Genetic Diversity and Phytochemical Characterization in Capsicum Species
Summary
Capsicum comprises over 30 species, including five domesticated forms that exhibit remarkable genetic and phytochemical variation. Advances in genomics, such as pan-genome assembly, high-throughput SNP genotyping and transcriptome sequencing, have illuminated population structure, domestication sweeps and interspecific introgressions. These efforts reveal how distinct genomic regions underlie variation in flowering time, fruit morphology, pungency and stress tolerance. Concurrently, detailed phytochemical analyses document wide-ranging profiles of capsaicinoids, the alkaloids responsible for heat, and carotenoids, which confer colour and antioxidant capacity. The integration of genetic diversity studies with metabolite profiling informs breeding programmes aimed at enhancing nutritional quality, flavour and resilience, addressing global challenges in food security, human health and sustainable agriculture.
Research from Nature Portfolio
Recent studies have constructed a comprehensive graph pan-genome encompassing both cultivated and wild Capsicum accessions. Analysis of 500 genomes across five domesticated species identified highly differentiated genomic regions associated with key agronomic traits, including fruit size, shape and pungency. Distinct domestication sweeps in C. annuum and C. baccatum target different loci yet converge on similar phenotypes, while interspecific introgressions from C. baccatum into C. chinense and C. frutescens contribute alleles for enhanced biotic and abiotic stress resistance. This work refines our understanding of pepper evolution and provides a genomic resource for the targeted exploitation of wild diversity in breeding.
Genetic Diversity and Phytochemical Characterization in Capsicum Species publication trend
The graph below shows the total number of articles in genetic diversity and phytochemical characterization in capsicum species across all publications each year (not limited to Nature Index journals).
Technical terms
Pan-genome: The combined set of core and variable genes found across multiple genomes of a species.
Single nucleotide polymorphism (SNP): A single-base variation in DNA sequence among individuals, often used as a genetic marker.
Capsaicinoids: Pungent alkaloid compounds unique to Capsicum fruits, central to heat sensation and linked to health benefits.
Carotenoids: Pigmented isoprenoid molecules in plant tissues that provide red, orange and yellow colours and function as antioxidants.
Genome-wide association study (GWAS): A method that scans many SNPs across the genome to identify associations with phenotypic traits in diverse populations.
Quantitative trait locus (QTL): A genomic region that correlates with variation in a quantitative trait, often encompassing multiple genes.
References
- Genomes of cultivated and wild Capsicum species provide insights into pepper domestication and population differentiation. Nature Communications (2023).
- Carotenoids of Capsicum Fruits: Pigment Profile and Health-Promoting Functional Attributes. Antioxidants (2019).
- Capsaicinoids, Polyphenols and Antioxidant Activities of Capsicum annuum: Comparative Study of the Effect of Ripening Stage and Cooking Methods. Antioxidants (2019).
- QTL mapping and GWAS reveal candidate genes controlling capsaicinoid content in Capsicum. Plant Biotechnology Journal (2018).
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