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Genomic Analyses Yield Markers for Identifying Agronomically Important Genes in Potato
Yangping Li1, Christophe Colleoni2, Junjie Zhang3
1College of Agronomy, Sichuan Agricultural University, Chengdu, China; Joint International Research Laboratory of Crop Resources and Genetic Improvement of Ministry of Education, Sichuan Agricultural University, Chengdu, China.
Molecular Plant
|February 9, 2018
Summary
Wild potato genomes reveal greater diversity than cultivated varieties, especially in disease resistance genes. This genomic data aids in identifying key genes for future potato breeding and understanding domestication traits.
Area of Science:
- Genomics
- Plant Science
- Agricultural Science
Background:
- Wild potato species (Solanum section Petota) exhibit significant phenotypic and physiological diversity.
- Understanding this diversity is crucial for improving cultivated potato varieties through breeding.
Purpose of the Study:
- To conduct a comprehensive genomic assessment of wild and cultivated potato species.
- To identify genetic variations, genes under selection, and evolutionary relationships within Solanum section Petota.
- To provide molecular markers for potato breeding.
Main Methods:
- Genomic sequencing of 201 potato accessions.
- Identification and analysis of single nucleotide polymorphisms (SNPs).
- Phylogenetic analysis and genome-wide genetic variation analysis.
Main Results:
- Identified 6,487,006 high-quality SNPs from 167 accessions.
- Wild potatoes possess higher genetic diversity than cultivated ones, particularly in disease resistance genes.
- Identified 609 genes under selection related to domestication traits (e.g., loss of bitterness, tuberization).
- Confirmed Solanum candolleanum as the progenitor of cultivated potato, with a monophyletic origin in southern Peru.
- Identified 529 genes lost in cultivated potato compared to S. candolleanum.
Conclusions:
- Genomic diversity in wild potatoes offers valuable resources for crop improvement.
- Selection signatures highlight genes critical for potato domestication.
- Phylogenetic insights clarify the evolutionary history and origin of cultivated potato.
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