Age dependent changes of pigments in Rosa hybrida

Rosa hybrida is a perennial plant that after cut off head of the stem، lateral buds become free from apical dominance and begin to growth. In each new period of growth، new and young leaves can be formed. The four leaf samples were numbered from apex to base، showing young to mature leaf stages and some biochemical pigment markers changes were studied. The results suggest that during maturation، in addition to morphological differences، some physiological and biochemical markers are change. Data showed age dependent increase in the amount of pigments such as chlorophylls and carotenoids to reach the stage of leaf maturity to improve the leaf photosynthetic system efficiency. Gradually reducing in content of phenolic compounds، anthocyanins and flavonoids suggest reduction on oxidative damage.