减压处理对新疆白杏果实软化和细胞壁代谢的影响

Effects of hypobaric storage on softening and cell wall metabolism of Xinjiang kuqa apricot fruits

为了探讨减压贮藏对新疆白杏的保鲜效果,以新疆白杏果实为试料,研究了0℃贮藏条件下减压处理对白杏果实成熟软化和细胞壁代谢的影响。结果表明:减压处理不仅抑制了白杏果实呼吸作用和乙烯释放量的上升,还抑制了果实多聚半乳糖醛酸酶(PG)、果胶甲酯酶(PE)和纤维素酶活性的增加,从而延缓了原果胶和纤维素的降解以及水溶性果胶含量的增加,较好地保持了果实的硬度,延缓果实的软化进程,延长贮藏期。其中,50kPa压力处理效果较好。研究结果为减压贮藏对新疆白杏果实贮藏作用机理的研究提供了依据。

In order to explore the effectiveness of hypobaric storage on postharvest of kuqa apricot fruits, the effects of hypobaric storage on softening and cell wall metabolism of Xingjiang kuqa apricot were investigated. The results showed the ethylene production and respiratory rates of kuqa apricot with hypobaric storage were significantly reduced; and the activities of polygalacturonase （PG） and pectin methylesterase （PME）, and ceUulase enzymes were significantly retarded during storage at 0~C. So the hydrolysis of protopectin and cellulose were decreased. This study suggested that 50 kPa of the hypobaric storage was the best in maintaining fruit firmness and extending the postharvest life of kuqa apricot fruits. The research provides a basis for hypobaric storage mechanism of Xingjiang kuqa apricot fruits.