Effect of Cold Stress on the Content of Minerals and Water Soluble Vitamins in Spinach (Spinacia oleracea)

Abstract

To assess the effect of cold stress on the levels of minerals (C, N, P, K, Ca, Mg, Mn, Zn, Cu and Fe) and water soluble vitamins (B1, B2, B3, B5, B6, B9 and C) in spinach, an experiment was set up under greenhouse conditions and compared to field results. Levels of macro and micronutrients, except iron in spinach were unaffected by growth conditions and cold stress. The abundance of water soluble vitamins were most pronounced in greenhouse grown plants exposed to 14 and 21 days of cold stress. Significant increases in vitamin C (from 22.73 to 34.47 mg 100 g -1 dry matter) accumulation in stressed plants were observed, thus highlighting its role in plant defense mechanisms. Results indicate that cultivation of leafy vegetables in a greenhouse with low temperature (4 to 7°C) exposure for a shorter period (14 to 21 days) before harvest can improve the nutritional quality.

Influence of Different Growth Conditions on Saponarin, Water-Soluble Vitamins, and Mineral Content of Barley Sprouts Cultivated in Chamber System

“…또한, 새싹보리는 polyphenols, policosanol, glucosamine, GABA, saponarin 등의 이차대사산물을 다량 함유하고 있으며 이들의 생리활성에 대한 연구는 활발히 이루 어지고 있다 (Meng et al, 2015;Kowalczewski et al, 2020;Song et al, 2020). 이와 같은 식물체내 이차대사산물은 식물의 생육환경 변화에 스스로를 방어하기 위해 합성이 되기 때문에 온도, 광, 수분 등의 외부 환경조건 조절에 의한 이차대사산물 함량 변화에 대한 연구가 활발히 진행되고 있다 (Nezval et al, 2017;Chun et al, 2019;Chung et al, 2019;Yoon et al, 2019;Jiang et al, 2020;Lee et al, 2020). 또한, 품종과 발아기간에 따른 새싹보리 내 이차대사산 물 함량 차이에 관한 연구결과도 보고되고 있다 (Lee et al, 2017).…”