Abstract
Genetic control and location of QTLs associated with phytochemical compounds and fruit quality in peach [Prunus persica (L.) Batsch] were evaluated using an F2 mapping population (ZC2) derived from cross between ‘Zin Dai’ × ‘Crimson Lady’. Antioxidant capacity, accumulation of phenolic compounds (total phenolics, flavonoids, and anthocyanins), and fruit quality traits (fruit diameter, fruit weight, fruit firmness, soluble solids concentration, titratable acidity, and ripening index) were evaluated for 2 years (2013–2014). Fourteen QTLs for phytochemical and fruit quality traits were identified in 5 LGs, with two QTL clusters (qPC.ZC_5.1_2014 and qPC.ZC_7.1) observed on LGs 5 and 7. The QTL cluster qPC.ZC_5.1_2014 was associated with antioxidant capacity, flavonoids, anthocyanin content, and SSC, while qPC.ZC_7.1 exhibited association only with flavonoids and fruit ripening index. QTL clusters associated with different fruit quality traits were observed on LGs 1 and 6. Candidate gene analyses of the QTL cluster on LG5 (qPC.ZC_5.1_2014) revealed 14 candidate genes in peach with functional annotation related to biosynthesis pathway of phytochemical compounds.
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Abbreviations
- ATCYN:
-
Anthocyanin
- C3GE:
-
Cyanidin-3-glucoside equivalents
- CE:
-
Catechin equivalents
- CG:
-
Candidate gene
- FRDIA:
-
Fruit diameter
- FRFRM:
-
Fruit firmness
- FRRP:
-
Fruit ripening, ripening index
- FRW:
-
Fruit weight
- FV:
-
Flavonoids
- FW:
-
Fresh weight
- GAE:
-
Gallic acid equivalents
- GDR:
-
Genome Database for Rosaceae
- IM:
-
Interval mapping
- KW:
-
Kruskal-Wallis
- LG:
-
Linkage group
- LOD:
-
Logarithm of the odds
- MQM:
-
Multiple QTL mapping
- PHE:
-
Total phenolics
- QTL:
-
Quantitative trait loci
- RAC:
-
Relative antioxidant capacity
- SNP:
-
Single nucleotide polymorphism
- SSC:
-
Soluble solids concentration
- TE:
-
Trolox equivalents
- TITA:
-
Titratable acidity
- ZC2:
-
Zin Dai × Crimson Lady
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We gratefully acknowledge the financial contributions towards AA PhD from the CBIE Libyan-North American Scholarship Program.
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This work was supported by the Specialty Crop Block Grant Program at the US Department of Agriculture through grant 12-25-B-1695. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the USDA.
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AA collected and analyzed the data and wrote the manuscript; CDSL assisted with data analyses and manuscript preparation; KG designed the experiment, provided the resources for data collection, and assisted with data analyses and manuscript preparation; WRO provided the F2 material, and all authors read and approved the final manuscript.
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Abdelghafar, A., da Silva Linge, C., Okie, W.R. et al. Mapping QTLs for phytochemical compounds and fruit quality in peach. Mol Breeding 40, 32 (2020). https://doi.org/10.1007/s11032-020-01114-y
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DOI: https://doi.org/10.1007/s11032-020-01114-y