Research Article Comparing SNP-based genetic linkage and physical maps in guava (Psidium guajava)

Medeiros, F; Santos, C. A. F.; Costa, Alessia

doi:10.4238/gmr19033

Cited by 1 publication

(2 citation statements)

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“…From our results, we can assume that the chromosome number and LG number that harbors the QTL regions for color-related traits may not have synteny. It was recently proposed that the segments/regions of the guava linkage map contained LGs that acquired segments from different chromosomes ( Medeiros et al., 2022 ). Hence it would be interesting to further investigate the position of the identified QTL clusters in the guava genome and the candidate genes associated with color traits.…”

Section: Discussionmentioning

confidence: 99%

“…The low coverage due to a smaller number of markers on the map limited the capability of associating a particular trait to the closest marker. Recently, Medeiros et al (2022) constructed a genetic linkage map incorporating 203 SNPs generated from a DNA marker chip which also did not provide complete coverage of LGs. The GBS approach employed in our study has resulted in good genome coverage and genome-wide SNP identification when compared with the previous reports.…”

Section: Linkage Map Construction Using Snp Markersmentioning

confidence: 99%

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A high-density linkage map construction in guava (Psidium guajava L.) using genotyping by sequencing and identification of QTLs for leaf, peel, and pulp color in an intervarietal mapping population

Mathiazhagan,

Elangovan,

Chinnaiyan

et al. 2024

Front. Plant Sci.

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Psidium guajava L. is an important fruit crop in the tropical and subtropical regions of the world. The advanced breeding methods are not employed for important commercial traits like peel and pulp color, seed hardiness, fruit size, etc., due to the scarcity of genome-wide molecular markers and high-density linkage maps. In this study, we employed single-nucleotide polymorphism (SNP) markers and identified quantitative trait loci (QTL) regions that are associated with color traits of leaf, peel, and pulp in the guava intervarietal mapping population. The mapping population was developed from the contrasting genotypes of fruit and leaf color. Variations in color among the segregating hybrids were recorded both visually and using a Color reader. A high-density linkage map of guava was constructed using the SNP markers from genotyping by sequencing (GBS) of 150 hybrid individuals of the cross ‘Arka Poorna’ (green) x ‘Purple Local’ (purple). The integrated linkage map consisted of 1426 SNPs mapped on 11 linkage groups (LG), spanning a total distance of around 730 cM with an average of 129.6 markers per LG. Through QTL analysis for color traits, a minor QTL region was identified for visually scored leaf color and peel color on LG1, whereas a major QTL was detected for pulp color in LG4. The Hunter color values (L* and, a*) also had major QTLs with overlapping marker intervals for leaf and peel colors, establishing the association of SNP markers to the trait. The QTLs harbored genes and transcription factors involved in lycopene and anthocyanin pigment biosynthesis. This is the first report of a high-density linkage map based on SNP markers in guava and QTL mapping for color characters in leaf, fruit peel and pulp. The genotyping information generated in this study can aid in genetic engineering and marker-assisted breeding in guava.

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Section: Discussionmentioning

confidence: 99%

Section: Linkage Map Construction Using Snp Markersmentioning

confidence: 99%