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Rapid microsatellite development for tree peony and its implications.
Zhimin Gao1, Jie Wu, Zheng'an Liu
1Beijing Botanical Garden, Key Laboratory of Plant Resources, Institute of Botany, The Chinese Academy of Sciences, Beijing 100093, PR China. gaozhimin@icbr.ac.cn.
BMC Genomics
|December 18, 2013
Summary
This study developed numerous simple sequence repeat (SSR) markers for tree peony using next-generation sequencing. These SSR markers are valuable for genetic studies and breeding in tree peony and related species.
Area of Science:
- Genomics
- Plant Science
- Molecular Biology
Background:
- Microsatellites, or simple sequence repeats (SSRs), are increasingly recognized for their functional roles in genome evolution and physiological processes.
- Next-generation sequencing (NGS) facilitates large-scale SSR discovery, particularly in species lacking reference genomes.
Purpose of the Study:
- To develop a substantial set of SSR markers for tree peony (Paeonia suffruticosa) using high-throughput sequencing.
- To characterize the identified SSRs and assess their utility in genetic analyses.
Main Methods:
- Enriched DNA libraries of tree peony were subjected to 454 GS-FLX Titanium pyrosequencing.
- Bioinformatic analysis was performed to identify and characterize SSRs, including motif type, length, and location within coding domain sequences (CDS).
- Primer pairs were designed, validated, and tested for polymorphism across different genotypes.
Main Results:
- Over 237,000 SSRs were identified from approximately 675,000 reads.
- Di-nucleotide repeats were the most abundant type, with (A/T)n motifs predominating.
- A significant proportion of SSRs were located in CDS regions, and 24 validated primer pairs showed polymorphism among genotypes, confirming their utility.
Conclusions:
- The large-scale development of SSR markers provides valuable resources for tree peony genomics, including genetic map construction, QTL mapping, and marker-assisted breeding.
- These SSRs will aid in understanding genomic structural evolution and phenotypic variation in tree peony and related species.
