稀土元素铈对芍药切花瓶插效果及生理特性的影响OA

In order to address the problem of short vase life and limited commercial value of cut peony flowers,two cultivars,'Red Charm'and'Sarah Bernhardt',were used as test materials.Three vase treatments were setup,as distilled water(M1),commercial preservative Chrysal(M2),and 30 μmol·L-1 cerium nitrate(M3).The regulatory effects of cerium on vase quality,water balance,membrane lipid peroxidation,antioxidant enzymes,the ascorbate-glutathione(ASA-GSH)cycle,and osmotic adjustment substances were systematically investigated.The results showed that 30 μmol·L-1 cerium nitrate can extend the vase life of cut flowers of the two varieties by 8 days and increased the fresh weight change rate of both cultivars,with values of 9.05％for'Red Charm'and 8.32％for'Sarah Bernhardt'on the 7th day,effectively delaying postharvest water deficit.After cerium nitrate treatment,the activities of SOD,POD,CAT,APX,GR and GPX in petals were all higher than those in the control treatments.Meanwhile,it maintained higher contents of reduced ascorbic acid(ASA)(1 094.86 μg·g-1 for'Sarah Bernhardt'and 1 442.61 μg·g-1 for'Red Charm')and reduced glutathione(GSH)(2.53 μmol·g-1 for'Sarah Bernhardt'and 1.99 μmol·g-1 for'Red Charm'),thereby enhancing the efficiency of the ASA-GSH cycle.It also inhibited the accumulation of malondialdehyde(MDA)(10.28 nmol·g-1 for'Sarah Bernhardt'and 62.78 nmol·g-1 for'Red Charm'),alleviating membrane lipid peroxidation damage.Furthermore,it promoted the accumulation of proline(287.76 μg·g-1 for'Sarah Bernhardt'and 341.26 μg·g-1 for'Red Charm')and soluble protein(6.66 mg·g-1 for'Sarah Bernhardt'and 6.82 mg·g-1 for'Red Charm'),enhancing cellular osmotic adjustment capacity.Obvious cultivar-specific responses were observed,that'Red Charm'showed stronger increases in CAT activity and ASA accumulation,while'Sarah Bernhardt'was more sensitive to cerium nitrate in terms of GSH synthesis.In summary,cerium nitrate alleviates oxidative stress and delays postharvest senescence of cut peony flowers through three complementary pathways-maintaining water balance,synergistically activating both enzymatic and ASA-GSH non-enzymatic antioxidant systems,and improving osmotic regulation and thus has potential as a novel environmentally friendly preservative for cut peony flowers.