Abstract:

Olive leaves began to fall off from branches in early October, between early November and end of December was the peak stage of lear abscission, up to next February, over 95%biennial leaves detached from branches.This lear abscission law was very different with original region of olive.During Ieaf abscission phase, SOD activity was quickly decreased, in biennial leaves, the SOD activity decreased from 280μg^-1 FW in early October to 130μg^-1 FW in early December, and productivity increased from 7.1×10^-2μmol·g^-1 FW in early October to 31.4×10^-2μmol·g^-1 FW in middle November, afterwards, it decreased.The lipid peroxidation was increased, MDA content increased from 13 nmol·g^-1 FW in early October to 41 nmol·g^-1 FW in middle November.During leaf abscission phase, the total polyamines content was quickly decreased, which in biennial leaves from 42.5μg·g^-1 FW in early October to 18.6μg·g^-1 FW in early November, among 3 polyamines, putrescine relative content was increased, the relative content of spermidine and spermine was decreased.

Key words: Olive, Leaf abscission, Superoxide radical, Polyamine