Extracellular vesicles from extreme microbes for agricultural applications

Overview

This research explores the agricultural potential of microbes that thrive in extreme environments by studying the extracellular vesicles (EVs) they naturally release. These EVs carry bioactive compounds that can influence plant health, soil fertility, and pathogen resistance. By isolating EVs directly from environmental samples, this approach bypasses the challenge of culturing extremophilic microbes in the lab, making it possible to harness their biological functions for agricultural benefit.

The platform addresses key agricultural needs including improved soil fertility, enhanced plant tolerance to pests and pathogens, and increased crop output, all through environmentally acceptable biological mechanisms. EVs from extreme environments represent an untapped resource of bioactive molecules with potential applications in crop protection and production.

Technical specifications

Core approach:

• Isolation of extracellular vesicles from extremophilic microbes collected from extreme environments, including samples obtained through the South African National Antarctic Programme
• Standard EV isolation methods adapted from biofluid research (such as those used for urine and blood)
• Direct in vitro testing of EV bioactivity in relevant agricultural hosts, including fungal pathogens of maize and maize kernels

Key capabilities demonstrated:

• Successful EV extraction from various sources including fungi and plants
• Evidence that microbes absorb EVs and exhibit phenotypic changes, such as reduced hyphal formation in fungi
• Ability to study microbial functionality without maintaining live extremophilic cultures

Research workflow:

• Sample collection from extreme environments
• Isolation and characterization of extracellular vesicles
• Bioactivity testing across a range of hosts including plants and their microbial pathogens

Technology readiness level

This research is at an early-to-mid stage of development. The team has already demonstrated the ability to extract EVs from multiple biological sources and has conducted uptake studies showing that EVs can produce measurable phenotypic effects in recipient microbes. Current work involves an active field collection expedition through the South African National Antarctic Programme to gather samples from extreme environments.

The next validation phases include isolating and characterizing EVs from collected extreme-environment samples (projected June–August 2022), followed by systematic bioactivity testing in plant hosts and microbial pathogens (projected September–December 2022). The platform is positioned for collaborative development with partners interested in sustainable agricultural solutions and novel bioactive compound discovery.