Antioxidant Activity Of Lettuce Research Articles

Effect of iodine concentration on growth, iodine uptake and antioxidant activity of lettuce (Lactuca sativa L.) biofortified with iodine in nutrient film technique hydroponic system

Effect of iodine concentration on growth, iodine uptake and antioxidant activity of lettuce (Lactuca sativa L.) biofortified with iodine in nutrient film technique hydroponic system

Light supplementation and growing season affect the quality and antioxidant activity of lettuce

The light spectrum plays a major role in regulating plant growth and development, influencing photosynthesis and photo-morphogenesis. The objective was to evaluate the weight and antioxidant activity of ‘Lavinia’ lettuce (Lactuca sativa L. var. capitata L.) plants under LED lights with different red:blue ratios (R:B) used as a supplement to ambient light in a greenhouse at different seasons. Five LED light supplemented treatments were used, white (W, as control, ratio blue:green:red:far-red (B:G:R:Fr) = 30:45:20:5; 0.7:1.0), blue (B = 50:20:20:10; R:B = 0.4:1.0), white-r (Wr = 25:30:40:5; 1.6:1.0), white-R (WR = 15:15:63:7; 4.2:1.0) and red (R = 10:10:75:5; 7.5:1.0) were applied in early autumn, late autumn and winter. Immediately after transplant into the hydroponic system, lettuces plants with 3-4 true leaves (5-6 cm root length) were treated with light treatments for 14 d and harvested. In early autumn, late autumn, and winter, the PAR range applied in ambient light and supplemental lights was between 361 to 495, 222 to 304, and 297 to 407 µmol m-2 s-1, respectively. Lettuce showed the highest fresh leaf mass in early autumn compared to late autumn and winter due to the highest leaf number. In early autumn, only lettuce under the highest R:B (7.5:1.0) had a lower weight among the light treatments. Overall, lettuces supplemented with R:B between 1.6 (Wr) to 4.2 (WR) had significantly higher DM than the control (0.7:1.0). Total phenolic contents (TPC) and antioxidant capacity (AC) were highest in early autumn, followed by winter and late autumn. Light with the highest R:B (7.5:1.0) diminished TPC and AC in all growing season. This study showed that the quality of ‘Lavinia’ lettuce plants grown in early autumn under R:B between 1.6 and 4.2 improved DM, and higher red component decreased the antioxidant activity.

Dry–wet cycle changes the influence of microplastics (MPs) on the antioxidant activity of lettuce and the rhizospheric bacterial community

Dry–wet cycle changes the influence of microplastics (MPs) on the antioxidant activity of lettuce and the rhizospheric bacterial community

Effects of Illite-Containing Fertilizer Prototypes on Nutrients Uptake and Antioxidant of Lettuce (Lactuca sativa L.)

Illite, a clay mineral, contains high levels of K+ content to be available by plants. Effect of illite on soil and crops have been reported, but more examples are needed to extend to a variety of crop plants. This study was carried out to investigate the effects of illite-containing prototypes as an alternative fertilizer on nutrient uptake and antioxidant activity of lettuce. Lettuce was grown for 30 days with six different fertilizer treatments (control, NPK, illite, prototype-A, prototype-B, and prototype-C) using acidic nutrients-poor soil (AC-NPS) and alkaline nutrients-rich soil (AK-NRS). The pH adjustment by illite-containing prototypes was not observed from both two soils, AC-NPS and AK-NRS. Prototype-A resulted in an enhancement of total nitrogen content of soil at both AC-NPS and AK-NRS. Total nitrogen of lettuce shoots was remarkably higher in prototype-B and -C at both soils. Illite-only treatment showed the highest level of total ploypenols (19.5 mg g-1), flavonoids (3.8 mg g-1) and ABTS (37.2%) in the AC-NPS. Overall, illite-containing prototype B- and -C showed a significant increase not only macro nutrients (nitrogen, calcium and magnesium) but antioxidant activity in the AC-NPS. Accordingly, it is considered that illite-containing prototypes might be an alternative or supplement of chemical fertilizer to promote lettuce growth.Effect of illite-containing prototypes on total nitrogen and antioxidant ability of lettuce plant.

Precise Monitoring of Lettuce Functional Responses to Minimal Nutrient Supplementation Identifies Aquaponic System’s Nutrient Limitations and Their Time-Course

In aquaponics, a closed-loop system which combines fish and crop production, essential nutrients for plant growth are often at sub-optimal concentrations. The aim of the present study was to identify system limitations and thoroughly examine the integrated response of its components to minimal external inputs, notably crop’s functional parameters, fish performance, and microorganism profile. Lettuce and red tilapia were co-cultivated under only Fe and Fe with K supplementation and their performance was evaluated against the control of no nutrient addition. Photosynthesis, the photosynthetic apparatus state, and efficiency, pigments, leaf elemental composition, and antioxidant activity of lettuce were monitored throughout the growth period, along with several parameters related to water quality, fish growth, plant productivity and bacterial community composition. Nutrient deficiency in control plants severely impacted gas exchange, PSII efficiency, and chlorophyll a content, from day 14 of the experiment, causing a significant increase in dissipation energy and signs of photoinhibition. Fe+K input resulted in 50% and two-fold increase in lettuce production compared with Fe and control groups respectively. Nutrient supplementation resulted in higher specific growth rate of tilapias, but did not affect root microbiota which was distinct from the water bacterial community. Collectively, the results emphasize the importance of monitoring crop’s functional responses for identifying the system’s limitations and designing effective nutrient management to sustain the reduced environmental footprint of aquaponics.

