Calcium delays senescence-related membrane lipid changes and increases net synthesis of membrane lipid components in shredded carrots
G. A. Picchioni, A. E. Watada, B. D. Whitaker and A. Reyes
Postharvest Biology and Technology Vol: 9 Issue: 2 Pages: 235-245
1996
บทคัดย่อ
The influence of Ca2+ on firmness and membrane lipid structural components was evaluated during storage of shredded (wound-stressed) carrot tissues (Daucus carota L. `Caropak'). During 10 days of storage at 10°C and 95% RH, Ca2+ treatment (applied as 1% w/v CaCl2 upon shredding) provided 6-16% greater firmness retention than did a water control treatment. Calcium accentuated net increases in total phospholipid and monogalactosyldiacylglycerol concentrations after 4 and 10 days of storage, and in acylated steryl glycoside concentrations after 4 days of storage. Calcium partially counteracted a net reduction in steryl glycoside concentration which occurred following 4 days of storage, and prevented an increase in the free sterol:phospholipid ratio following 10 days of storage. Calcium preserved membrane integrity of carrot shreds not only by delaying senescence-related membrane lipid changes, but also by apparently augmenting membrane restructuring processes.