不同采收期对南丰蜜橘贮藏品质及效果的影响

摘要

为确定适于南丰蜜橘贮藏的合理采收期，以南丰蜜橘为试材，在温度为（5±1）℃、相对湿度为85％～90％贮藏条件下，研究不同采收期对南丰蜜橘果实贮藏品质及效果的影响。结果表明：贮藏110 d后，采收期Ⅰ和采收期Ⅱ的果实腐烂率（分别为0％和11％）极显著低于采收期Ⅲ的果实（28％），但采收期Ⅰ的果实失重率极显著高于采收期Ⅱ、Ⅲ的果实，高达11．28％；在贮藏前期，采收期Ⅰ的果实可溶性固形物（ TSS）、总糖、维生素C （ Vc）含量偏低，可滴定酸（ TA）含量偏高；在贮藏后期，其TSS、总糖含量高于采收期Ⅱ、Ⅲ的果实；较早采收的果实（采收期Ⅰ、Ⅱ）丙二醛（MDA）积累较少，呼吸强度较低，多酚氧化酶（PPO）活性较低，且有效的延缓了果实Vc、TA含量的下降。综合各项生理生化指标，采收期Ⅱ的果实贮藏品质优于采收期Ⅰ、Ⅲ的果实，为较适宜的采收期。%In order to determine the reasonable harvest date for storage of Nanfeng mandarin , the fruits harvested on different dates were stored at (5±1)℃and RH 85%-90%,and the changes of fruit quality and storability were investigated .The results showed that the decay rates of the fruits of harvest ⅠandⅡ( 0%and 11%respectively) were significantly lower than that of harvest Ⅲ(28%) after 110 ds’storage,but the weight loss rate of the fruit of harvest Ⅰwas 11.28%,significantly higher than those of harvest ⅡandⅢ.At the early stage of storage,the fruit of harvest Ⅰhad lower total soluble solids (TSS),total sugar,Vitamin C (Vc) con-tent but higher titratable acidity ( TA) ,and higher TSS and TA at the later stage of storage than those of har-vest ⅡandⅢ.The fruits of harvest ⅠandⅡhad less MDA accumulation,lower respiration rate and PPO ac-tivity than those of harvest Ⅲ, thus effectively delayed the reduction of Vc content and TA .According to the physiological and biochemical indexes ,the storage quality of the fruit of harvest Ⅱwas better than those of har-vest Ⅰand Ⅲ,so harvest Ⅱwas ofthe most suitable harvest date for storage of Nanfeng mandarin .