Methods for the study of leaf anatomy in palms

Area of Science:

• Botany
• Plant Anatomy
• Microscopy

Background:

• Palm leaves present significant challenges for anatomical study due to their large size, hardness, and the presence of diverse cell types (fibers, sclereids, parenchyma).
• The complex composition, including silica, calcium oxalate, and tannins, further complicates preparation methods.

Purpose of the Study:

• To establish effective protocols for the anatomical preparation of palm leaves for microscopic observation.
• To provide detailed methods for obtaining high-quality sections and macerations for various microscopy techniques.

Main Methods:

• Samples are fixed in formol-acetic-alcohol (FAA) and stored in glycerin alcohol. Techniques include microtomy (15-micron sections), epidermal macerations, clearing, and scanning electron microscopy (SEM).
• Specific protocols involve hydrofluoric acid treatment for microtomy, critical point drying with CO2 for SEM, and bleach treatment for epidermal peels.
• Clearing of transverse veins uses sodium hydroxide and commercial bleach.

Main Results:

• Successful preparation of transverse and longitudinal sections, epidermal peels, and material for SEM was achieved.
• Optimized fixation and storage methods minimize hardening, facilitating sectioning.
• Detailed procedures allow for clear observation of anatomical features, including transverse veins.

Conclusions:

• The described methods overcome the difficulties associated with palm leaf anatomy preparation.
• These protocols enable detailed anatomical studies of palm leaves using various microscopy techniques.
• The methods are adaptable for reproductive material, with adjustments for specimen size.