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Published on: January 9, 2018
The reference genetic linkage map for the multinational Brassica rapa genome sequencing project
Su Ryun Choi1, Graham R Teakle, Prikshit Plaha
1Department of Horticulture, Genome Research Center, Chungnam National University, Kung-Dong 220, Yusong-Gu, Daejeon 305-764, South Korea.
Summary
Researchers developed a reference genetic linkage map for the Brassica A genome using 556 markers. This map aids in anchoring genome sequences and improving Brassica crops.
Area of Science:
- Plant genetics
- Genomics
- Molecular biology
Background:
- A high-density genetic linkage map is crucial for genome sequencing projects.
- The Brassica A genome is a key component of several important Brassica species.
Purpose of the Study:
- To construct a high-resolution reference genetic linkage map for the Brassica A genome.
- To facilitate the anchoring of sequence contigs for the Multinational Brassica rapa Genome Sequencing Project.
- To enable integration of genomic sequence and genetic information for Brassica research.
Main Methods:
- Utilized 78 doubled haploid lines derived from a cross between two Chinese cabbage inbred lines.
- Employed a combination of 556 markers: 278 AFLP, 235 SSR, 25 RAPD, and 18 ESTP, STS, and CAPS markers.
- Identified 10 linkage groups (R1-R10) and aligned them with existing Brassica napus maps using SSR markers.
Main Results:
- Developed a 1,182 cM genetic linkage map with an average interval of 2.83 cM between loci.
- Established alignment between the A-genome chromosomes of Brassica napus and Brassica rapa ssp. pekinensis using 235 SSR markers.
- Detailed map characteristics including linkage group lengths (81-161 cM).
Conclusions:
- The constructed map serves as a foundational resource for the Brassica genome sequencing initiative.
- This genetic map is vital for integrating sequence data and advancing Brassica genetics.
- Facilitates international collaboration and resource sharing for Brassica crop improvement.
