摘要:
目的:研究库尔勒香梨采后贮藏期间黑头病发病与果实软化的相关性研究,为库尔勒香梨黑头病发病机制的进一步研究提供理论依据。方法:以接种黑头病致病菌的香梨果实为实验组(不接种黑头病致病菌的香梨为对照组),分别贮藏在普通冷库和气调冷库中。在贮藏的不同阶段分别测定不同贮藏条件下香梨果实中纤维素、果胶含量以及纤维素酶、果胶酶的活性,同时对与果实软化相关的基础理化指标进行测定。结果:与对照组相比,接种致病菌的果实软化程度更大,果实的硬度、可溶性固形物含量、果胶含量、粗纤维和木质素含量均明显低于对照组,与果实软化程度呈负相关;果实的多聚半乳糖醛酸酶和纤维素酶活性明显高于对照组,与果实软化呈正相关。两种贮藏条件相比,气调贮藏库中的果实各项理化指标均优于普通冷库贮藏,同时气调贮藏库中病果的发病明显滞后于普通冷库。结论:黑头病的发病加剧了库尔勒香梨果实的软化;气调贮藏果实发病速度较慢,更有利于果实的贮藏保鲜。
Abstract:
Objective:This experiment was aimed to discuss the correlation between blackhead disease and fruit softening during postharvest storage of Korla pear,so as to provide a theoretical basis for further research on the pathogenesis of blackhead disease in Korla pear. Methods:The fragrant pear fruit inoculated with the pathogen of blackhead disease was used as the experimental group(the healthy pear as the control group),and stored in the cold storage and the controlled atmosphere storage. At different storage stages,the contents of cellulose,pectin and cellulase and pectinase activities in pears under different storage conditions were determined,and the basic physical and chemical indexes related to fruit softening were determined. Results:Compared with the control group,the softening degree of the fruit inoculated with the pathogen was greater,and the firmness,soluble solids content,pectin content,crude fiber and lignin content of the pears were significantly low,in negative correlation to fruit softening;and the polygalacturonase and cellulase activity of the pears were significantly high,in positive correlation to fruit softening. Compared with the two storage conditions,the physical and chemical indexes of pears in the controlled atmosphere storage were better than those in cold storage. Meanwhile,the incidence of disease pear in controlled atmosphere storage lagged behind the cold storage. Conclusion:The disease of blackhead aggravates the softening of the Korla pears,and the rate of fruit onset was slow in the atmosphere storage and was more conducive to the storage and preservation of pears.
百度学术
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