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Effect of nitrogen source in the fertilizing solution on nutritional quality of three members of the Portulaca oleracea aggregate.
Szalai, Gabriella; Dai, Nir; Danin, Avinoam; Dudai, Nativ; Barazani, Oz.
Afiliação
  • Szalai G; Agricultural Research Institute of the Hungarian Academy of Sciences, H-2462 Martonvasar, Hungary.
J Sci Food Agric ; 90(12): 2039-45, 2010 Sep.
Article em En | MEDLINE | ID: mdl-20572061
BACKGROUND: Portulaca oleracea (purslane) is nutritious but, in addition to the essential alpha-linolenic acid, vitamin C and tocopherols, it contains undesirable oxalic acid. Knowing the effects of nitrate and ammonium on oxalate accumulation, we tested the agronomic potential of three members of the P. oleracea aggregate under various nitrogen fertilization conditions, by measuring biomass production and accumulation of fatty acids, organic acids and tocopherol in the commercial P. sativa (Pos) and two natural members: P. nitida (Pon) and P. papillato-stellulata (Pop). RESULTS: With nitrate as the sole N source, we measured differences between Pon and Pos in concentrations of the essential omega-3 fatty acid alpha-linolenic acid. Pos also gained less dry biomass under these conditions, implying a higher agronomical and nutritional value for Pon. Increasing the fertilizer ammonium concentration and reducing that of nitrate significantly decreased oxalic acid by factors of up to 1.7, 2.6 and 3.4 in Pos, Pop and Pon, respectively, significantly increased concentrations of tocopherol and malic acid, had no effect on fatty acids or ascorbic acid, but reduced biomass. CONCLUSION: In spite of the recumbent growth habit of Pon, the present findings indicate its agronomic potential. Because early flowering and seed production may be the limiting factors in purslane agriculture, growing Pon in nitrate-poor conditions might be agriculturally favorable.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Ácido alfa-Linolênico / Ácido Oxálico / Tocoferóis / Portulaca / Fertilizantes / Malatos / Nitrogênio Idioma: En Ano de publicação: 2010 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Ácido alfa-Linolênico / Ácido Oxálico / Tocoferóis / Portulaca / Fertilizantes / Malatos / Nitrogênio Idioma: En Ano de publicação: 2010 Tipo de documento: Article