一氧化氮对猕猴桃果实营养品质和活性氧代谢的影响

分别用10、20和30μL.L-1一氧化氮(NO)气体熏蒸猕猴桃果实,研究NO对采后徐香猕猴桃(Actinidia chi-nensis Planch.cv.Xuxiang)的营养品质变化和活性氧代谢的影响。结果表明,20μL.L-1 NO处理后的猕猴桃果实含有较低的可溶性固形物和较高的可滴定酸、维生素C,且果实中丙二醛和超氧自由基质量分数低于其他体积分数的NO熏蒸处理(10和30μL.L-1 NO)。20μL.L-1 NO处理降低了猕猴桃果实中LOX活性,延缓了猕猴桃果实采后期间CAT活性的降低,显著提高了猕猴桃果实SOD和POD活性,且显著降低了猕猴桃果实中过氧化氢的质量分数。20μL.L-1 NO气体熏蒸保持了猕猴桃中较高的叶绿素、类胡萝卜素以及维生素E的质量分数。

Effect of nitric oxide on nutritional quality of kiwifruit and metabolism of reactive oxygen species

Fruits of Xuxiang kiwifruit cultivar(Actinidia chinensis Planch.cv.Xuxiang)were fumigatedwith10,20and30μL.L-1 of nitric oxide(NO)gas respectively.The correlative parameters with active oxygen metabolism were investigated.The result indicated that the treatment with 20 μL.L-1 NO gas maintained the lower soluble sugar content,the higher titratable acidity content and vitamin C content.But the contents of MDA and superoxide free radical in kiwifruit treated with 20 μL.L-1 NO gas were lower than those of the fruit treated with10 and 30 μL.L-1 NO gas.Fumigation with 20 μL.L-1 NO gas reduced LOX activity in kiwifruit,delayed the decrease of CAT activity during storage,significantly increased the activities of SOD and POD,and decreased the content of H2O2.And the contents of chlorophyll,carotenoid and vitamin E in kiwifruit were the lowest in the fruit treated with 20 μL.L-1 NO gas.