| Diaogan apricot is one of Xinjiang's specialty agricultural products.Due to its rich nutritional value and unique sensory quality,it has become a demanding product in Xinjiang fruit market in recent years.However,the Diaogan apricot has a short storage period and a rapid decline in quality,which greatly impairs the commerciality of the Diaogan apricot.At present,domestic research mostly focuses on the method of chemical treatment and storage of Diaogan apricots after harvesting,but there are few studies on ice-temperature storage.Ice-temperature storage can effectively prolong the storage time and quality of fruits and vegetables.Therefore,it is of great significance to study the ice-temperature storage technology of Diaogan apricot fruits.In this paper,fresh apricots were used as the main research object.By studying the storage quality,active oxygen metabolism and cell wall metabolism of Diaogan apricot fruits under ice-temperature storage conditions,the storage and preservation of Diaogan apricot fruits after harvesting were carried out for ice-temperature storage technology.The application provides a theoretical basis.The main contents and conclusions of this paper are as follows:1.The changes of storage quality,respiratory intensity and ethylene release of Diaogan apricot under different storage temperatures were studied and compared.The results showed that the decay rate and weight loss rate of Diaogan apricot fruits could be effectively reduced under ice-temperature storage,and the decline of fruit firmness,titratable acid and ascorbic acid content was significantly delayed.At the end of storage,the hardness of Diaogan apricot fruit stored at ice temperature was 1.4 kg/cm~2,the titratable acid content was 0.72%,and the ascorbic acid content was 9.2 mg/100g.Ice-temperature storage can effectively inhibit the respiratory intensity,delaying the peak of respiration by 10 days.Ice-temperature storage can delay the ethylene production of Diaogan apricot and effectively delay the aging process of apricot fruit during storage.2.The changes of reactive oxygen species(ROS)and ROS-related metabolic enzymes in Diaogan apricot under different storage temperatures were studied and compared.The results showed that ice-temperature storage could inhibit the increase of hydrogen peroxide content and superoxide anion formation rate during postharvest storage of Diaogan apricot,and could better maintain the activities of active oxygen scavenging enzymes such as catalase,peroxidase,superoxide dismutase and polyphenol oxidase.At the end of storage,the content of hydrogen peroxide and superoxide anion in Diaogan apricot fruits was 202.5 umol/g and 585.7 nmol/min.g.Therefore,ice-temperature storage can reduce the damage of active oxygen free radicals on fruit cells and delay the senescence of Diaogan apricot fruits.3.The effects of storage temperature on cell membrane integrity and cell wall pectin and cellulose of Diaogan apricot were studied.The results showed that ice-temperature storage could slow down the increase of cell membrane permeability and decrease the accumulation rate of malondialdehyde in Diaogan apricot fruits,which was beneficial to maintaining the integrity of cell membrane and prolonging the storage period of fruits.Ice-temperature storage can inhibit the increase of protopectin and cellulose content,reduce the activities of cell wall metabolic enzymes such as galacturonase and cellulase,and delay the softening of Diaogan apricot fruits.At the end of storage,the cell membrane permeability of Diaogan apricot fruits was 62.4%,MDA content was 1.94 nmol/g,original pectin content was 1.62%,cellulose content was 0.61%.Therefore,ice-temperature storage is an effective storage method to delay postharvest senescence and improve storage tolerance of apricot fruits. |
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