Membrane deterioration is an early and characteristic feature
of petal senescence of cut flowers. Increased lipid peroxidation,
mediated and sustained by phospholipid-degrading enzymes, such
as phospholipase D (PLD) and lipoxygenase (LOX), results in a
loss of membrane integrity, which has been noted in the senescing
petal tissues (Brown et al., 1990; Fobel et al., 1987).