ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of modification of storage atmosphere on phospholipids and ultrastructure of cauliflower mitochondria.

Romo-Parada, L.; Vezina, L. P.; Charest, P. M.; Castaigne, F.; Willemot, C.;

Physiologia Plantarum Year: 1991 Vol: 83 Issue: 4 Pages: 664-674 Ref: 28 ref.

1991

บทคัดย่อ

Differences in mitochondrial membrane composition and ultrastructure were studied after storage of cauliflower for 5 days at 25 deg C in air or under controlled atmospheres: 3% O2, 21% O2 + 15% CO2 or 3% O2 + 15% CO2. In air, postharvest senescence involved a 20% decrease in mitochondrial phospholipid content. A large reduction in the relative abundance of phosphatidylcholine (PC) and in the degree of unsaturation of PC and phosphatidyl ethanolamine (PE) was observed. However, the degree of unsaturation increased in cardiolipin (CL). Storage under 3% O2 did not prevent phospholipid breakdown. Low O2 prevented the relative decrease in PC observed during storage in air and the loss of linoleic acid from PC, but not from PE. This relative protection offered by the low O2 atmosphere was lost under 3% O2 + 15% CO2. The high CO2 atmosphere caused twice as much loss in phospholipids as that observed during storage in air. Extensive loss of mitochondrial protein, a marked decrease in phospholipid to protein ratio, and electron micrograph observations suggest structural alterations to the mitochondrial membrane in the presence of high CO2 concentrations.