Inheritance of Fruit Quality Traits in Apricot Progenies.

The knowledge on the transmission of fruit quality traits has a great importance in order to optimize the inter-cultivar crosses design and to improve the efficiency of apricot breeding programmes. Four apricot progenies issued from different genetic origins were evaluated during two years; two apricot progenies cultivated in Avignon (France), one in Bologna (Italy), and other one in Murcia (Spain). Fruit quality characterization was based on physical measurements (fruit weight, colour, and firmness) and biochemical measurements (soluble solids content, and titratable acidity). Phenotypic datasets showed distribution of seedlings with regard to the parents, with a high variability for all analyzed quality parameters. An inter-annual variation was observed for the mean values of all the genotypes between the two years of the study, indicating the influence of the environmental conditions on fruit characteristics. Results indicated a quantitative inheritance of all quality traits in the apricot progenies indicating their polygenic nature. In general we observed in most cases a normal distribution of quality traits in the observed populations. However, in contrast to intermediate expected values between the parents, a large number of seedlings showed lower or higher values than their parents for many quality parameters. In this sense, results evidenced an extra genetic influence of the parents (the whole genetic background) on the transmission of fruit quality traits in apricot, which should be taken into consideration with intercultivar crosses design

Inheritance of fruit quality traits in apricot progenies

International audienc

Inheritance of phenological traits in apricot progenies.

International audienc

Inheritance of phenological traits in apricot progenies

International audienceThe impact of global changes is becoming a serious concern at a world scale, and its influence could be rather large on perennial plant behaviour. Within fruit species, advances in blooming dates and floral disorders in relation to temperature increase during period of dormancy and bud burst have already been shown. Unfortunately among fruit species, apricot is expected to be one of the most susceptible in relation to the restricted adaptation of the local cultivars to narrow geographic areas. Thus, in order to overcome the negative trends and to safeguard apricot fruit production, the identification of the genetic components involved in blooming and maturity periods becomes of major interest. A global genetic analysis has been conducted on 4 apricot progenies issued from different genetic backgrounds; two progenies were cultivated in Avignon (Fr), one in Bologna (It), and one in Murcia (Sp). The four progenies were phenotyped for blooming and maturity dates at least for 2 years (except the Italian one evaluated only for the maturity date). The segregations have been examined and QTL analyses have been performed on the whole data set. The QTL stability across years has been analysed for the two traits. The influence of the genetic background has been discussed

Inheritance of Phenological Traits in Apricot Progenies

The impact of global changes is becoming a serious concern at a world scale, and its influence could be rather large on perennial plant behaviour. Within fruit species, advances in blooming dates and floral disorders in relation to temperature increase during period of dormancy and bud burst have already been shown. Unfortunately among fruit species, apricot is expected to be one of the most susceptible in relation to the restricted adaptation of the local cultivars to narrow geographic areas. Thus, in order to overcome the negative trends and to safeguard apricot fruit production, the identification of the genetic components involved in blooming and maturity periods becomes of major interest. A global genetic analysis has been conducted on 4 apricot progenies issued from different genetic backgrounds; two progenies were cultivated in Avignon (Fr), one in Bologna (It), and one in Murcia (Sp). The four progenies were phenotyped for blooming and maturity dates at least for 2 years (except the Italian one evaluated only for the maturity date). The segregations have been examined and QTL analyses have been performed on the whole data set. The QTL stability across years has been analysed for the two traits. The influence of the genetic background has been discussed

Study of the genetic basis of Prunus fruit quality in 2 peach and 2 apricot populations \u2013 ISAFRUIT WP6-1 IP-Project.

Within the ISAFRUIT European Integrated Project, a work package (6.1) is dedicated to the genetic bases of fruit quality and health properties. It is subdivided into six main tasks, two of them for the apricot and peach quality attributes: task 1 \u201cIdentification and mapping of candidate genes for fruit quality in saturated maps of peach and apricot\u201d and task 3 \u201cQTLs analysis of fruit quality\u201d. Six laboratories are involved in theses tasks on Prunus species and 4 Prunus progenies of 120 seedlings each are being used: two apricot progenies grown in Avignon (F) and Bologna (I), and two peach progenies grown in Avignon and Bordeaux (F). Fruit quality characterization is based on (i) physical measurements (fruit weight, colour, firmness), (ii) biochemical measurements (soluble solids content, titratable acidity) and (iii) fine metabolic profiling based on 1H RMN 1D targeting the major metabolites, associated with a phenolic compound characterization by HPLC. Saturated genetic linkage maps have been constructed for each progeny both in apricot and peach, and the phenotypic datasets will be joined with the genetic map for localising the associated QTLs. Identification and mapping of candidate genes for fruit quality traits will be the subsequent step. Particular attention will be paid to the co-linearity between species