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The antagonistic effect of hydroxyl radical on the development of a hypersensitive response in tobacco

文献类型： 外文期刊

作者： Deng, Sheng 1 ; Yu, Mina 1 ; Wang, Ying 1 ; Jia, Qin 1 ; Lin, Ling 3 ; Dong, Hansong 1 ;

作者机构： 1.Nanjing Agr Univ, Key Lab Monitoring & Management Crop Dis & Pest I, Minist Agricuture RP China, Dept Plant Pathol,Coll Plant Protect, Nanjing 210095, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjin

关键词： hydrogen peroxide: 7722-84-1;Fenton reagent;abscisic acid: 21293-29-8;riboflavin: 83-88-5;reactive oxygen species: ROS;7782-44-7;signaling molecule;hydroxyl radical: 3352-57-6;antagonistic effect;ParA1: elicitin protein;hypersensitive response

期刊名称：FEBS JOURNAL （ 影响因子：5.542； 五年影响因子：5.5 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Reactive oxygen species (ROS) are important signalling molecules in living cells. It is believed that ROS molecules are the main triggers of the hypersensitive response (HR) in plants. In the present study of the effect of riboflavin, which is excited to generate ROS in light, on the development of the HR induced by the elicitin protein ParA1 in tobacco (Nicotiana tabacum), we found that the extent of the ParA1-induced HR was diminished by hydroxyl radical (OH center dot), a type of ROS. As compared with the zones treated with ParA1 only, the HR symptom in the zones that were infiltrated with ParA1 plus riboflavin was significantly diminished when the treated plants were placed in the light. However, this did not occur when the plants were maintained in the dark. Trypan blue staining and the ion leakage measurements confirmed HR suppression in the light. Further experiments proved that HR suppression is attributed to the involvement of the photoexcited riboflavin, and that the suppression can be eliminated with the addition of hydrogen peroxide scavengers or OH center dot scavengers. Fenton reagent treatment and EPR measurements demonstrated that it is OH center dot rather than hydrogen peroxide that contributes to HR suppression. Accompanying the endogenous OH center dot formation, suppression of the ParA1-induced HR occurred in the tobacco leaves that had been treated with high-level abscisic acid, and that suppression was also removed by OH center dot scavengers. These results offer evidence that OH center dot, an understudied and little appreciated ROS, participates in and modulates biologically relevant signalling in plant cells.

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