The study of physiological and biochemical changes in cut rose cultivars during senescence

In the present study، the changes in physiological and biochemical attributes during flower senescence in petals of four different cut rose cultivars (Avalange، Yellow Island، Cool Water and Bakara) was investigated. Water uptake، fresh weight، flower diameter، protein content، lipid peroxidation and proline concentration were determined. There was a significant difference for vase life among investigated flowers، the highest vase life was found in Avalange cultivar with white petal color and the lowest one was found in Cool water with pink color. In all cultivars، fresh weight was the highest during bud stage and thereafter، that declined to senescence. The lowest water uptake was found in pink Cool water and the highest in white Avalange. Protein content was highest during bud stage and thereafter، decreased gradually during senescing of rose petal. Avalange with the longest vase life exhibited the highest protein content during different interval stages; Cool water had the lowest protein. Lipid peroxidation was increased with onset of senescence especially، but its level declined in senescence flower petals. Overall، increasing in lipid peroxidation and proline accumulation and declining protein content in petals may be resulted from oxidative stress.