Optimizing TILLING and Ecotilling techniques for potato (Solanum tuberosum L)

Area of Science:

• Plant genetics
• Molecular biology
• Agricultural science

Background:

• Potato (Solanum tuberosum) cultivars were subjected to gamma irradiation.
• Mutant potato cultivars exhibited enhanced salinity tolerance, crucial for regions like Syria facing soil salinization.
• Salinity tolerance is a vital agricultural trait in potato production.

Purpose of the Study:

• To apply TILLING and Ecotilling techniques for nucleotide polymorphism discovery in potato.
• To optimize enzymatic mismatch cleavage and fluorescence DNA detection for polymorphism screening.
• To assess the utility of these methods for rapid germplasm characterization and mutation discovery.

Main Methods:

• Development of gene-specific primer pairs from BAC sequences for target gene amplification (1-1.5 kb).
• Optimization of enzymatic mismatch cleavage and fluorescence-based DNA detection.
• Application of TILLING (Targeting Induced Local Lesions IN Genomes) and Ecotilling for polymorphism discovery.

Main Results:

• One primer pair successfully amplified a single gene target.
• Identified 15 putative nucleotide polymorphisms per kilobase.
• Discovered nine unique polymorphisms across the three tetraploid potato cultivars.

Conclusions:

• Enzymatic mismatch cleavage is effective for TILLING and Ecotilling in diverse potato varieties.
• This approach enables rapid germplasm characterization, bypassing expensive DNA sequencing.
• The method is suitable for high-throughput mutation discovery in reverse genetic screens.