采前喷施糖醇螯合钙对猕猴桃贮藏品质的影响

Effect of Spraying Sugar Alcohol Chelated Calcium before Harvest on Storage Quality of Kiwifruit

目的:采前喷施糖醇螯合钙提高采后猕猴桃贮藏及货架期的品质。方法:以‘红阳’和‘hort-16A’2个品种猕猴桃为试材,幼果期至成熟期喷施1.0%糖醇螯合钙,采后果实0 ℃冷藏120 d结合25 ℃货架期12 d,测定果实营养品质及生理生化指标变化。结果:与对照相比,采前喷施糖醇螯合钙可以有效提高猕猴桃果实中的钙离子含量,抑制猕猴桃腐烂率、丙二醛含量、呼吸强度和脂氧合酶活性的上升,减缓硬度、Vc、可溶性固形物及可滴定酸含量的下降。结果还表明,采前喷施糖醇螯合钙能够较好地维持‘红阳’和‘hort-16A’猕猴桃贮藏期间过氧化物酶和超氧化物歧化酶的活性,降低活性氧的积累,延缓猕猴桃的衰老。结论:采前喷施糖醇螯合钙可以有效提高‘红阳’和‘hort-16A’猕猴桃果实贮藏效果。

Objective:The quality of postharvest kiwi fruit during storage and shelf life was improved by spraying sugar alcohol chelated calcium before harvest.Methods:Two cultivars ‘Hongyang’ and ‘hort-16A’ kiwifruits were used as materials,1.0% sugar alcohol chelated calcium was sprayed from young fruit period to maturity,postharvest fruits were refrigerated at 0 ℃ for 120 d and shelved at 25 ℃ for 12 d,the changes of nutritional quality and physiological and biochemical indexes were measured.Result:The results showed that the calcium content of both kinds of kiwifruits was increased with the spraying sugar alcohol chelated calcium compared with the control.The increase of decay incidence,malondialdehyde content,respiratory rate and the activity of lipoxygenase in the kiwifruits of two cultivars were inhibited,while the reduction of hardness,Vc content,total soluble solids and titratable acid were slowed down.The results also indicated that preharvest organic calcium spraying can maintain the activities of peroxidase and superoxide dismutase,reduce the accumulation of reactive oxygen,and delay the aging of kiwifruit.Conclusion:Spraying of sugar alcohol chelated calcium before harvest could effectively improve the storage effect of ‘Hongyang’ and ‘hort-16A’ kiwifruits.