Abstract
BACKGROUND: The improvement of fruit aroma is currently one of the most sought-after objectives in peach breeding programs. To better characterize and assess the genetic potential for increasing aroma quality by breeding, a quantity trait locus (QTL) analysis approach was carried out in an F1 population segregating largely for fruit traits. RESULTS: Linkage maps were constructed using the IPSC peach 9 K Infinium ® II array, rendering dense genetic maps, except in the case of certain chromosomes, probably due to identity-by-descent of those chromosomes in the parental genotypes. The variability in compounds associated with aroma was analyzed by a metabolomic approach based on GC-MS to profile 81 volatiles across the population from two locations. Quality-related traits were also studied to assess possible pleiotropic effects. Correlation-based analysis of the volatile dataset revealed that the peach volatilome is organized into modules formed by compounds from the same biosynthetic origin or which share similar chemical structures. QTL mapping showed clustering of volatile QTL included in the same volatile modules, indicating that some are subjected to joint genetic control. The monoterpene module is controlled by a unique locus at the top of LG4, a locus previously shown to affect the levels of two terpenoid compounds. At the bottom of LG4, a locus controlling several volatiles but also melting/non-melting and maturity-related traits was found, suggesting putative pleiotropic effects. In addition, two novel loci controlling lactones and esters in linkage groups 5 and 6 were discovered. CONCLUSIONS: The results presented here give light on the mode of inheritance of the peach volatilome confirming previously loci controlling the aroma of peach but also identifying novel ones.
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Claims 6
Claim · model-written summary
Peach linkage maps were dense except for certain chromosomes.
Verbatim
e0“rendering dense genetic maps, except in the case of certain chromosomes”
Claim · model-written summary
Peach aroma volatiles formed chemical and biosynthetic modules.
- Taxon
- peach
Prunus persicae0 - Compound
- compounds from the same biosynthetic origine0
- Outcome
- volatilome is organized into modulese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the peach volatilome is organized into modules formed by compounds from the same biosynthetic origin or which share similar chemical structures”
Claim · model-written summary
QTL for volatiles in the same modules clustered.
Not reportedTaxonDirection
Verbatim
e0“clustering of volatile QTL included in the same volatile modules”
t0“peach”
Claim · model-written summary
A locus at the top of LG4 controlled the monoterpene module.
Not reportedTaxonDirection
Verbatim
e0“The monoterpene module is controlled by a unique locus at the top of LG4”
t0“peach”
Claim · model-written summary
A locus at the bottom of LG4 controlled several volatiles and maturity traits.
Not reportedTaxonDirection
Verbatim
e0“At the bottom of LG4, a locus controlling several volatiles but also melting/non-melting and maturity-related traits was found”
t0“peach”
Claim · model-written summary
Novel loci controlling lactones and esters were found in LG5 and LG6.
Not reportedTaxonDirection
Verbatim
e0“two novel loci controlling lactones and esters in linkage groups 5 and 6 were discovered”
t0“peach”