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2The Institute of Integrated & Honors Studies, Kurukshetra University, Kurukshetra – 136119, India
Comparative assessment was made between three chemicals viz. a metabolite (sucrose, 0.1M) a biocide (200 ppm of 8-hydroxyquinoline, 8-HQ) and a PGR (200 ppm of 5-sulfosalicylic acid, 5-SSA) regarding their performance to regulate petal senescence in cut scapes of three selected plants (Aster novae belgii, Matricaria parthenium and Gaillardia pulchella). These chemicals were used individually and also in combination of 8-HQ (200 ppm) + sucrose (0.1M) and 5-SSA (200 ppm) + sucrose (0.1M). Among these chemicals as holding solutions, individually sucrose was much more effective than 8-HQ and 5-SSA in minimizing the reduction in flower diameter and moisture loss. Sucrose was also more effective than 8-HQ and 5-SSA in reducing the protein loss by controlling protease activity. However, combined application of 8-HQ + sucrose yielded best result in controlling petal senescence followed by 5-SSA + sucrose in three selected plants. The holding solution having 8-HQ + sucrose could retain maximum protein and much lower protease activity in petals especially during 0 to 2-day stage than other stages in A. novae belgii and M. parthenium. Petals of G. pulchella recorded highest protease activity followed by M. parthenium and A. novae belgii.