A Fast Air-dry Dropping Chromosome Preparation Method Suitable for FISH in Plants

Area of Science:

• Plant Cytogenetics
• Molecular Biology

Background:

• High-quality chromosome spreads are crucial for fluorescence in situ hybridization (FISH).
• Preparing plant chromosome spreads is challenging due to rigid cell walls.
• Existing methods like drop preparation can be time-consuming and complex.

Purpose of the Study:

• To develop a fast, efficient, and reproducible protocol for preparing mitotic chromosome spreads from plants.
• To optimize chromosome spread preparation for enhanced fluorescence in situ hybridization (FISH) detection of DNA probes.

Main Methods:

• An improved air-dry drop method was developed, maintaining a relative humidity of 50%-55%.
• The protocol features a reduced number of washing steps for simplicity and efficiency.
• The method was tested on various Hordeum species and Secale cereale.

Main Results:

• The optimized protocol produces well-spread, undamaged metaphase chromosomes.
• High-quality chromosome spreads suitable for FISH analysis were consistently obtained.
• Reproducible FISH results were achieved using the prepared chromosome spreads.

Conclusions:

• This improved drop-preparation method offers a fast and reliable technique for plant chromosome spread preparation.
• The protocol facilitates successful FISH analysis, particularly for detecting single and high-copy DNA probes.
• The method is applicable to diverse plant species, including Hordeum and Secale.