NO Network for Plant-Microbe Communication Underground: A Review

Area of Science:

• Plant Biology
• Microbiology
• Soil Science

Background:

• The rhizosphere is a dynamic ecosystem where plants interact with diverse microbes, influencing plant health and productivity.
• Plant-microbe communication involves complex signaling networks, with nitric oxide (NO) emerging as a key signaling molecule.
• NO is implicated in various plant processes, including development, defense, and symbiotic interactions like legume-rhizobia symbiosis and mycorrhizal associations.

Purpose of the Study:

• To review and elucidate the multifaceted role of nitric oxide (NO) in mediating plant-microbe communication within the rhizosphere.
• To highlight NO's involvement in plant-microbe recognition, defense activation, and symbiotic development.
• To explore potential interactions between silicon and NO in regulating underground microbial communication and plant responses.

Main Methods:

• Literature review synthesizing current research on nitric oxide (NO) in plant-microbe interactions.
• Analysis of studies investigating NO's role in legume-rhizobia symbiosis, mycorrhizal associations, and PAMP/MAMP-triggered immunity.
• Examination of emerging evidence on silicon-NO interactions in the rhizosphere.

Main Results:

• Nitric oxide (NO) acts as a critical signaling molecule in plant-microbe interactions, facilitating both beneficial symbiotic relationships and defense responses against pathogens.
• NO is involved in key stages of symbiosis, including initial recognition, root hair curling, and nodule development.
• NO mediates the activation of plant defense cascades upon recognition of pathogen-associated molecular patterns (PAMPs) or microbe-associated molecular patterns (MAMPs).

Conclusions:

• Nitric oxide (NO) plays a pivotal role in underground plant-microbe communication, influencing plant health and productivity.
• Understanding NO's function is essential for developing strategies to enhance plant productivity and protect against phytopathogens.
• Further investigation into NO's precise mechanisms and its interaction with other factors like silicon is warranted.