Centre de Recherches de Bordeaux, INRA, Unité de Recherches sur les Espèces Fruitières et la Vigne, BP 81, 33883, Villenave d'Ornon Cedex, France.
Theor Appl Genet. 1996 Oct;93(5-6):909-19. doi: 10.1007/BF00224093.
A progeny of 77 hybrids issued from a cross between two heterozygous Prunus, peach [P. persica (L.) Batsch] (variety 'Summergrand') and a related species, P. davidiana (clone 1908), was analysed for powdery mildew resistance in five independent experiments. This population was also analysed for its genotype with isoenzyme and RAPD markers in order to map the genes responsible for resistance. A genetic linkage map was generated for each parent. The 'Summergrand' linkage map is composed of only four linkage groups including 15 RAPD markers and covering 83.1 centiMorgans (cM) of the peach nuclear genome, whereas the P. davidiana linkage map contains 84 RAPD markers and one isoenzyme assigned to ten linkage groups and covering 536 cM. Significant associations between molecular markers and powdery mildew resistance were found in each parent. For P. davidiana, one major QTL with a very strong effect and five other QTLs with minor effects were located in different linkage groups. For 'Summergrand', three QTLs for powdery mildew resistance, with minor effects, were also detected. Consequently, evidence is given here that the powdery mildew resistance of P. davidiana clone 1908 and P. persica variety 'Summergrand' is not a monogenic character but is controlled by at least one major gene and several minor genes.
从两个杂合的李属品种，即桃（Prunus persica (L.) Batsch）（品种‘Summergrand’）和一个亲缘种李属品种，Prunus davidiana（克隆 1908）杂交产生的 77 个杂种后代中，有一个品系在五个独立的实验中被分析了对白粉病的抗性。该群体还使用同工酶和 RAPD 标记进行了基因型分析，以定位与抗性相关的基因。为每个亲本生成了一个遗传连锁图谱。‘Summergrand’连锁图谱仅由四个连锁群组成，包括 15 个 RAPD 标记，覆盖了桃核基因组的 83.1 厘摩（cM），而李属品种的 P. davidiana 连锁图谱包含 84 个 RAPD 标记和一个同工酶，分配给十个连锁群，覆盖了 536 厘摩。在每个亲本中都发现了分子标记与白粉病抗性之间的显著关联。对于李属品种，一个具有很强效应的主效 QTL 和另外五个具有较小效应的 QTL 位于不同的连锁群中。对于‘Summergrand’，也检测到了三个对白粉病抗性具有较小效应的 QTL。因此，这里有证据表明，李属品种 1908 克隆和桃品种‘Summergrand’的白粉病抗性不是一个单基因性状，而是由至少一个主基因和几个微效基因控制的。
