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Genome-wide association mapping reveals race-specific SNP markers associated with anthracnose resistance in carioca common beans
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Genome-wide association mapping reveals race-specific SNP markers associated with anthracnose resistance in carioca common beans
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Genome-wide association mapping reveals race-specific SNP markers associated with anthracnose resistance in carioca common beans
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Journal Article
Genome-wide association mapping reveals race-specific SNP markers associated with anthracnose resistance in carioca common beans
2021
Overview
Brazil is the largest consumer of dry edible beans (
Phaseolus vulgaris
L.) in the world, 70% of consumption is of the carioca variety. Although the variety has high yield, it is susceptible to several diseases, among them, anthracnose (ANT) can lead to losses of up to 100% of production. The most effective strategy to overcome ANT, a disease caused by the fungus
Colletotrichum lindemuthianum
, is the development of resistant cultivars. For that reason, the selection of carioca genotypes resistant to multiple ANT races and the identification of
loci
/markers associated with genetic resistance are extremely important for the genetic breeding process. Using a carioca diversity panel (CDP) with 125 genotypes and genotyped by BeadChip BARCBean6K_3 and a carioca segregating population AM (AND-277 × IAC-Milênio) genotyped by sequencing (GBS). Multiple interval mapping (MIM) and genome-wide association studies (GWAS) were used as mapping tools for the resistance genes to the major ANT physiological races present in the country. In general, 14 single nucleotide polymorphisms (SNPs) showed high significance for resistance by GWAS, and
loci
associated with multiple races were also identified, as the
Co-3 locus
. The SNPs ss715642306 and ss715649427 in linkage disequilibrium (LD) at the beginning of chromosome Pv04 were associated with all the races used, and 16 genes known to be related to plant immunity were identified in this region. Using the resistant cultivars and the markers associated with significant quantitative resistance
loci
(QRL), discriminant analysis of principal components (DAPC) was performed considering the allelic contribution to resistance. Through the DAPC clustering, cultivar sources with high potential for durable anthracnose resistance were recommended. The MIM confirmed the presence of the
Co-1
4
locus
in the AND-277 cultivar which revealed that it was the only one associated with resistance to ANT race 81. Three other
loci
were associated with race 81 on chromosomes Pv03, Pv10, and Pv11. This is the first study to identify new resistance
loci
in the AND-277 cultivar. Finally, the same
Co-1
4
locus
was also significant for the CDP at the end of Pv01. The new SNPs identified, especially those associated with more than one race, present great potential for use in marker-assisted and early selection of inbred lines.
