ISHS Acta Horticulturae 713: VI International Peach Symposium
COMBINING ECOPHYSIOLOGICAL AND GENETIC MODELS TO ANALYSE PEACH ORGANOLEPTIC QUALITY |
| Authors: | B. Quilot, J. Kervella, T. Pascal, B.H. Wu, M. Génard, F. Lescourret |
| Keywords: | modelling, ecophysiology, quantitative genetics, peach, fruit quality |
| Abstract:
We evaluated the possibility of using ecophysiological models to describe genetic variations observed in a population, identify QTLs (Quantitative Trait Loci) for the model parameters and combine QTLs and ecophysiological models. This approach was applied to peach quality observed in an advanced backcross between Prunus persica (L.) Batsch and Prunus davidiana. The ecophysiological model predicts fruit and stone dry and fresh masses and total sugar concentration in relation to environmental conditions. A preliminary study was conducted to select relevant parameters among the 40 parameters of the models. In a first step these parameters were estimated experimentally for nearly 130 individuals of the population and independent data were acquired to test the predictive quality of the model. In a second step, model analysis allowed us to identify the genotypic key-parameters. In a third step, QTL analysis resulted in the description of a model of genetic control of these parameters which predicts the parameter values for any genotype according to the alleles present at each locus of interest. To combine ecophysiological and genetic models, we replaced in the ecophysiological model the measured values of the parameters by the values predicted by the genetic model. Twelve genotypic parameters, involved in identified ecophysiological processes, appeared essential. QTLs for the twelve parameters were detected and co-locations between QTLs for quality traits and QTLs for parameters were observed. The combined model was satisfactory. Results of this study were considered in order to discuss the interest of such an approach for selection and biological understanding. | |
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