: The previous treatments lead to a considerable delay in degradation of Chl a and Chl b compared to control (Table 4). The concentration of chlorophyll a was higher than chlorophyll b at any point of time throughout the vase life. When flowers were treated with AgNO3 30 ppm chlorophyll content on the 1st day was 0.672, 0.330 mg 1-1 weight for chl. a and chl. b, respectively (Table 4)