Study On Fresh-keeping And Senescence Mechanism Of Cut Gerbera Flower

Non-ethylene-sensitivity flower, (Gerberajamesonii Bolus) 'Emperor' and 'Mazurka' were held respectively in different solutions, which included single plant growth regulators and preservatives containing plant growth regulators, and water was taken as control. Effects of such solutions on senescence of cut gerbera flower were systematically studied. On the bases of vase life survey, effects of active oxygen and other factors on senescence of cut gerbera were investigated by means of measuring water balance, change rate of fresh weight, the activities of SOD, CAT and POD, the production rate of superoxide radical, the content of malonyldiadehyde, proline, soluble protein and sugar. Moreover, effects of preservatives containing scavengers of active oxygen on ornamental qualities in cut gerbera were discussed. The main results were shown as follows:1. Different categories and different concentrations of plant growth regulators had effect on vase life of cut gerbera. Comparing with CK, the vase life of cut gerber was no difference by 6-BA and PP333 , was distinctly prolonged by CCC(P<0.05), was more prominently prolonged by B9 (P<0.01), on the contrary, was more drastically shortened by GA(P<0.01). The effects of 500ul/L CCC and 50mg/L B9 were the best among all treatments and could be used to the further study of preservatives.2. On the foundation of basic preservative (3% S + 200mg/L 8-HQC) , preservatives including respectively 500ul/L CCC and 50mg/L B9were selected as above. The results were found that preservatives which joined CCC or B9 to basic preservative could effectively increase activities of SOD, CAT and POD, decrease content of malonyldiadehyde, proline and the production rate of superoxide radical, enhance the content of soluble protein and sugar, enlarge fresh weight and improve water balance of cut flower. The vase life was prolonged through reducing the harm of active oxygen and scarce of water on cut gerbera.3. The treatments were the preservatives which added scavengers of activeoxygen (salicylic acid, benzoic acid, ascorbic acid) into basic preservative. It could be found that all of preservatives could prolong vase life of cut gerbera flower. Among them, preservatives A2(3% S+200mg/L 8-HQC+30mg/L salicylic acid) and Cl(3% S+200mg/L 8-HQC+100mg/L benzoic acid) were the best treatments, which prolonged respectively 12 days and 9.5 days and improved fresh weight and water balance of cut gerbera.4. On the basis of researching senescence mechanism of cut gerbera flower. The thesis has made further discussion on senescence mechanism of non-ethylene-sensitivity flower.