บทคัดย่องานวิจัย

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Postharvest lipid loss, malate accumulation, and appearance of malate synthase activity in asparagus spear tips.

Hurst, P. L.; Irving, D. E.; Hannan, P. J.;

Postharvest Biology and Technology Year: 1994 Vol: 4 Issue: 1-2 Pages: 49-56 Ref: 30 ref.

1994

บทคัดย่อ

Postharvest lipid loss, malate accumulation, and appearance of malate synthase activity in asparagus spear tips.

ABSTRACT

Lipid levels, glyoxylate-cycle enzymes and respiratory quotients were measured in 3-cm tips of asparagus spears during 5 days of storage at 20 deg C, to determine whether lipids are mobilized as in some other senescing plant tissues. Within 12 h, the respiratory quotient dropped from near unity to 0.66 before stabilizing around 0.75 after 2 days. Over 5 days of storage, almost half of the total lipid in spear tips was lost. Malate synthase activity, which was not detectable at harvest, appeared after 1-2 days and continued to increase throughout the remaining 3 days. Malate concentration increased 3- to 4-fold in 4-5 days. Isocitrate lyase activity was not detected at any time during storage, and it is unlikely that the glyoxylate cycle functions in tips of harvested asparagus spears. These results are discussed in relation to other postharvest metabolic events in asparagus.