Storage Atmospheres Influence Chilling Injury and Chilling Injury-induced Changes in Cell Wall Polysaccharides of Cucumber

Autor:	M. Darlene Mercer, Doyle A. Smittle
Rok vydání:	1992
Předmět:	chemistry.chemical_classification biology Chemistry food and beverages Tissue Breakdown Ripening Horticulture Polysaccharide biology.organism_classification Botany Genetics Postharvest Browning Membrane fluidity Chilling injury Cucumis
Zdroj:	Journal of the American Society for Horticultural Science. 117:930-933
ISSN:	2327-9788 0003-1062
DOI:	10.21273/jashs.117.6.930
Popis:	Gemini II' cucumber (Cucumis sativus L.) fruits were stored for 2, 4, or 6 days at 5 and 6C in 1989 and for 5 days at SC or 10 days at 3C in 1990. Chilling injury (CI) symptoms were rated after 2 to 4 days at 25C. Cell wall polysaccharide concentrations in the peels and in injured and noninjured portions of the peels were determined only in 1990. High CO2 and low O2 delayed the onset of CI symptoms, but did not prevent symptom development. Chilling injury symptoms increased with longer exposure to chilling temperatures. Solubilization of cell wall poly- saccharides was associated with development of CI symptoms. Variations in low methoxyl pectinates accounted for 70% of the variation in CI. Chilling injury (CI) is the physiological damage that is in- duced in tissues when they are exposed to low but nonfreezing temperatures. About one-third of all fruits and vegetables in the U.S. market are susceptible to CI (Wang, 1989). Internal symp- toms such as leakage of ions across membranes, changes in membrane fluidity, cessation of cytoplasmic streaming, and in- hibition of electron transport (Lyons, 1973) lead to the visible CI symptoms of pitting, discoloration, water-soaking, internal browning, uneven ripening, off-flavor, tissue breakdown, and invasion by postharvest pathogens (Saltveit and Morris, 1990; Wang, 1982). The severity of CI symptoms has often been reduced, but not totally eliminated by prestorage temperature conditioning (Apeland, 1966), intermittent warming (Kader and Morris, 1975; Wang and Baker, 1979), humidity manipulation (Morris and Platenius, 1938), chemical treatments (Schiffman
Databáze:	OpenAIRE
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