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Preharvest conditions can have a great impact on fruit quality attributes and postharvest responses. Firmness is an important quality attribute in pear, and excessive softening increases susceptibility to bruising and decay, thus limiting fruit postharvest life. Textural characteristics of fruits are determined at least in part by cell wall structure and disassembly. Few studies have analyzed the influence of fruit preharvest environment in softening, cell wall composition, and degradation. In the current work Bartlett pears grown either facing the sun (S) or in the shade (H) were harvested and stored for 13 days at 20 °C. An evaluation of fruit soluble solids, acidity, color, starch degradation, firmness, cell wall yield, pectin and matrix glycan solubilization, depolymerization, and monosaccharide composition was carried out. Sun-exposed pears showed more advanced color development and similar levels of starch degradation, sugars, and acids than shaded fruit. Sunlight-grown pears were at harvest firmer than shade-grown pears. Both fruit groups softened during storage at 20 °C, but even after ripening, sun-exposed pears remained firmer. Sunlight exposure did not have a great impact on pectin molecular weight. Instead, at harvest a higher proportion of water-solubilized uronic acids and alkali-solubilized neutral sugars and a larger mean molecular size of tightly bound glycans was found in sun-exposed pears. During ripening cell wall catabolism took place in both sun- and shade-grown pears, but pectin solubilization was clearly delayed in sun-exposed fruit. This was associated with decreased removal of RG I-arabinan side chains rather than with reduced depolymerization. © 2011 American Chemical Society.


Documento: Artículo
Título:Compositional changes in Bartlett pear (Pyrus communis L.) cell wall polysaccharides as affected by sunlight conditions
Autor:Raffo, M.D.; Ponce, N.M.A.; Sozzi, G.O.; Vicente, A.R.; Stortz, C.A.
Filiación:Instituto Nacional de Tecnología Agropecuaria (INTA), EEA Alto Valle de Río Negro, Ruta Nac. 22, 8332 Allen, Argentina
Departamento de Química Orgánica-CIHIDECAR, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 1428 Buenos Aires, Argentina
CONICET, Av. B. Rivadavia 1917, 1033 Buenos Aires, Argentina
Centro de Investigación y Desarrollo en Criotecnología de Alimentos, Facultad de Ciencias Exactas, Facultad de Ciencias Agrarias y Forestales, Calle 60 y 119, La Plata, 1900, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Palabras clave:hemicellulose; pectin; pome; preharvest; quality; softening; hemicellulose; pectin; pome; preharvest; softening; Carboxylic acids; Cells; Degradation; Glucose; Image quality; Solubility; Starch; Fruits; polysaccharide; article; cell wall; chemistry; growth, development and aging; metabolism; Pyrus; radiation exposure; sunlight; Cell Wall; Polysaccharides; Pyrus; Sunlight; Pyrus; Pyrus communis
Página de inicio:12155
Página de fin:12162
Título revista:Journal of Agricultural and Food Chemistry
Título revista abreviado:J. Agric. Food Chem.


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---------- APA ----------
Raffo, M.D., Ponce, N.M.A., Sozzi, G.O., Vicente, A.R. & Stortz, C.A. (2011) . Compositional changes in Bartlett pear (Pyrus communis L.) cell wall polysaccharides as affected by sunlight conditions. Journal of Agricultural and Food Chemistry, 59(22), 12155-12162.
---------- CHICAGO ----------
Raffo, M.D., Ponce, N.M.A., Sozzi, G.O., Vicente, A.R., Stortz, C.A. "Compositional changes in Bartlett pear (Pyrus communis L.) cell wall polysaccharides as affected by sunlight conditions" . Journal of Agricultural and Food Chemistry 59, no. 22 (2011) : 12155-12162.
---------- MLA ----------
Raffo, M.D., Ponce, N.M.A., Sozzi, G.O., Vicente, A.R., Stortz, C.A. "Compositional changes in Bartlett pear (Pyrus communis L.) cell wall polysaccharides as affected by sunlight conditions" . Journal of Agricultural and Food Chemistry, vol. 59, no. 22, 2011, pp. 12155-12162.
---------- VANCOUVER ----------
Raffo, M.D., Ponce, N.M.A., Sozzi, G.O., Vicente, A.R., Stortz, C.A. Compositional changes in Bartlett pear (Pyrus communis L.) cell wall polysaccharides as affected by sunlight conditions. J. Agric. Food Chem. 2011;59(22):12155-12162.