Study On The Effect Of Controlled Atmosphere Storage On Fruit Storability And Quality In Different Persimmon Cultivars

In recent years,the persimmon industry in China has developed rapidly.However,there are still numbers of limitations in the post-harvest storage system of persimmons.The loss rate during the circulation is extremely high,which has seriously hindered the further development of the market.Controlled atmosphere storage,as a relatively advanced storage method for fruits,is rarely used in the postharvest storage of persimmons,and the gas composition suitable for controlled atmosphere storage of persimmons has not yet been clarified.This study aimed to investigate the difference in fruit quality of sweet(non-astringent)and astringent persimmons under low-oxygen conditions by controlled atmosphere storage experiments.To find a gas configuration suitable for the controlled atmosphere storage of different persimmon varieties.All is helpful to provide theoretical support for the establishment and improvement of the standards of controlled atmosphere storage and gas conditioning technology of persimmon,and to solve the technical problems of poor storability and decreased fruit quality during storage.The results show that,(1)Controlled atmosphere storage improved the storability and quality of persimmon.Treatments significantly delayed the decrease in the firmness and the increase in the total color difference of two cultivars of ’Jiro’ and ’Yangfeng’ and inhibited the increase of soluble sugar content and the decrease of titratable acid content to some extent.1%O2+1%CO2 treatment and 3%O2+3%CO2 treatment also effectively inhibited the decrease of ascorbic acid content and the increase of CAT activity and malondialdehyde maintained the fruit storage quality better.The 1%O2+3%CO2 treatment exacerbate the decrease of hardness and the increase of malondialdehyde content of sweet persimmon fruit.At the end of storage,the fruit completely softened,and some of them even appeared rotting and metamorphic,suggestting the treatment had no preservative effect(2)Controlled atmosphere storage had no distinct preservative effect on the storage and quality of astringent persimmon,and there was no significant difference in the changes of fruit hardness and sugar acid content between the treatments.The 1%O2+1%CO2 treatment inhibited the decrease of ascorbic acid content and the increase of malondialdehyde content of astringent persimmon,reduced the outbreak of CAT activity and maintained the storage quality of fruit.The 1%O2+3%CO2 treatment exacerbated the increase of decay rate and malondialdehyde reduced the storability of the fruit.(3)In controlled atmosphere storage,the sweet persimmon fruits had stronger storability than the astringent persimmon fruits.Sweet persimmon had better perception to hypoxia(1%),and the hardness of ’Jiro’ and ’Yangfeng’ fruits treated with 1%O2+1%CO2 and 3%O2+3%CO2 was significantly higher than that of CK.In contrast,astringent persimmons were less preservative to hypoxic conditions,and there was no significant difference in the firmness of astringent persimmon fruit between the controlled atmosphere treatment and CK.However,the malondialdehyde content and decay rate of 1%O2+3%CO2 treated sweet persimmon and astringent persimmon increased significantly,indicating that higher CO2 concentration may cause damage to persimmon fruit when the O2 concentration is low.In summary,the persimmon is a kind of fruit that can tolerate low oxygen environment.Sweet persimmon and astringent persimmon have different perception to hypoxia,and sweet persimmon fruit has higher storability in controlled atmosphere storage.1%O2+1%CO2 treatment can improve the storage quality of persimmon fruit.