalilian, Esmaeil Gholinezhad, Raheleh Tahmasebi,
Volume 12, Issue 3 (9-2025)
Abstract
This study was conducted in a randomized complete block design with three replications with aimed to investigate the effects of different levels of salinity stress on root traits, allometric coefficient, and grain yield of Galega in three cultivation conditions (greenhouse, outdoor pots, and field) during 2024 cropping year. The results of variance analysis in greenhouse conditions showed that salinity stress had a significant effect on root diameter, root dry weight, and leaf dry weight. Specifically, salinity stress of 10 and 5 dS/m caused a 49 and 16 percent reduction in root diameter, 27 and 8 percent in root dry weight, and 49 and 10 percent in leaf dry weight, respectively. In outdoor pots, salinity stress had a significant effect on stem length, root volume, root diameter, root dry weight, stem dry weight and grain yield, and significant reductions were observed in these traits, reaching a maximum of 69% in stem dry weight. In field conditions, similar results were obtained, and salinity stress of 10 and 5 dS/m, respectively, caused a 78 and 67% reduction in grain yield and significant changes in other traits. Therefore, field cultivation conditions and lower salinity stress levels (below 5 dS/m) were superior for planting Galega.
