Phosphorus is an essential nutrient that often has low bioavailability in soils. Credit – Darcy McRose
The model plant Arabidopsis (shown here) makes secondary metabolites that may help solubilize phosphorus. Credit – Darcy McRose
Soil bacteria like Pseudomonas (pictured here) may be able to make plant metabolites more effective at phosphorus solubilization. Credit – Darcy McRose
The phosphorus-solubilizing metabolites made by Arabidopsis are also thought to be made by many food crops. Credit – Darcy McRose
- Assistant Professor
- Department of Civil and Environmental Engineering
Darcy McRose is an assistant professor in the Department of Civil and Environmental Engineering. She earned a bachelor’s degree in earth systems at Stanford and a PhD in geosciences at Princeton University. She completed postdoctoral training at Caltech where she was a biology and biological engineering divisional postdoctoral fellow, a Simons Foundation postdoctoral fellow, and a L’Oréal USA for Women in Science postdoctoral fellow. Her laboratory focuses on metabolites made by microorganisms and plants and draws on techniques from molecular biology, chemistry, and geosciences to study these molecules and their effects on soil fertility and plant growth.
Can plant metabolites and soil bacteria be harnessed to make phosphorus more bioavailable?
- Use laboratory experiments to determine whether a combination of plant metabolites and soil bacteria can be used to make mineral-associated phosphorus more bioavailable.
- Test the efficiency of phosphorus solubilization in natural and managed soils and develop tools to image exchanges of phosphorus between plants and microbes.
The nutrient phosphorus is essential for agricultural plant growth. When added as a fertilizer, phosphorus sticks to the surface of soil minerals, decreasing bioavailability and accumulating residual phosphorus. Heavily fertilized agricultural soils often harbor large reservoirs of this type of mineral-associated “legacy” phosphorus. Redox transformations are one chemical process that can liberate mineral-associated phosphorus. However, this needs to be carefully controlled as overly mobile phosphorus can lead to runoff and pollution of natural waters. Ideally, phosphorus would be made bioavailable when plants need it and immobile when they don’t.
Many plants make small metabolites that might be able to solubilize mineral-adsorbed phosphorus and be activated and inactivated under different conditions. McRose will use laboratory experiments to determine whether a combination of plant metabolites and soil bacteria can be used as a highly efficient and tunable system for phosphorus solubilization. She also aims to develop an imaging platform to investigate exchanges of phosphorus between plants and soil microbes. This work will embolden future research into the use of microbe-metabolite systems to solubilize phosphorus.
- Water Resources & Infrastructure
- Sustainability & Adaptation
- Soil Fertility & Crop Productivity
- Transforming Food Systems
- Seed Grant