Synchrotron X-ray fluorescence microscopy-enabled elemental mapping illuminates the 'battle for nutrients' between...

Area of Science:

• Plant pathology
• Plant physiology
• Biophysics

Background:

• Metal homeostasis is crucial for plant growth and development.
• Plant-pathogen interactions involve nutrient competition, affecting homeostasis.
• Limited understanding exists regarding metal distribution changes during plant-fungal disease.

Purpose of the Study:

• To assess X-ray fluorescence microscopy (XFM) for sub-micron nutrient mapping in plant tissues.
• To investigate the spatiotemporal effects of fungal infection on wheat leaf nutrient distribution.
• To analyze nutrient dynamics in wheat leaves infected with Pyrenophora tritici-repentis.

Main Methods:

• Utilized X-ray fluorescence microscopy (XFM) at the Australian Synchrotron.
• Analyzed hydrated, diseased wheat leaves in situ.
• Mapped essential mineral nutrients including K, Ca, Fe, Cu, Mn, and Zn.

Main Results:

• XFM successfully mapped nutrient distribution with sub-micron resolution.
• Significant hyperaccumulation and depletion of metals were observed in infected regions.
• Fungal mycelia were visualized via Cu and Zn distribution.
• Unexpected accumulation of Mn and Ca patterns were noted in relation to lesions and mycelia.

Conclusions:

• XFM is a powerful tool for high-resolution elemental mapping in diseased plant tissues.
• Fungal infection drastically alters nutrient distribution and metal homeostasis in wheat leaves.
• The study provides insights into host-pathogen nutrient competition and its impact on plant health.