the fall of the leaves generally used the word abscission (abscission) hair loss will occur at the junction (special specific layer) called the seam of the leaves. (abscission layers) or abscission zone (bascission zones) by ethylene will influence the gene expression of enzymes hydrolyzed to build 50. (hydrolytic enzymes), especially the enzyme cellulase to decompose cellulose on the cell wall. The cell wall widely Island loose crevasse and fall out eventually.