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首页> 外文期刊>Journal of Experimental Botany >Production of reactive oxygen species in Arabidopsis thaliana cell suspension cultures in response to an elicitor from Fusarium oxysporum: implications for basal resistance
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Production of reactive oxygen species in Arabidopsis thaliana cell suspension cultures in response to an elicitor from Fusarium oxysporum: implications for basal resistance

机译:响应于尖孢镰刀菌引起的拟南芥细胞悬液培养物中活性氧的产生:对基础抗性的影响

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摘要

The present understanding of ROS generation in the defence response of Arabidopsis thaliana is reviewed. Evidence suggests that the apoplastic oxidative burst generated during basal resistance is peroxidase-dependent. The ROS generated during this basal resistance may serve to activate NADPH oxidase during the R-gene-mediated hypersensitive response. The processes involved in the production of reactive oxygen species in A. thaliana cell suspension cultures in response to an elicitor from Fusarium oxysporum are investigated in the present work. This system appears analogous to the production of ROS during the basal resistance response in French bean, which is peroxidase-dependent. A panel of modulators effective in other pathogen elicitor and plant cell systems has been used to investigate the Arabidopsis signalling pathways and the plant cell responses involved. Thus as in other systems, an early calcium influx into the cytosolic compartment, a rapid efflux of K+ and Cl−, and extracellular alkalinization of elicited cell cultures has been found. However the alkalinization is not sufficient to stimulate the apoplastic oxidative burst by itself, unlike in French bean, although vectorial ion fluxes are needed. A secretory component which is sensitive to monensin and N-ethylmaleimide and insensitive to brefeldin A may also be necessary for the release and provision of substrates for peroxidase-dependent generation of H2O2.
机译:综述了目前对拟南芥防御反应中ROS产生的理解。有证据表明,在基础抗性过程中产生的质外性氧化爆发是过氧化物酶依赖性的。在这种基础抗性过程中产生的ROS可能在R基因介导的超敏反应过程中激活NADPH氧化酶。在本工作中,研究了拟南芥细胞悬浮培养物中响应于尖孢镰刀菌引起的活性氧产生过程。该系统似乎类似于法国豆基础抗性反应期间ROS的产生,这是过氧化物酶依赖性的。在其他病原体激发物和植物细胞系统中有效的一组调节剂已用于研究拟南芥信号传导途径和涉及的植物细胞应答。因此,如同在其他系统中一样,已经发现钙早期流入胞质区室,K + 和Cl -的快速流出,以及引起的细胞培养物的胞外碱化。然而,尽管需要向量离子通量,但与法国蚕豆不同,碱化不足以单独刺激引发质外性氧化破裂。对莫能菌素和N-乙基马来酰亚胺敏感而对布雷菲德菌素A不敏感的分泌成分对于释放和提供过氧化物酶依赖的H 2 O 2 生成底物也可能是必需的。子>。

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