title: Different Citrus rootstocks present high dissimilarities in their antioxidant activity and vitamins content according to the ripening stage.
abstract: "Lane Late" sweet orange grafted on six different citrus rootstocks and grown in the Guadalquivir valley (Seville, Spain) were picked at different ripening stages in two consecutive seasons to characterize their antioxidant activity (free radicals scavenging activity, reducing power and lipid peroxidation inhibition) and quantify their main antioxidant compounds (vitamin E and vitamin C). Linear discriminant analysis and 2-way ANOVA were applied to compare the effects induced by citrus rootstock and ripening stage. The results showed that differences in antioxidant activity and related compounds are mainly dependent on the citrus rootstock, despite ripening stage had also some particular effects. Changes observed in 2012 showed less marked differences among the citrus rootstock. Nevertheless, Cleopatra rootstock showed the highest antioxidant activity in both years, indicating that an increase in its cultivation might be a good solution to sweet orange farmers. Concerning the ripening stage, samples collected in January presented higher vitamin contents, while those collected in April showed higher antioxidant activity. This result allows deciding the harvesting period according to the desired effect.
authors.affiliation: Centro IFAPA "Alameda del Obispo", Instituto de Investigación y Formación Agraria y Pesquera, Avda, Menéndez Pidal, s/n., 14071 Córdoba, Spain.
authors.forename: Vanessa
authors.initials: V
authors.lastname: Cardeñosa
authors.affiliation: Mountain Research Centre (CIMO), ESA, Polytechnic Institute of Bragança, Apartado 1172, 5301-855 Bragança, Portugal.
authors.forename: Lillian
authors.initials: L
authors.lastname: Barros
authors.affiliation: Mountain Research Centre (CIMO), ESA, Polytechnic Institute of Bragança, Apartado 1172, 5301-855 Bragança, Portugal.
authors.forename: João C M
authors.initials: JC
authors.lastname: Barreira
authors.affiliation: Centro IFAPA "Las Torres-Tomejil", Instituto de Investigación y Formación Agraria y Pesquera, Ctra Sevilla - Cazalla Km. 12,2, 41200 Alcalá del Río, Sevilla, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Arenas
authors.affiliation: Centro IFAPA "Alameda del Obispo", Instituto de Investigación y Formación Agraria y Pesquera, Avda, Menéndez Pidal, s/n., 14071 Córdoba, Spain.
authors.forename: José M
authors.initials: JM
authors.lastname: Moreno-Rojas
authors.affiliation: Mountain Research Centre (CIMO), ESA, Polytechnic Institute of Bragança, Apartado 1172, 5301-855 Bragança, Portugal. Electronic address: iferreira@ipb.pt.
authors.forename: Isabel C F R
authors.initials: IC
authors.lastname: Ferreira
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D002957:Citrus / Q000254:growth & development* / Q000378:metabolism*; D016002:Discriminant Analysis; D005638:Fruit / Q000737:chemistry; D018517:Plant Roots / Q000254:growth & development* / Q000378:metabolism*; D014815:Vitamins / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D014815:Vitamins
keywords: Antioxidant activity; Ascorbic acid; Citrus sinensis; Ripening stage rootstock; α-Tocopherol