Effect of increasing manganese concentration in nutrient solution on the antioxidant activity, vitamin C, lycopene and polyphenol contents of tomato fruit

Abstract

This study evaluated the effect of increasing manganese (Mn) nutrition on the content of antioxidative compounds such as vitamin C, lycopene and polyphenols, and the antioxidant activity of tomato (Lycopersicon esculentum Mill., cvs 'Alboney F1' and 'Emotion F') fruit. Plants were grown in rockwool using a nutrient solution with the following content of Mn (mg dm): 0.0, 0.3, 0.6, 1.2, 2.4, 4.8, 9.6 and 19.2. The level of vitamin C and lycopene decreased with the increasing Mn nutrition. Since the colour of fruits was correlated with the change in carotenoid content, the decrease in lycopene content promoted the reduction of redness and increase of yellowness of fruits. However, total polyphenol content and antioxidant activity significantly increased when plant were exposed to toxic levels of Mn. Observed changes could be the result of the oxidative stress induced by high concentrations of Mn. Polyphenolic compounds play a crucial role in the plant's response to Mn stress and affect predominantly the total antioxidant properties of fruits, which could be used as a source of phenolics. Moreover, total phenolic content measurement, as an easy and inexpensive method, could be used as an indicator of Mn-induced stress in fruits of tomato.

An Assessment Study of Usefulness of Using Olive (<i>Olea europaea</i> L.) Leaves in Biomonitoring the Air Pollution near Baniyas Oil Refinery, Syria: Estimating of Total Phenolic Compounds and Lead, Copper and Manganese in Olive Leaves

“…Our findings suggested a significant positive correlation (p < 0.05) between TPC and HMs (Pb and Mn) concentrations in summer and winter ( Figure 6). This result is identical with previous studies, which showed a remarkable increasing in the TPC content significantly enhanced by high level of Mn treatment [59].…”

Manganese soil and foliar fertilization of olive plantlets: the effect on leaf mineral and phenolic content and root mycorrhizal colonization

“…Brotomax is a foliar fertilizer that contains urea nitrogen, copper, manganese and zinc . An opposite trend observed at 150 DAT appears to confirm the results of study by Muzolf‐Panek et al . on tomatoes showing how different levels of Mn nutrition may lead to total phenolic levels that do not correlate linearly with increasing concentrations of Mn in nutrient solutions.…”

“…Brotomax is a foliar fertilizer that contains urea nitrogen, copper, manganese and zinc. 7 An opposite trend observed at 150 DAT appears to confirm the results of study by Muzolf-Panek et al 54 on tomatoes showing how different levels of Mn nutrition may lead to total phenolic levels that do not correlate linearly with increasing concentrations of Mn in nutrient solutions. Furthermore, it is also possible to attribute a sharp decrease in leaf total phenolic concentration and oleuropein concentration for all treatments between 90 and 150 DAT as a plant physiological response to greenhouse temperature fluctuations functioning as a stressor in this experiment.…”

Foliar Application of Copper Nanoparticles Increases the Fruit Quality and the Content of Bioactive Compounds in Tomatoes

“…The tomato fruit (Solanum lycopersicum L.) has been identified as a functional and nutraceutical food [1]. This fruit is an important source of bioactive compounds such as vitamins, carotenoids, and phenolic compounds, which produce a greater antioxidant activity that represents a direct benefit to human health [2]. Besides its importance to the human diet, it is the second most commercially consumed vegetable after the potato [3].…”