甘蓝型油菜（Brassica napus L．）RIL群体抗倒伏及其相关性状的QTL分析

油菜倒伏严重影响了油菜的产量和品质，为了定位甘蓝型油菜（Brassica napus L．）与抗倒伏性状相关的QTL，用抗倒伏品系浙平1号和易倒伏品系高芥1号组合重组自交系（RIL）家系为材料，通过两年两点试验，对该RIL群体的F2：6和F2：7，家系抗压力性状进行了QTL分析，并应用一年两点数据对该群体F2：6。家系结角层性状进行了QTL分析。结果表明，在4个试验中共检测到11个家系抗压力QTL，可解释4．41％～52．64％的表型变异，LOD值范围是2．68～26．58。其中qRP16-1可以在3个不同的试验中（南京-2012、溧水-2012和南京-2013）重复检测到，面P1、qRP4和qRP8-1同时在2个不同的试验中（溧水-2012和溧水-2013）重复检测到。qRP2-1、qRP2-2、qRP8-2、qRP8—3、qRPl6—2、qRP3和qRP8—4等7个QrL只能在特定的试验中检测到。同一地点不同年份间家系抗压力性状QTL相对同一年份不同地点间易被重复检测到。在2个试验中共检测到2个结角层厚度QTL，位于第15连锁群的qTPLl5在2个试验中重复检测到。

QTL mapping for lodging resistance and its related traits by RIL population of Brassica napus L.

Lodging causes yield loss and quality deficiency severely in oilseed rape. To mapping QTLs related to lodging resistance, 243 lines of a recombinant inbred line （RIL） population （ F2：6 and F2：7 ） of Brassica napus L. were tested at two locations in two consecutive years. The RIL population was derived from Zheping 1 （lodging resistant） x Gaojie 1 （lodging susceptible）. Results showed 11 QTLs for plant pressure resistance （PPR） using inclusive composite interval mapping from 4 trials. Their phenotype variation and LOD value ranges were 4.41% - 52.64% and 2.68 -26.58 respectively. Among QTLs, qRPI6 -1 was co -localized by 3 trials （Nanjing- 2012, Lishui - 2012 and Lishui - 2013 ）. qRP1, qRP4 and qRP8 - 1 were co - localized by 2 trials （ Lishui - 2012 and Lishui-2013）. And qRP2- 1, qRP2-2, qRP8-2, qRP8-3, qRP16-2, qRP3 and qRP8-4 were only local- ized by one trial. QTLs for PPR were co -localized more easily at single location in each year than those in single year at each location. Two QTLs for thickness of pod - set layer were identified from 2 trials, qTPL15 which on LG15 was eo -localized by 2 trials.