ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Calcium-mediated postharvest changes in texture and cell wall structure and composition in Golden Delicious apples.

Glenn, G. M.; Poovaiah, B. W.;

Journal of the American Society for Horticultural Science Year: 1990 Vol: 115 Issue: 6 Pages: 962-968 Ref: 33 ref.

1990

บทคัดย่อ

Changes in texture, cell wall structure and composition during storage of Golden Delicious apples vacuum-infiltrated with 4% CaCl2 or of untreated fruits were investigated. The cell wall region of treated fruits showed no swelling during storage and cell-to-cell contact was maintained, whereas regions of the middle lamella in untreated tissue stained lightly, appeared distended, and eventually separated. In control fruits, microfibril orientation was lost in distended regions of the cell walls, especially in the outer wall region adjacent to the middle lamella. Furthermore, the middle lamella was fenestrated and in some cases was completely degraded. These changes during storage of control fruits were accompanied by a decrease in arabinose and galactose moieties of the cell wall and an increase in soluble pectin. Calcium treatment of fruits inhibited solubilization of polyuronide and arabinose moieties and reduced the loss in galactose content during storage. Tensile strength and firmness were positively correlated to Ca content of the fruit cortex. Excessive tensile stress caused tissue failure in control fruits when cells of the cortical tissue separated at the middle lamella. In contrast, cylinders of treated fruits fractured through cortical cell wells.