Oligo-FISH Paints in Triticeae.

Area of Science:

• Plant genetics and genomics
• Molecular cytogenetics
• Bioinformatics

Background:

• Accurate karyotyping is crucial for understanding plant genome evolution and diversity.
• Traditional FISH methods can be limited in resolution and throughput for complex genomes like those in the Triticeae tribe.
• Oligonucleotide probes offer potential for higher specificity and efficiency in cytogenetic analyses.

Purpose of the Study:

• To develop and validate oligonucleotide (oligo) pools for chromosomal Oligo-FISH painting.
• To apply the developed probes for high-throughput karyotyping of barley (Hordeum vulgare L.) and wheat (Triticum aestivum) chromosomes.
• To facilitate chromosome identification and evolutionary analysis within the Triticeae tribe, including species with nonsequenced genomes.

Main Methods:

• Development of seven oligo pools targeting single-copy sequences on chromosomes 1–7 of barley and wheat.
• Application of Oligo-FISH painting for high-throughput karyotyping across over 350 species in the Triticeae tribe.
• Integration with nondenaturing FISH (ND-FISH) using tandem-repeat oligos for enhanced chromosome identification.

Main Results:

• Successful development of oligo pools for specific chromosomal targeting in barley and wheat.
• Demonstrated high-throughput karyotyping capability for a wide range of Triticeae species, including wild relatives and alien-derived lines.
• Established a robust Oligo-FISH painting technique for identifying individual chromosomes and homologous linkage groups.

Conclusions:

• The developed Oligo-FISH painting technique is an efficient tool for standard karyotype establishment in the Triticeae tribe.
• This method is particularly valuable for chromosome evolutionary analysis of wild Triticeae species with unsequenced genomes.
• The combination of oligo probes and ND-FISH provides a powerful approach for plant cytogenetics.