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Published (Version of record)Maximising recombination across macadamia populations to generate linkage maps for genome anchoringCC BY V4.0, Open Access
Journal article
Maximising recombination across macadamia populations to generate linkage maps for genome anchoring
Scientific Reports, Vol.10, 5048
19/03/2020
PMID: 32193408
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Abstract
The Proteaceae genus Macadamia has a recent history of domestication as a commercial nut crop. We aimed to establish the first sequence-based haploid-correlated reference genetic linkage maps for this primarily outcrossing perennial tree crop, with marker density suitable for genome anchoring. Four first generation populations were used to maximise the segregation patterns available within full-sib, biparental and self-pollinated progeny. This allowed us to combine segregation data from overlapping subsets of >4,000 informative sequence-tagged markers to increase the effective coverage of the karyotype represented by the recombinant crossover events detected. All maps had 14 linkage groups, corresponding to the Macadamia haploid chromosome number, and enabled the anchoring and orientation of sequence scaffolds to construct a pseudo-chromosomal genome assembly for macadamia. Comparison of individual maps indicated a high level of congruence, with minor discrepancies satisfactorily resolved within the integrated maps. The combined set of maps significantly improved marker density and the proportion (70%) of the genome sequence assembly anchored. Overall, increasing our understanding of the genetic landscape and genome for this nut crop represents a substantial advance in macadamia genetics and genomics. The set of maps, large number of sequence-based markers and the reconstructed genome provide a toolkit to underpin future breeding that should help to extend the macadamia industry as well as provide resources for the long term conservation of natural populations in eastern Australia of this unique genus.
Details
- Title
- Maximising recombination across macadamia populations to generate linkage maps for genome anchoring
- Creators
- Kirsty S Langdon - Southern Cross UniversityGaham J King - Southern Cross UniversityAbdul K M Baten - Southern Cross UniversityRamil Mauleon - Southern Cross UniversityPeter C Bundock - Southern Cross UniversityBruce L Topp - University of QueenslandCatherine Jane Nock (Corresponding Author) - Southern Cross University
- Publication Details
- Scientific Reports, Vol.10, 5048
- Publisher
- Nature Research
- Identifiers
- 991012862797002368
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; Science; Southern Cross Plant Science
- Language
- English
- Resource Type
- Journal article