Development of Novel Polymorphic EST-SSR Markers from the Cranberry Fruit Transcriptome

Area of Science:

• Plant genetics
• Molecular breeding
• Horticultural science

Background:

• Cranberry (Vaccinium macrocarpon) exhibits significant research potential but faces challenges due to a narrow genetic base and slow breeding progress.
• Limited morphological distinctiveness and traditional breeding limitations hinder cultivar development.

Purpose of the Study:

• To assess polymorphic EST-SSR markers derived from cranberry fruit transcriptomic data.
• To identify candidate EST-SSR sequences for advancing stress resistance breeding in cranberries.

Main Methods:

• EST-SSR marker analysis was performed on 13 cranberry accessions.
• Primer transferability was tested across 16 other Vaccinium species.
• Genomic DNA was extracted, amplified via PCR, and analyzed using NTSYS-pc for genetic similarity and clustering.

Main Results:

• Seven polymorphic EST-SSR primer pairs were identified from 47 designed pairs.
• Average expected heterozygosity was 0.455, with an average effective allele number of 1.844.
• UPGMA clustering revealed four distinct groups among the 13 cranberry accessions based on genetic similarity.

Conclusions:

• The seven polymorphic EST-SSR markers effectively revealed genetic relationships among cranberry accessions.
• These markers provide a valuable tool for future research in cranberry stress resistance breeding.