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Bioimaging Techniques Reveal Foliar Phosphate Uptake Pathways and Leaf Phosphorus Status
Maja Arsic1,2, Stine Le Tougaard1, Daniel Pergament Persson1
1Department of Plant and Environmental Sciences, University of Copenhagen, 1871 Frederiksberg C, Denmark.
Plant Physiology
|June 17, 2020
Summary
Foliar phosphorus (P) fertilization boosts plant P use efficiency. New methods reveal P enters barley leaves via specific cell types, aiding nutrient uptake and food production.
Area of Science:
- Agricultural Science
- Plant Physiology
- Biochemistry
Background:
- Global demand for phosphorus necessitates sustainable agronomic practices for increased food production.
- Foliar phosphorus (P) fertilization is a potential strategy to enhance P use efficiency.
- Understanding leaf entry pathways for inorganic phosphate ion (Pi) uptake is crucial for optimizing foliar P application.
Purpose of the Study:
- To investigate leaf entry pathways for foliar inorganic phosphate ion (Pi) uptake in spring barley.
- To develop and validate techniques for tracing foliar P uptake and assessing P functionality.
- To determine the effectiveness of foliar P application in meeting plant nutrient demands.
Main Methods:
- Development of a whole-leaf P status assay using an IMAGING PAM system, with nonphotochemical quenching as a proxy for P status.
- Utilizing vanadate as a foliar Pi tracer combined with high-resolution laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) elemental mapping.
- Tracing Pi uptake pathways in P-deficient spring barley (Hordeum vulgare).
Main Results:
- The IMAGING PAM assay effectively monitored P functionality, showing restoration within 24 hours and indicating Pi remobilization over 7 days.
- LA-ICP-MS elemental mapping confirmed vanadate as a reliable Pi tracer, showing strong colocalization with P.
- Pi uptake was primarily observed via fiber cells above leaf veins, with potential facilitation by bundle sheath extensions, and minor stomatal/cuticular uptake.
Conclusions:
- Foliar P application can restore P functionality in deficient plants, with evidence of Pi remobilization to new growth.
- Vanadate serves as an effective tracer for studying foliar Pi uptake mechanisms.
- Identified leaf entry pathways provide insights into optimizing foliar P fertilization for improved crop nutrition and yield.
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