Genetic Diversity and Population Structure in Brassica Species
Summary
Brassica encompasses several globally important crop species, including B. rapa, B. oleracea and the allopolyploid B. napus, each exhibiting remarkable morphological and ecological variation. Genetic diversity within and among these species underpins adaptation to diverse climates, resistance to pests and pathogens, and the development of novel cultivars. Population structure analyses reveal that historical domestication, polyploidisation events and extensive gene flow with wild relatives have shaped contemporary genomes. Wild progenitors and crop wild relatives contribute allelic variation that may be obscured by traditional comparative approaches, necessitating methods that account for admixture and complex phylogenies. Advances in high-throughput genotyping and whole-genome resequencing have enabled the elucidation of introgression patterns, identification of selection footprints and resolution of multiple domestication lineages. Understanding these patterns is pivotal for breeding strategies aimed at enhancing yield, nutritional quality and resilience under changing environmental conditions.
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Genetic Diversity and Population Structure in Brassica Species publication trend
The graph below shows the total number of articles in genetic diversity and population structure in brassica species across all publications each year (not limited to Nature Index journals).
Technical terms
Genetic diversity: Variation in alleles, genes and genotypes within and among populations, providing raw material for adaptation and breeding.
Population structure: The organisation of genetic variation into subgroups due to factors such as geography, selection, mating patterns and historical events.
Introgression: The incorporation of genetic material from one population or species into another through hybridisation and backcrossing.
Polyploidy: The condition of possessing more than two complete sets of chromosomes, often resulting from interspecific hybridisation.
Single nucleotide polymorphism (SNP): A single base-pair variation in the DNA sequence among individuals, used as a marker for genetic diversity and association studies.
References
- Extensive crop–wild hybridization during Brassica evolution and selection during the domestication and diversification of Brassica crops. Genetics (2023).
- Interploidy Introgression Shaped Adaptation during the Origin and Domestication History of Brassica napus. Molecular Biology and Evolution (2023).
- Evidence for two domestication lineages supporting a middle-eastern origin for Brassica oleracea crops from diversified kale populations. Horticulture Research (2022).
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