Increase of ascorbic acid content and nutritional quality in spinach leaves during physiological acclimation to low temperature |
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| Authors: | Simona Proietti Stefano Moscatello Franco Famiani Alberto Battistelli |
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| Affiliation: | 1. Istituto di Biologia Agroambientale e Forestale (IBAF), Consiglio Nazionale delle Ricerche (CNR), Viale Marconi 2, 05010 Porano (TR), Italy;2. Dipartimento di Scienze Agrarie e Ambientali, Università degli Studi di Perugia –Borgo XX Giugno, 74, 06121 Perugia, Italy;1. Department of Botany, Government College University, Faisalabad (38000), Pakistan;2. Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan;3. Department of Environmental Sciences and Engineering, Government College University, Faisalabad, Pakistan;1. Laboratory of Plant Molecular Biology, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, Henan 455000, China;1. Departamento de Biología de Organismos y Sistemas, University of Oviedo, Catedrático Rodrigo Uría s/n, 33071 Oviedo, Spain;2. Instituto Universitario de Biotecnología de Asturias, Spain;1. Ataturk University, Department of Agricultural Structures and Irrigation, 25240, Erzurum, Turkey;2. USDA-ARS Salinity Laboratory, 450 W. Big Springs Road, Riverside, CA 92507, USA;1. Federal University of Santa Maria (UFSM), Av. Presidente Vargas, 1958, 96506-302 Cachoeira do Sul, Rio Grande do Sul, Brazil;2. LASEFI/DEA/FEA (School of Food Engineering)/UNICAMP (University of Campinas), Rua Monteiro Lobato, 80, 13083-862 Campinas, São Paulo, Brazil |
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| Abstract: | The effect of acclimation to 10 °C on the leaf content of ascorbic and oxalic acids, was investigated in spinach (Spinacia oleracea L.). At 10 °C the content of ascorbic acid in leaves increased and after 7 days it was about 41% higher than in plants remaining under a 25 °C/20 °C day/night temperature regime. In contrast, the content of oxalate, remained unchanged. Transfer to 10 °C increased the ascorbic but not the oxalic acid content of the leaf intercellular washing fluid (IWF). Oxalate oxidase (OXO EC 1.2.3.4) activity was not detected in extracts of leaf blades. Therefore, oxalic acid degradation via OXO was not involved in the control of its content. Our results show that low temperature acclimation increases nutritional quality of spinach leaves via a physiological rise of ascorbic acid that does not feed-forward on the content of oxalic acid. |
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