Genetic Diversity in Pistacia Species
Summary
Genetic diversity in the genus Pistacia underpins both the resilience of wild populations and the advancement of cultivated pistachio (Pistacia vera). Broadly distributed across Central Asia, the Mediterranean and North Africa, wild species such as P. atlantica, P. terebinthus and P. lentiscus harbour allelic variants that confer tolerance to drought, salinity and pathogen stress. In contrast, cultivated P. vera displays a narrower genetic base, a legacy of its domestication history and clonal propagation through grafting. Molecular studies employing markers such as simple sequence repeats (SSR), inter-simple sequence repeats (ISSR) and expressed sequence-derived SSRs (eSSR) have revealed high levels of heterozygosity and distinct genetic clusters corresponding to geographic provenance and evolutionary lineage. Genome surveys estimate the pistachio genome at approximately 600 Mb and indicate pronounced heterozygosity, complicating whole-genome assembly but providing a rich source of polymorphism for germplasm characterisation. Conservation of wild gene pools is of growing urgency, as habitat loss and monoculture cultivation erode natural diversity. Advances in micropropagation, cryopreservation and computer-aided experimental design have enhanced ex situ conservation efforts. Integrating phylogenetic insights with genotyping informs both rootstock selection and breeding programmes aimed at broadening the genetic base of cultivated pistachio, thereby securing yield stability and adaptive potential in the face of climate change.
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Genetic Diversity in Pistacia Species publication trend
The graph below shows the total number of articles in genetic diversity in pistacia species across all publications each year (not limited to Nature Index journals).
Technical terms
Simple Sequence Repeat (SSR): A short, tandemly repeated DNA motif used as a molecular marker to assess genetic variation and population structure.
Heterozygosity: The presence of different alleles at a genetic locus, serving as an indicator of genetic diversity within individuals or populations.
Germplasm: Living genetic resources—such as seeds, tissues or cells—maintained for breeding, preservation and research of plant diversity.
References
- History, Phylogeny, Biodiversity, and New Computer-Based Tools for Efficient Micropropagation and Conservation of Pistachio (Pistacia spp.) Germplasm. Plants (2023).
- Genome survey of pistachio (Pistacia vera L.) by next generation sequencing: Development of novel SSR markers and genetic diversity in Pistacia species. BMC Genomics (2016).
- Pistachio (Pistacia vera L.) Domestication and Dispersal Out of Central Asia. Agronomy (2022).
- Genetic Diversity and Relationships of Terebinth (Pistacia terebinthus L.) Genotypes Growing Wild in Turkey. Agronomy (2021).
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