A next-generation marker genotyping platform (AmpSeq) in heterozygous crops: a case study for marker-assisted selection in grapevine
Shanshan Yang , Jonathan Fresnedo-Ramírez , Minghui Wang , Linda Cote , Peter Schweitzer , Paola Barba , Elizabeth M Takacs , Matthew Clark , James Luby , David C Manns , Gavin Sacks , Anna Katharine Mansfield , Jason Londo , Anne Fennell , David Gadoury , Bruce Reisch , Lance Cadle-Davidson , Qi Sun
Horticulture Research ›› 2016, Vol. 3 ›› Issue (1) : 16002
Marker-assisted selection (MAS) is often employed in crop breeding programs to accelerate and enhance cultivar development, via selection during the juvenile phase and parental selection prior to crossing. Next-generation sequencing and its derivative technologies have been used for genome-wide molecular marker discovery. To bridge the gap between marker development and MAS implementation, this study developed a novel practical strategy with a semi-automated pipeline that incorporates trait-associated single nucleotide polymorphism marker discovery, low-cost genotyping through amplicon sequencing (AmpSeq) and decision making. The results document the development of a MAS package derived from genotyping-by-sequencing using three traits (flower sex, disease resistance and acylated anthocyanins) in grapevine breeding. The vast majority of sequence reads (⩾99%) were from the targeted regions. Across 380 individuals and up to 31 amplicons sequenced in each lane of MiSeq data, most amplicons (83 to 87%) had <10% missing data, and read depth had a median of 220–244×. Several strengths of the AmpSeq platform that make this approach of broad interest in diverse crop species include accuracy, flexibility, speed, high-throughput, low-cost and easily automated analysis.
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