摘要
采后柑桔Gitrus reticulata Var.tankan果实经钙减压浸渍处理,提高了果实中的钙含量,使果实损耗率明显降低,糖酸比值高峰出现时间推迟,从而延缓了衰老。经钙处理后果肉中的可溶性蛋白质含量有所降低,但果实呼吸速率变化不大。同时,钙处理使果实纤维素酶活性降低并一直维持在较低水平,果胶甲酯酶和多聚半乳糖醛酸酶活性也受到明显抑制。用钙抑制剂EGTA处理,会使果实中钙含量降低,果实衰老加快;纤维素酶,果胶甲酯酶和多聚半乳糖醛酶的活性显著增加。
Calcium treatment of the postharvested citrus fruit (Citrus reticulata var. tankan)in-creased the calcium content within the fruit. The loss rate was reduced and the time when the sugar/acids ratio reaches their maximum was delayed as well. Calcium treatment prolonged their shelf life and improved the storage quality, while the soluble protein declined, the respiratory rate showed only a little change. On the other hand,the activity of cellulase was decreased to a stable low level. When treated with EGTA,a chelate of calcium,the citrus fruit showed a decline in their soluble calcium content and became senescence rapidly. In addition,the activities of cellulase, pec-tinisterase and polygalacturonase in the EGTA-treated fruit increased significantly. It was suggested that the delay of senescence of citrus fruits by calcium was related directly to the alteration of cellulase and pectolases activities.
基金
国家自然科学基金
关键词
钙
纤维素酶
果胶酶
柑桔类果树
calciumi cellulase
pectolase
senescence
citrus ftuits
