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1.
Ann Bot ; 97(3): 429-41, 2006 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-16423867

RESUMO

BACKGROUND AND AIMS: A number of strawberry varieties were surveyed for their total ellagic acid concentration, and attempts were made to determine if ellagic acid and ascorbic acid concentrations of two strawberry cultivars could be increased by polythene reflective mulches. METHODS: After adjusting crop yields and cultivation using polythene mulches with two different PAR reflective capacities, field- and polytunnel-grown strawberries were analysed for ellagic acid and ascorbic acid concentrations by HPLC. Comparative measurements of yield and fruit quality were determined along with plant developmental changes. KEY RESULTS: Ellagic acid concentration varied widely with strawberry cultivar (60-341 microg g(-1) frozen weight), as did the ratio of conjugated ellagic acid : free ellagic acid. Also, there was significant year-to-year variation in total ellagic acid concentration with some cultivars. Mulches with different reflective capacities impacted on strawberry production; highly reflective mulches significantly increased growth and yield, the latter due to increases in fruit size and number. CONCLUSIONS: Highly reflective mulches significantly increased total concentrations of ellagic acid and ascorbic acid relative to control in fruit of different cultivars. The potential of agronomic practices to enhance the concentration and amounts of these important dietary bioactive compounds is discussed.


Assuntos
Ácido Ascórbico/análise , Ácido Elágico/análise , Fragaria/fisiologia , Fragaria/efeitos da radiação , Frutas/fisiologia , Frutas/efeitos da radiação , Fotossíntese/efeitos da radiação , Produtos Agrícolas/fisiologia , Ácido Elágico/química , Fragaria/classificação , Frutas/classificação , Variação Genética , Taninos Hidrolisáveis/química , Folhas de Planta/anatomia & histologia , Estações do Ano , Análise Espectral
2.
Biofactors ; 23(4): 229-34, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-16498210

RESUMO

The aim of this review is to present an outline of the physiological perspectives of beneficial antioxidant production in fruit. The drive to enhance the consumption of fruit and vegetables in the human diet is linked with positive effects of beneficial antioxidants impacting on health promotion. We briefly outline our physiological understanding of environmental processes which induce the production of reactive oxygen species and how antioxidants prevent plant cellular damage. More specifically, we describe the impact that environmental stresses, such as drought and radiation, have on the production of endogenous antioxidants and how these stresses can be incorporated into novel experimental crop growing systems to achieve high antioxidant concentrations in fruits. This includes in particular the use of irrigation application techniques and enhanced light reflectance to increase the concentrations of bioactive compounds such as ellagic acid and ascorbic acid.


Assuntos
Antioxidantes/metabolismo , Frutas/fisiologia , Antioxidantes/farmacologia , Ácido Ascórbico/biossíntese , Desastres , Ácido Elágico/metabolismo , Humanos , Espécies Reativas de Oxigênio/metabolismo , Rosaceae/genética , Rosaceae/fisiologia , Estresse Fisiológico/metabolismo
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