大白菜部分形态性状的QTL定位与分析

应用352个标记位点的大白菜AFLP和RAPD图谱和一套栽培品种间杂交获得的重组自交系群体，采用复合区间作图的方法对大白菜9个形态性状进行QTL定位及遗传效应研究。在14个连锁群上检测到50个QTL:其中控制株型的QTL有5个；控制株高的QTL有6个；控制开展度的QTL有5个；控制最大叶长的QTL有7个；控制最大叶宽的QTL有4个；控制叶形指数的QTL有6个；控制中肋长的QTL有7个；控制中肋宽的QTL有4个；控制抽苔的QTL有6个。另外，估算了单个QTL的遗传贡献率和加性效应。这将为大白菜品种改良中形态性状的分子标记辅助选择提供理论依据。

Mapping and Analysis QTL Controlling Some Morphological Traits in Chinese Cabbage (Brassica campestris L.ssp.pekinensis)

An AFLP and RAPD genetic map with 352 markers and a RIL (recombinant inbred lines) population from the cross of two cultivated Chinese cabbage lines were employed in mapping and analysis quantitative trait loci (QTL).The number,location,variation explained and additive effect of QTL underlying nine morphological traits were determined by using composite interval mapping method.Fifty putative QTL,including five for plant growth habit,six for plant height,five for plant diameter,seven for leaf length,four for leaf width,six for leaf length/leaf width ratio,seven for petiole length,four for petiole width and six for bolting character,were mapped on 14 linkage groups.There were unequal gene effects and unequal variation explained on the expression of many morphological traits.These results are fundamentals for molecular assisted selection of morphological traits in Chinese cabbage breeding.