INA抑制香蕉果实中活性氧积累和衰老进程提高果实的抗病性  

2,6-Dichloroisonicotianic acid repressed reactive oxygen species content and fruit ripening to induce disease tolerance in banana(Musa AAA. cv. Dongguang)

作　　者：张雪莲[1] 黄雪梅[2] 张灿[2] 张昭其[2] 庞学群[1] 

机构地区：[1]华南农业大学生命科学学院,广东广州510642 [2]广东省果蔬保鲜重点实验室/华南农业大学园艺学院,广东广州510642

出　　处：《广东农业科学》2016年第11期109-115,共7页Guangdong Agricultural Sciences

基　　金：国家"十二五"科技支撑计划项目(2015BAD16B07);国家自然科学基金(30771515)

摘　　要：探讨了香蕉贮藏期间INA处理对广东果实抗病性的影响及影响机制。结果表明:香蕉果实在INA处理后接种炭疽病菌孢子,贮藏15 d后,INA处理的果实病斑直径比对照果实明显减小,INA处理的MDA含量显著低于对照,表明INA处理能够延缓果实的衰老;INA处理果实的H2O2含量从贮藏8 d开始明显低于对照,而NADPH氧化酶活性则在贮藏10 d开始高于对照;在整个贮藏期间,INA处理的CAT活性均明显低于对照,抗坏血酸氧化酶活性则明显高于对照。在贮藏后期,INA促进APX基因的表达,却抑制了CAT和后熟相关基因P450的表达上调。说明在贮藏期间INA主要通过促进防御酶APX基因和酶活力抑制后期果实活性氧含量的增加,以诱导香蕉果实抗病性的增加。The possible mechanism of INA on disease-tolerance in postharvested banana （ Musa AAA. cv. Dongguang ） was investgated. Ther results showed that INA treatment effectively reduced the disease spot sizes on the peel of banana fruit when inoculated with spore suspension of Collectotrichum musae after INA treatment and cultured for 15 d. During storage, MDA content increased in both INA treatment and control; however, INA treatment markedly inhibited the MDA content, suggesting that INA retarded the fruit ripening. The content of H2O2 in INA treatment was obviously lower than that in control from the 8th d, while high activety of NADPH oxidase in INA treatment was found from the 10th d. An induced CAT activity was found in control during storage; however, high APX activity was detected in INA treatment. During the later storage, INA induced the APX gene expression, but repressed the expression of CAT and P450. The results suggested that enhancing APX activity/gene expression could reduce H2O2 level to improve banana disease tolerance during storage.

关 键 词：INA处理 抗病性 活性氧 APX P450 

分 类 号：S668.1[农业科学—果树学] S379[农业科学—园艺学]