Quilot B, Wu B H, Kervella J, Génard M, Foulongne M, Moreau K
Plantes et Systèmes de Culture Horticoles, Institut National de la Recherche Agronomique (INRA), Domaine St Paul, Site Agroparc, 84914 Avignon cedex 9, France.
Theor Appl Genet. 2004 Aug;109(4):884-97. doi: 10.1007/s00122-004-1703-z. Epub 2004 May 27.
Genetic control of the different attributes involved in peach quality has been investigated in an advanced backcross population derived from a cross between Prunus davidiana clone P1908, a wild parent with poor agronomic performance, and a commercial variety, Summergrand. A total of 24 physical and biochemical traits were investigated. Quantitative trait loci (QTLs) were detected for all the traits studied. We identified alleles from P. davidiana with agronomically favorable effects regarding fruit and stone sizes, sugar and acid concentrations and red flesh coloration, in clear contrast to its phenotype. We identified three main regions of the genome where alleles from P. davidiana had negative effects on multiple traits. In other regions, co-locations of QTLs with opposite effects on quality traits were also detected. We discuss the nature of these co-locations in the light of the probable physiological mechanisms involved. Strategies to cope with negative correlations between favorable traits and co-locations of P. davidiana alleles with negative effects on quality traits and positive effects regarding resistance to powdery mildew are discussed from a breeding point of view.
在一个高级回交群体中，对桃品质相关不同属性的遗传控制进行了研究。该群体源自山桃克隆P1908（一个农艺性状较差的野生亲本）与商业品种Summergrand的杂交。共研究了24个物理和生化性状。对所有研究性状均检测到了数量性状基因座（QTL）。我们鉴定出了山桃中对果实和果核大小、糖和酸浓度以及红肉着色具有农艺学有利效应的等位基因，这与其表型形成鲜明对比。我们确定了基因组中的三个主要区域，其中山桃的等位基因对多个性状具有负面影响。在其他区域，也检测到了对品质性状具有相反效应的QTL共定位。我们根据可能涉及的生理机制讨论了这些共定位的性质。从育种角度讨论了应对有利性状之间的负相关以及山桃等位基因对品质性状具有负面影响而对白粉病抗性具有正面影响的共定位的策略。
