Chitin and chitosan quantification in fungal cell wall via Raman spectroscopy

Area of Science:

• Mycology
• Plant-Fungal Interactions
• Biochemistry

Background:

• Fungal cell wall composition is crucial for understanding environmental interactions and host detection.
• Fungi like Pochonia chlamydosporia and Akanthomyces lecanii engage in endophytic relationships with plants.
• Knowledge of cell wall components is key to elucidating fungal interaction mechanisms.

Purpose of the Study:

• To quantify the relative amounts of chitin and chitosan in the cell walls of P. chlamydosporia and A. lecanii.
• To establish a baseline for cell wall composition in these agriculturally relevant fungal species.
• To explore the role of cell wall composition in fungal root colonization and host evasion.

Main Methods:

• Raman spectroscopy was employed for the first-time quantitative assessment of chitin and chitosan.
• Analysis included fungal isolates P. chlamydosporia (PC123) and A. lecanii (69NZ, 85SCT, 126KNY, 447SAF).
• Conventional quantification methods were combined with spectroscopy for comprehensive cell wall analysis.

Main Results:

• Significant variations in chitosan percentages were observed among the analyzed fungal isolates.
• Isolate 69NZ exhibited the highest chitosan content, followed by 85SCT, PC123, 447SAF, and 126KNY.
• Quantitative data on all cell wall components were obtained through the integrated methodological approach.

Conclusions:

• The study provides novel insights into the cell wall composition of P. chlamydosporia and A. lecanii.
• Results suggest that varying chitosan levels may contribute to fungal strategies for host evasion and immune resistance.
• Understanding these mechanisms can inform strategies for managing plant-fungal interactions in agriculture.