紫外光(UV-C)处理对库尔勒香梨采后病斑扩展和抗病性的影响  

Effects of UV-C on Lesion Spread and Disease Resistance of Postharvest Fragrant Pear

作　　者：李学文[1] 廖亮[1] 黄玲[1] 叶强[1] 韩江[1] 

机构地区：[1]新疆农业大学食品科学学院,乌鲁木齐830052

出　　处：《新疆农业大学学报》2014年第2期159-163,共5页Journal of Xinjiang Agricultural University

基　　金：新疆维吾尔自治区科技支疆项目(201191144);"十二五"农村领域国家科技计划课题(2011BAD27B01)

摘　　要：以库尔勒香梨为材料,用紫外光(UV-C)照射处理,接种交链孢(Alternaria altetnata),研究UV-C处理对病斑扩展和香梨抗病性的影响。香梨采后用7.5kJ/m2的UV-C照射39min,处理24h后,接种交链孢(A.alternata),贮藏于低温条件下(-1℃,相对湿度95%),测定A.alternata病斑直径及果实抗性相关的酶活性。结果表明,UV-C处理可显著降低果实损伤接种A.alternata的发病率及病斑扩展直径(P<0.05),提高果实过氧化物酶(POD)、苯丙氨酸解氨酶(PAL)的活性,抑制几丁质酶(CHT)和β-1,3葡聚糖酶(GLU)活性的下降,显著提高果实总酚含量(P<0.05)。UV-C处理可提高香梨采后果实抗病相关酶的活性,抑制果实黑斑病的发展。Frangrant pear fruit （Pyresbretschnei deri Rehd）were used as test material to study the effect of ultraviolet-C （UV-C）light treatment on the spreading of postharvest disease spot and activities of dis-ease resisrance enzymes in postharvest fragrant pear fruit during cold storage.Fragrant pear fruits were ir-radiated with UV-C at 7.5 kJ/m2 for 39 min,and inoculated with Alternaria altetnata at 24 h after treat-ment,the diamiter of disease spot and the activities of enzymes related with the disease resistance of the fragrant pear fruit were determined.The result showed that UV-C treatment significantily decrease （P ＆lt;0.05）the lesion diameter and disease occurring related with inculation injure at cold storage and increase ac-tivities of the peroxidase （POD）and phenylalanine ammonia-lyase （PAL）,inhibit the decrease of chitinase （CHT）and glucanase （GLU）activities.Furthermor,UV-C enhanced the total phenol content.Conclusion showed that UV-C treatment can increase the activities of postharvest fragrant pear related with enzyme and can enhance lesion spreading.

关 键 词：库尔勒香梨 病斑 抗病性 

分 类 号：S661.2[农业科学—果树学]