脐橙挂树贮藏期间果实品质变化规律研究

Study on quality development of naval orange(Citrus sinensis Osb.)during storage of fruit kept on tree

从12月至次年4月期间,挂树贮藏的脐橙果实含酸量随时间进程明显降低,全程减少幅度高达37.5%。挂树贮藏不消耗果实糖份,果实可溶性固形物含量和糖含量保持稳定并略有上升。固酸比值和糖酸比值大幅提高。果实Vc含量、可食率和果汁率变化不大。挂树1个月后果实鲜食品质和风味的关键指标大幅上升,达到和超过了优质柑桔鲜果应具有的品质指标。含酸量的降低是导致糖酸比值和固酸比值升高、品质优化的最主要原因。试验表明脐橙挂树贮藏方式确能改善品质,适时采收可以提高鲜果的竞争力。

The quality change of ＇Roberson＇ navel orange fruit kept on tree during December to the next April was studied. The acid content of juice decreased significantly with the time and the decreased range was finally 37.5 %. The total soluble solids（TSS） and sugar content of juice increased slightly,and the ratio of TSS/acid and sugar/acid increased greatly. Few change was observed with Vitamin C content, percentage of edible parts and percentage of juice during the whole period. After one month kept fruits on tree since mid-December, the fruit taste and the key quality factors were improved markedly, and reached or exceeded the indexes of high-quality fresh fruits. The chief reason for sugar/acid and TSS/acid increasing as well as fruit taste improving was the large-ranged decrease of acid content. The experimental result showed that the storage method by keeping fruit on tree for months can really improve the fruit quality of navel orange, and the ability of market competition for fresh fruits can also enhance when harvested at a proper time.