Characterization of nutrients uptake and enzymes activity in Khatouni melon (Cucumis melo var. inodorus) seedlings under different concentrations of nitrogen, potassium and phosphorus of nutrient solution. (20th January 2019)

• Record Type: Journal Article
• Authors: Pourranjbari Saghaiesh, Sakineh; Souri, Mohammad Kazem; Moghaddam, Mohammad
• Is Part Of: Journal of plant nutrition. Volume 42:Number 2(2019)
• Page Start: 178
• Page End: 185
• Publication Date: 2019-01-20
• Subjects: antioxidant enzymes -- fertilization -- nutrient elements -- physiological characteristics -- plant nutrition; Plants -- Nutrition -- Periodicals; Plants -- Effect of minerals on -- Periodicals; Deficiency diseases in plants -- Periodicals; 575.76
• DOI: 10.1080/01904167.2018.1551491
• Languages: English
• ISSNs: 0190-4167

Abstract

Abstract: A nutrient solution experiment was done to evaluate effects of different concentrations of nitrogen (N), phosphorus (P) and potassium (K) on leaf mineral concentrations and some enzymes activity of melon seedlings ( Cucumismelo var. inodorus subvar. Khatouni). Different levels of these nutrients including 0, 53, 105, 158 and 210 mg L −1 N; 0, 8, 16, 23 and 31 mg L −1 P; 0, 59, 118, 176 and 235 mg L −1 K, all corresponding to 0, 25, 50, 75 and 100% of their concentrations in Hoagland nutrient solution, were applied to plants. The results showed that the highest leaf nitrate reductase (NR) activity was observed at highest N and P levels, whereas the three highest K levels showed the highest NR activity. The highest leaf peroxidase activity was observed at 8 mg L −1 P, 59 mg L −1 K and 158 mg L −1 N. The leaf catalase activity was highest at zero concentration of P, 158 mg L −1 N and 176 mg L −1 K; however, catalase activity was decreased by increasing P levels. Leaf protein content showed an increasing trend with increasing N, P and K levels of nutrient solution, while there was no significant difference between 158 and 210 mg L −1 N. The highest leaf concentrations of N, P, K and Mg were observed at highest nitrogen, potassium and phosphorus levels of nutrient solution, whereas the highest leaf concentration of Ca were obtained at 53 or 105 mg L −1 N, 176 mg L −1 K and 23–31 mg L −1 P. The highest iron concentration of leaves was obtained from 23 to 31 mg L −1 P, 176 mg L −1 K and 210 mg L −1 N.