Improvement of Photosynthetic Pigment Characteristics, Mineral Content, and Antioxidant Activity of Lettuce (Lactuca sativa L.) by Arbuscular Mycorrhizal Fungus and Seaweed Extract Foliar Application

Beneficial plant–microbe interaction for enhancing crop yield and quality is a sustainable way to achieve eco-friendly, desirable agricultural productions. The main objective of this experiment was to evaluate the individual and combined effects of an arbuscular mycorrhizal fungus (AMF) strain (Funneliformis mosseae) and a seaweed extract (SWE) derived from Ascophyllum nodosum, on the growth and physiological responses of lettuce (Lactuca sativa L.). Lettuce plants were inoculated with commercial AMF inoculum (5 g kg−1 soil), and SWE foliar application was done at three levels (0.5, 1.5, and 3 g L−1). The findings revealed that AMF along with SWE generated the greatest impact. In fact, co-application of AMF inoculation and 3 g L−1 SWE considerably enhanced root colonization, chlorophyll a, chlorophyll b, total chlorophyll, carotenoids, and mineral content in the shoots and roots (N, P, K, Ca, Fe, Zn, and Mn content) of lettuce plants. This combination improved initial fluorescence (F0), photochemical efficiency of PSII (FV/Fm) and Y(NO) and total antioxidant activity (TAA), whereas the maximum fluorescence, (Fm) and Y(II), showed the highest increase in lettuce plants treated with AMF and 1.5 g L−1 SWE. Furthermore, AMF inoculation along with SWE, at concentrations 1.5 and 3 g L−1, considerably enhanced variable fluorescence (FV) and the activity of water decomposition in electron donor photosystem II (FV/F0). As a result of these findings, it can be stated that the co-application of AMF and SWE positively improves the growth and development of lettuce plants.

ZINC BIOFORTIFICATION IMPROVES YIELD, NUTRACEUTICAL QUALITY AND ANTIOXIDANT CAPACITY IN LETTUCE

<p><strong>Background:</strong> Zinc (Zn) is an important element in human health and is consumed through foods of animal origin. However, the biofortification of plants with Zn can be a strategy for the consumption of this micronutrient and to increase the morphology, physiology, and plant yield. <strong>Objective:</strong> Quantify the effect of Zn application on yield, nutraceutical quality and antioxidant activity of lettuce. <strong>Methodology:</strong> Foliar application of ZnSO<sub>4 </sub>(0, 25, 50, 75 and 100 µM L<sup>-1</sup>) on lettuce plants was made. Yield, nutraceutical quality and the concentration of Zn in the plant tissue was determinate. <strong>Results:</strong> The optimum Zn dose that maximized yield and nutraceutical quality, as well as the recommended consumption concentration in lettuce in this study was 75 µM L<sup>-1</sup> (ZnSO<sub>4</sub>). <strong>Implications: </strong>Higher doses of Zn decreased bioactive compound biosynthesis. <strong>Conclusion:</strong> Zn biofortification is an alternative to increase phytochemical compound biosynthesis and yield with the possibility of improving public health.</p>

Application of biosolids to soil affects Cu and Zn accumulation and antioxidant activity of lettuce (Lactuca sativa L.)

abstractThe application of biosolids to agricultural fields is becoming increasingly common. The effect of biosolids on the behavior of metals in different plants has been reported to be variable and ambiguous. A greenhouse experiment was conducted on a soil spiked with four rates of copper (Cu) (0, 50, 100, and 150 mg kg−1) and zinc (Zn) (0, 150, 300, and 450 mg kg−1) in lettuce culture. When Cu and Zn were spiked to anaerobically-digested biosolids, their availability in lettuce increased. Root and shoot fresh weight decreased due to a decrease in photosynthetic rate. superoxide dismutase (SOD) and peroxidases (POD) activity increased after the application of Cu and Zn. The bioavailability of Zn in lettuce was greater than that of Cu because of a higher transfer factor in plants and due to a higher endogenous Zn concentration.These results will allow for better fertilization management when biosolids are applied to tomato culture.

INFLUÊNCIA DOS SISTEMAS DE CULTIVO ORGÂNICO E CONVENCIONAL NA ATIVIDADE ANTIOXIDANTE DE HORTALIÇAS

The objective of this study was to evaluate the influence of different cultivation systems on the antioxidant activity of lettuce, rocket press and chicory. Seeds from a single batch were planted using the organic and conventional systems so that their commercial maturity was reached at the same time for both systems. Methanol extracts were screened for their antioxidant activity using DPPH free radical scavenging assay. All vegetables showed antioxidant properties with some variations in the intensity of the effect, depending on the study of species and the concentration of the extract as well as the type of cultivation, which the organic system showed better effect. The highest antioxidant activity against DPPH radical was in organic rocket press followed by the organic chicory, organic lettuce, conventional rocket press, conventional chicory and conventional lettuce. Thus the consumption of vegetables is recommended particularly those coming from an organic farming as part of the diet since they can represent important source of natural antioxidants.

Total phenolic content and DPPH [rad] radical scavenging activity of lettuce ( Lactuca sativa L.) grown in Colorado

Total phenolic content (TPC) and antioxidant capacity of lettuce were evaluated using the Folin–Ciocalteu method and DPPH assay, respectively, on 25 cultivars of lettuce, including leaf, romaine, crisphead, and butterhead types, cultivated over two harvest periods. Leaf lettuce possessed the highest TPC and highest DPPH scavenging ability, followed by romaine, butterhead and Batavia (crisphead subtype). Within a lettuce type, red pigmented lettuce cultivars had higher TPC and antioxidant capacity than did green cultivars grown under the same conditions. In addition, lettuce harvested in July possessed higher TPC and antioxidant capacity than did lettuce harvested in September, suggesting that environmental conditions could influence the phenolic content and antioxidant activity of lettuce. These results suggest that Colorado grown lettuce may serve as potential dietary sources of natural phenolic antioxidants.