Reactive Oxygen Species, Antioxidant Responses and Implications from a Microbial Modulation Perspective

Area of Science:

• Plant Science
• Biochemistry
• Environmental Stress Biology

Background:

• Plants face environmental stresses that disrupt reactive oxygen species (ROS) homeostasis.
• Excessive ROS generation leads to oxidative stress and cellular damage.
• ROS act as signaling molecules but can be harmful at high levels.

Purpose of the Study:

• To review plant enzymatic and non-enzymatic antioxidant systems.
• To discuss ROS metabolism and its role in plant stress tolerance.
• To explore the microbiome's role in plant stress response.

Main Methods:

• Literature review of plant antioxidant machinery.
• Analysis of ROS signaling and oxidative stress mechanisms.
• Inclusion of microbiome-plant interactions in stress mitigation.

Main Results:

• Plants possess diverse enzymatic antioxidants (e.g., CAT, SOD, APX) and non-enzymatic molecules (e.g., ascorbate, glutathione, flavonoids).
• These systems scavenge excess ROS, maintaining redox balance crucial for survival.
• The plant microbiome can enhance tolerance to abiotic and biotic stresses.

Conclusions:

• Enzymatic and non-enzymatic antioxidants are vital for plant stress defense.
• Balancing ROS production and scavenging is key to plant health.
• Microbiome association offers a promising strategy for improving plant stress resilience.