ISHS Acta Horticulturae 713: VI International Peach Symposium
NEW DETECTION OF QTLS CONTROLLING MAJOR FRUIT QUALITY COMPONENTS IN PEACH |
| Authors: | E. Dirlewanger, P. Cosson, C. Renaud, R. Monet, J.L. Poëssel, A. Moing |
| Keywords: | fruit quality, Prunus persica, genetic linkage map, quantitative trait loci, soluble sugars, organic acids, phenolics |
| Abstract:
Fruit quality is one of the main criteria for the selection of fruit of Rosaceae. The organoleptic quality of fleshy fruits is mainly defined by their soluble sugar and organic acid composition. The nutritional quality is partly determined by the phenolic compounds of the fruit that affect human health by limiting oxidations involved in cardiovascular disease. Also produce significant effects on taste and flavor of the fruit. A genetic linkage map was constructed from a peach F2 population of 208 individuals (‘Ferjalou Jalousia’® x ‘Fantasia’) (J x F). This population segregated for 6 Mendelian traits: peach or nectarine (G), flat fruit (S), non-acid fruit (D), clingstone or freestone (F), male sterility (Ps), no fruit at maturity (nfam). This population was analyzed during two years for fruit development characters, fruit acidity and sweetness, fruit weight and during one year for fruit phenolics. All Mendelian traits had a segregation ratio in agreement with single gene segregation and were mapped. QTLs were detected for nearly all characters: dry matter content, titratable acidity (TA), fruit pH, soluble solids content (SSC), organic acids (malic, citric, quinic), soluble sugars (sucrose, glucose, fructose, sorbitol, raffinose), total soluble phenolics, soluble and insoluble proanthocyanidins. No QTLs were detected for succinic, fumaric and isocitric acids that were in low concentration in fruits. QTLs with major effects on TA, pH and organic acid (malic acid, citric acid) were detected in the upper part of linkage group 5, where the D gene is located. In the same region, QTLs with lower effects were detected for all soluble sugars. This suggests that this region includes gene(s) with main metabolic determinants for fruit quality. | |
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