Agronomical traits, phenolic compounds and antioxidant activity in raw and cooked potato tubers growing under saline conditions

Abstract

BACKGROUND Potato yields and tuber compositions are linked to mechanisms adopted by plants to cope with salinity and often can change after cooking. The current study aimed to evaluate the effects of salinity, variety and cooking method in the composition of potato tubers. Three potato varieties (Spunta, Bellini and Alaska) grown under distinct salt levels (T1: 2.2 ms cm−1 EC, T2: 8.5 ms cm−1 EC before electromagnetic treatment and 6.3 ms cm−1 EC after electromagnetic treatment, T3: 8.5 ms cm−1 EC) were studied. Yield and tuber quality attributes (starch, dry matter, specific density and tuber size) were evaluated. Carotenoids, total and individual phenolics determined by high‐performance liquid chromatography (HPLC), relative antioxidant capacity (RAC) and ions content were analyzed, in both raw and water boiled tubers. RESULTS Tuber yield, starch, dry matter, ions and antioxidants were significantly influenced by the salinity level and variety. The least production and the highest antioxidants were obtained under T3. Antioxidants were influenced by cooking method, the interactions treatment × cooking method and variety × cooking method. Individual phenolic compounds exhibited different response to cooking as quercetin, caffeic acid and catechin decreased significantly after boiling. However, coumaric acid increased in Alaska tubers. CONCLUSION Salinity level, variety and cooking method are important determinants of tuber yield and composition. Electromagnetic water may be useful to enhance potato production and tuber quality in areas suffering from water salinization. © 2020 Society of Chemical Industry

Electromagnetic Saline Water for Potato Growth and Water Relations

“…The present study showed that potato growth (plant height, FW and DW) and yield may be enhanced with electromagnetic saline water, depending on the assessed variety. These results agree with what [4,7]. The data of the present study may be due to the reduction of the soil sodium concentrations with electromagnetic water, by leaching it below the root zone [8].…”

“…In fact, the RWC, Ψ W and PWUE of Spunta and Alaska were higher than Bellini and were enhanced by T3. This result point to a stronger photosynthetic activity of Spunta and Alaska compared to Bellini [7]. The data also shows that the effective adjustment with proline may be a key criterion in maintaining growth under saline conditions of Alaska.…”

“…The data of the present study may be due to the reduction of the soil sodium concentrations with electromagnetic water, by leaching it below the root zone [8]. Additionally, electromagnetic fields change the physical parameters of water (salt's solubility and electrolytic potential), which improved water and nutrient uptake, and therefore plant growth [7]. Spunta and Alaska were more responsive to electromagnetic saline water while Bellini plant height and DW were not affected by T3.…”

Evaluation of Trigonella foenum-graecum L. Plant Food Safety after Lead Exposure: Phytochemical Processes

“…Samples were prepared as reported by Akrimi et al [ 53 ]. Notably, each extract (2 mL) was filtered with a syringe PTFE filter (0.45 μm) (Albet, Barcelona, Murcia, Spain) and injected into the HPLC system (Thermo Finnigan Surveyor, Waltham, MA, USA), equipped with a UV–VIS detector.…”

Sodium metabisulfite dipping, hot water blanching and sulfur fumigation impact on the nutritional quality of dried apricot (Prunus armeniaca L.) cultivars

“…The absorbance was measured at 525 nm and the results were expressed as mg of ascorbic acid (AsA) per 100 g of DW. For the carotenoid content, the extract was diluted with acetonehexane (4:6), and measured at the absorbance of 663, 645, 505 and 453 nm as described in 20 .…”