Articles
PLANT HOST RESPONSE TO BIOCONTROL AGENTS
Article number
905_6
Pages
73 – 82
Language
English
Abstract
Application of microbial biocontrol agents to control postharvest diseases caused by fungal pathogens in various fruits has been considered to be a potential alternative to chemical fungicides.
The mechanisms of antagonists against fungal pathogens have been widely investigated in recent years.
Induction of host resistance has been considered to be an important action of microbial biocontrol agents against fungal pathogens.
Numerous reports indicated that some enzymes were related to defense response induced by antagonists.
As fungal pathogen infection can cause oxidative stress by inducing the generation of reactive oxygen species (ROS) in host plants, the oxidative stress has been shown to contribute to the damage of nucleic acids, lipids, and carbohydrates, and induce irreversible introduction of aldehyde and ketone (carbonyl) groups to amino acid sidechains, leading to protein inactivation and degradation and affecting the cellular functions.
Recently, we further investigated the effect of protein carbonylation in defense response of fruits treated by antagonistic yeasts to determine whether these yeasts were functional in alleviating pathogen-generated oxidative stress, and to further elucidate the mechanisms by which antagonistic yeast effectively control diseases of fruit.
The results of our experiments indicated that microbial biocontrol agents could reduce levels of proteins carbonylation in response to ROS caused by fungal pathogens.
Therefore, we consider that induction of antioxidant defense response may be an important mechanism of antagonistic yeast in mitigating pathogen-induced oxidative stress to postharvest fruit and controlling postharvest disease.
The mechanisms of antagonists against fungal pathogens have been widely investigated in recent years.
Induction of host resistance has been considered to be an important action of microbial biocontrol agents against fungal pathogens.
Numerous reports indicated that some enzymes were related to defense response induced by antagonists.
As fungal pathogen infection can cause oxidative stress by inducing the generation of reactive oxygen species (ROS) in host plants, the oxidative stress has been shown to contribute to the damage of nucleic acids, lipids, and carbohydrates, and induce irreversible introduction of aldehyde and ketone (carbonyl) groups to amino acid sidechains, leading to protein inactivation and degradation and affecting the cellular functions.
Recently, we further investigated the effect of protein carbonylation in defense response of fruits treated by antagonistic yeasts to determine whether these yeasts were functional in alleviating pathogen-generated oxidative stress, and to further elucidate the mechanisms by which antagonistic yeast effectively control diseases of fruit.
The results of our experiments indicated that microbial biocontrol agents could reduce levels of proteins carbonylation in response to ROS caused by fungal pathogens.
Therefore, we consider that induction of antioxidant defense response may be an important mechanism of antagonistic yeast in mitigating pathogen-induced oxidative stress to postharvest fruit and controlling postharvest disease.
Publication
Authors
Shiping Tian, Boqiang Li, Guozheng Qin, Xiangbin Xu
Keywords
fruit, biocontrol agent, defense response, ROS, oxygen damage
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