EI-Zahaby,, H. (2003). INFLUENCE OF SUPEROXIDE ANION AND HYDROGEN PEROXIDE IN THE HYPERSENSITIVE REACTION AND THE BACTERIAL MULTIPLICATION OF BEAN! Pseudomonas syringae pv. phaseoJico/a INTERACTION. Journal of Plant Production, 28(2), 893-905. doi: 10.21608/jpp.2003.242271
H. M. EI-Zahaby,. "INFLUENCE OF SUPEROXIDE ANION AND HYDROGEN PEROXIDE IN THE HYPERSENSITIVE REACTION AND THE BACTERIAL MULTIPLICATION OF BEAN! Pseudomonas syringae pv. phaseoJico/a INTERACTION". Journal of Plant Production, 28, 2, 2003, 893-905. doi: 10.21608/jpp.2003.242271
EI-Zahaby,, H. (2003). 'INFLUENCE OF SUPEROXIDE ANION AND HYDROGEN PEROXIDE IN THE HYPERSENSITIVE REACTION AND THE BACTERIAL MULTIPLICATION OF BEAN! Pseudomonas syringae pv. phaseoJico/a INTERACTION', Journal of Plant Production, 28(2), pp. 893-905. doi: 10.21608/jpp.2003.242271
EI-Zahaby,, H. INFLUENCE OF SUPEROXIDE ANION AND HYDROGEN PEROXIDE IN THE HYPERSENSITIVE REACTION AND THE BACTERIAL MULTIPLICATION OF BEAN! Pseudomonas syringae pv. phaseoJico/a INTERACTION. Journal of Plant Production, 2003; 28(2): 893-905. doi: 10.21608/jpp.2003.242271
INFLUENCE OF SUPEROXIDE ANION AND HYDROGEN PEROXIDE IN THE HYPERSENSITIVE REACTION AND THE BACTERIAL MULTIPLICATION OF BEAN! Pseudomonas syringae pv. phaseoJico/a INTERACTION
Agricultural Botany Department, Tanta Fac. of Agric., Tanta Univ., Egypt.
Abstract
The role of the oxidative burst. transient production of reactive oxygen species (ROS). such as superoxide anion (02'1 and hydrogen peroxide (H20Z). in elicitation of hypersensitive reaction (HR) was investigated in bean (Phaseoll)s vulgaris L. cv. Bronco) inoculated with compatible. wild type strain 0NT), or incompatible strain (TnS mutant) of Pseudomanas syringae pv. phas8olicola (Burkholder). Inoculation with the \NT strain caused water-soaked lesions. while Tn5 strain elidted HR necrosis started to appear 12 h post-inoculation.
Biochemical parameters, such as highly increase of the conductivity (el~rolyte leakage). which is a well-known indicator of permeability changes assOciated with HR, was found in the incompatible beanJbacleria (Tn5 strain) inleraction. The conductivity of this incompatible combination was early induced and markedly' increased, which recorded 1.5 & 6.25-limes higher than the control at 4 & 32 h post-inoculation, respectively. Also, lipid peroxidation, which is a well-known parameter of HR development, was mao<edty increased in the incompatible beanJbaderia interaction. It recorded, approximately, 3-times higher than the control treatment at 16. 20, & 24 h and almost 4-times at 32, 36 h post-inoculation.
It was a highly reduction in the growth rate of the Tn5 bacterial strain as compared to that in the compatible combination, \NT strain, in bean leaf tissues as a resun of superoxide anion and hydrogen peroxide generation. Multiplication of Tn5 strain slighUy increased by 1.3 and 0.5109, however \NT strain increased by 4.6 and 5.6 log at 24 and 48 h post-inoculation, respectively.
Either 02" or H,O, were highly significant generated in bean leaf tissues infittraled with the incompatible, Tn5 bacterial strain. as compared with both, tissues infiltrated with the compatible \NT strain or control, at all time detection. O{ level in tissue, infiltrated with Tn5 strain, reached 320 & 464% of the controltteatment at e & 24 h, respectively, post-infiltration. However, H20, level recorded 311 & 540% of the control values at 6 & 36 h, respectively post-infiltration.
These results suggest that an oxidative burst consisting of, at least, Of' and H202 occur during the hypersensitive defense response, and may be it is innuenced in HR necrotization. as well as counteracted the bacterial multiplication in bean leaf tissues.
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