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NbRbohB基因在本氏烟与疫霉菌互作中的功能分析

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Keywords: 活性氧,NADPH氧化酶,NbRbohB,病毒诱导的基因沉默,植物抗病性

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Abstract:

活性氧(activeoxygenspecies,AOS)在植物抗病中发挥着重要作用,主要由NADPH氧化酶(nicotinamideadeninedinucleotidephosphateoxidase)系统产生.为明确NADPH氧化酶NbRbohB基因在本氏烟与疫霉菌亲和与非亲和性互作中的功能,采用荧光定量PCR技术以及病毒诱导的基因沉默方法探究了NbRbohB基因在本氏烟中对2种疫霉菌抗性中的作用,并利用NADPH氧化酶抑制剂对辣椒疫霉的抗性进行了检测.结果发现:2种疫霉菌均能诱导本氏烟发生氧迸发,且NbRbohB基因可能参与了疫霉菌诱导本氏烟发生的氧迸发过程.该基因沉默后降低了本氏烟对亲和互作辣椒疫霉菌的抗性,但对非亲和互作疫霉菌的抗性没有肉眼可见的影响;NADPH氧化酶抑制剂处理本氏烟后也能降低其对辣椒疫霉的抗性.表明该基因通过介导AOS产生,参与植物对亲和性与非亲和性互作疫霉的抗病反应,在亲和互作中尤为重要.

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