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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements
Published on: July 13, 2016
Rhizophagy Cycle: An Oxidative Process in Plants for Nutrient Extraction from Symbiotic Microbes
James F White1, Kathryn L Kingsley2, Satish K Verma3
1Department of Plant Biology, Rutgers University, New Brunswick, NJ 08901, USA. jwhite3728@gmail.com.
The rhizophagy cycle describes how microbes transfer nutrients to plant roots. Microbes enter roots, are exposed to reactive oxygen, and release nutrients before re-entering the soil.
Area of Science:
- Plant-microbe interactions
- Root biology
- Nutrient cycling
Background:
- Symbiotic microbes associate with plant roots, but nutrient transfer mechanisms are not fully understood.
- The rhizophagy cycle is a newly described process involving microbial nutrient acquisition and host plant delivery.
Purpose of the Study:
- To describe the rhizophagy cycle mechanism for nutrient transfer from microbes to plant roots.
- To investigate the role of reactive oxygen in nutrient extraction from microbes within plant root cells.
Main Methods:
- Experiments were conducted on seed-vectored microbes and multiple host plant species.
- Microbial behavior and location within root tip meristem cells were observed.
- The role of NADPH oxidases (NOX) and reactive oxygen species (ROS) in nutrient extraction was examined.
Main Results:
- Microbes were observed to enter root tip meristem cells, residing in periplasmic spaces and converting to wall-less protoplast forms.
- Host-produced reactive oxygen (superoxide) from NADPH oxidases (NOX) degraded intracellular microbes, likely releasing nutrients.
- Surviving bacteria exited at root hair tips, re-emerging into the rhizosphere.
Conclusions:
- The rhizophagy cycle facilitates nutrient transfer from symbiotic microbes to host plants.
- Reactive oxygen plays a key role in extracting nutrients from microbes within root cells.
- Further research is needed to identify specific nutrients transferred and the overall importance of rhizophagy for plant nutrition.
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