جستجوی مقالات مرتبط با کلیدواژه "استیلبن ها" در نشریات گروه "باغبانی"

In this research, the effect of foliar application of potassium sulfate (0, 1500 and 3000 mg/l) and gibberellic acid (0, 30, 60 and 90 mg/l) on yield and its components and qualitative and antioxidant capacity of ‘Bidaneh Sefid’ grapevine were investigated. This study was conducted factorially based on randomized complete block design in a vineyard at Malayer town. Vines were sprayed during three stages including of a week before bloom, two and four weeks after bloom. Based on results, the content of berry TSS, anthocyanin, ascorbic acid and antioxidant capacity was found to be highest in K2SO4 at 3000 mg/L in combination with GA3 at 30 ppm treatment. Also, the highest berry total phenol and flavonoid content were related to 3000 mg/L K2SO4 treated- vines in combined to GA3 at 60 and 90 mg/l, respectively. Moreover, the highest berry sucrose and glucose content were related to those vines treated with 3th levels of K2SO4 and 2th levels of GA3 combination treatment. Foliar application of K2SO4 improved berry resveratrol and viniferin concentration in GA3-treated vines and berry stilbenes increased with increased K2SO4 doses. The highest activity of catalase, guaiacol peroxidase and ascorbate peroxidase antioxidant enzymes were observed in vines treated with K2SO4 at 3000 mg/l in combination with GA3 at 90 mg/l. Totally, foliar application of K2SO4 especially at 3000 mg/l in combination with moderate doses of GA3 improved the yield, accumulated dry matter, increased the sugar content and the antioxidant capacity of the grape berries.

Nutrition management in growth season has a main effect on production and accumulation of secondary metabolites in grapevine berries. In this research the effects of foliar application of potassium sulfate (K; 0, 1.5, and 3%) and iron chelate (Fe; 0, 0.5, and 1%) on accumulation of resveratrol and viniferin and antioxidant capacity of ‘Bidaneh Sefid’ grape berries was evaluated. This study was carried out as a factorial experiment based on completely randomized block design in commercial vineyard located in Malayer city during 2016-2017. The fruits were harvested based on maturity index. Some characteristics of berries such as flavonoids, total phenols, anthocyanin, vitamin C, resveratrol, viniferin, antioxidant capacity, catalase, guaiacol peroxidase, and ascorbate peroxidase were measured. Based on the results, the highest berry total anthocyanin and vitamin C was related to sprayed vines with 1% Fe- EDDHA and 1.5% potassium sulfate in solely respectively. The highest total phenol observed in vines sprayed with 1.5% potassium sulfate in combination with 1% Fe- EDDHA. However, the lowest total phenol content was found in control vines. The highest berries resveratrol and viniferin concentration was observed in vines sprayed with moderate doses of both fertilizers. Moreover, berry antioxidant capacity of vines treated with moderate doses of both fertilizers was found to be highest. Nutrient -treated vines with both fertilizers at third level showed the higher guaiacol peroxidase in compared to others plants. The highest catalase activity of berries was related to vines treated with 3% potassium sulfate in combination with 0.5% Fe- EDDHA. However, the maximum ascorbate peroxidase was obtained with 1.5% potassium sulfate in combination with Fe-EDDHA at 0.5% concentrations. The lowest activity of all enzymes was obtained in control un-treated vines.