Phototrophic bacteria as potential probiotics for corals

Area of Science:

• Marine microbiology
• Coral reef ecology
• Symbiotic relationships

Background:

• Coral-associated microorganisms are vital for host health, providing nutritional, protective, and developmental support.
• The functional traits of many coral symbionts, particularly phototrophic bacteria, remain largely unexplored.
• Understanding these microbial roles is critical for coral reef conservation.

Purpose of the Study:

• To review the functional traits and potential benefits of phototrophic bacteria in coral holobionts.
• To explore the capacity of phototrophic bacteria to enhance coral nutrition and resilience to environmental stressors.
• To highlight the understudied role of these bacteria in coral energy budgets and heat stress tolerance.

Main Methods:

• Literature review and synthesis of existing research on coral-associated phototrophic bacteria.
• Analysis of proposed mechanisms for nutritional enhancement (e.g., photosynthesis) and stress mitigation (e.g., antioxidant production).
• Identification of knowledge gaps regarding the contribution of phototrophic bacteria to coral holobiont physiology.

Main Results:

• Phototrophic bacteria possess traits like photosynthesis and antioxidant production that can benefit coral hosts.
• These bacteria may contribute to coral nutrition and mitigate oxidative stress, particularly during bleaching events.
• Their specific impact on the holobiont's energy budget and heat stress resilience requires further investigation.

Conclusions:

• Phototrophic bacteria represent a promising, yet understudied, component of the coral holobiont.
• Harnessing their functional traits could be key to enhancing coral health and resilience in a changing climate.
• Future research should focus on quantifying their contributions to coral physiology and stress tolerance.