Genetic Diversity Assessment in Avocado Germplasm
Summary
Genetic diversity assessment in avocado germplasm combines molecular marker technologies with population genomics to characterise variation across the species’ three botanical races—Mexican, Guatemalan and West Indian. Widespread reliance on a narrow genetic base, typified by the ‘Hass’ cultivar, has heightened vulnerability to pests, diseases and climatic stresses. Contemporary studies employ single nucleotide polymorphisms, simple sequence repeats and transcriptome sequencing to unravel population structure, quantify heterozygosity and identify core collections for conservation. These insights inform breeding strategies aimed at broadening the gene pool, improving fruit quality and enhancing resilience, while supporting both in situ and ex situ conservation of global germplasm repositories.
Research from Nature Portfolio
Recent studies have produced a draft assembly of the Persea americana ‘Hass’ genome and employed it as a reference to survey genetic variation across a representative panel of accessions spanning Mexican, Guatemalan and West Indian races. Over 7,000 high-quality single nucleotide polymorphism markers were generated, revealing clear separation of botanical races, identifying Guatemalan × Mexican hybrids, and providing the most extensive SNP resource to date for global avocado breeding programmes. This genomic framework has underpinned refined characterisation of population structure and offers a robust platform for future genome-wide association studies and marker-assisted selection.
Genetic Diversity Assessment in Avocado Germplasm publication trend
The graph below shows the total number of articles in genetic diversity assessment in avocado germplasm across all publications each year (not limited to Nature Index journals).
Technical terms
Germplasm: Living plant material, such as seeds or tissues, conserved for breeding and conservation of genetic resources.
Single nucleotide polymorphism (SNP): A variation at a single DNA base position among individuals, used as a genetic marker.
Population structure: The organisation of genetic diversity within and among groups, reflecting historical relationships and breeding practices.
Genome-wide association study (GWAS): An analysis linking genetic markers across the entire genome with phenotypic traits in diverse populations.
Marker-assisted selection (MAS): The use of DNA markers to inform and accelerate the selection of desirable traits in breeding programmes.
Heterozygosity: The presence of different alleles at a genetic locus within an individual, indicative of genetic diversity.
References
- Comprehensive genetic diversity and genome-wide association studies revealed the genetic basis of avocado fruit quality traits. Frontiers in Plant Science (2024).
- Genome-Wide SNP discovery and genomic characterization in avocado (Persea americana Mill.). Scientific Reports (2019).
- Genetic diversity of avocado (Persea americana Mill.) germplasm using pooled sequencing. BMC Genomics (2019).
- Creation of an avocado unambiguous genotype SNP database for germplasm curation and as an aid to breeders. Tree Genetics & Genomes (2019).
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