Role of Reactive Oxygen Species (ROS) in Non-host Resistance Against Phytopathogens
Hafez, Y., Abdelaal, K., Elbaghdady, N., Omar, A. (2011). Role of Reactive Oxygen Species (ROS) in Non-host Resistance Against Phytopathogens. EKB Journal Management System, 39(1), 53-59. doi: 10.21608/ejp.2011.158967
Yaser M. Hafez; Khaled A.A. Abdelaal; Nasr A.A. Elbaghdady; Ayman F. Omar. "Role of Reactive Oxygen Species (ROS) in Non-host Resistance Against Phytopathogens". EKB Journal Management System, 39, 1, 2011, 53-59. doi: 10.21608/ejp.2011.158967
Hafez, Y., Abdelaal, K., Elbaghdady, N., Omar, A. (2011). 'Role of Reactive Oxygen Species (ROS) in Non-host Resistance Against Phytopathogens', EKB Journal Management System, 39(1), pp. 53-59. doi: 10.21608/ejp.2011.158967
Hafez, Y., Abdelaal, K., Elbaghdady, N., Omar, A. Role of Reactive Oxygen Species (ROS) in Non-host Resistance Against Phytopathogens. EKB Journal Management System, 2011; 39(1): 53-59. doi: 10.21608/ejp.2011.158967

Role of Reactive Oxygen Species (ROS) in Non-host Resistance Against Phytopathogens

Egyptian Journal of Phytopathology
Article 4, Volume 39, Issue 1, 2011, Page 53-59  XML PDF (279.37 K)
Document Type: Original Article
DOI: 10.21608/ejp.2011.158967
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Authors
Yaser M. Hafez email orcid 1; Khaled A.A. Abdelaalorcid 1; Nasr A.A. Elbaghdady2; Ayman F. Omar1
1Excellence Center (EPCRS), Plant Pathology and Biotechnology Lab, Agricultural Botany Department, Faculty of Agriculture, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt.
2Genetics Department, Faculty of Agriculture, Kafrelsheikh University, 33516, Kafrelsheikh, Egypt.
Abstract
The majority of the plants in the natural conditions are resistant to most of the incompatible pathogens (viral, fungal and bacterial infections). This phenomenon is called ״non-host resistance״. This type of resistance is very important however, not enough research was conducted to explain the mechanism of this type of resistance.
When the authors inoculated several non-host plants with incompatible pathogens, levels of hydrogen peroxide (H2O2) and superoxide (O2.-) were increased and elevated early after inoculation. This phenomenon was found in tomato, datura, tobacco, cucumber, squash and Chenopodium which were inoculated with tobacco powdery mildew, Papaya ringspot virus (PRSV), cucumber powdery mildew, tobacco mosaic virus (TMV), tomato powdery mildew and PRSV, respectively.
Interestingly that, when some hosts from those mentioned above were inoculated, each with its compatible pathogen, no accumulation of H2O2 and O2.- was occurred.
The authors concluded that reactive oxygen species (ROS) mainly H2O2 and O2.- could have a key role in inhibiting or killing the pathogens early in the non-host plants. The authors recommend giving more attention to the application of H2O2 and O2.- either with direct application or with applying compounds which induce or produce ROS against phytopathogens.
Keywords
Cucumber; phytopargogens; non-host resistance; reactive oxygen; squash; tobacco; tomato
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