与地被菊株型匍匐性连锁RAPD标记的SCAR转化

In this study,PCR product amplified with a RAPD marker A10555 which is linked to gene controlling creeping habit of ground-cover chrysanthemum（Dendranthema grandiflorum） was recovered,and subsequently subcloned and sequenced. A pair of 18-base specific primers was designed based on the obtained sequence.The validity of this SCAR marker was verified by screening parents and 152 individuals of the F1 progeny,and the consistence in the locus of the special band and the number of recombinants was observed between SCAR analysis and RAPD analysis. The size of this SCAR marker was 555 bp,which was designated as SCA10555. The results demonstrated that the RAPD marker was converted to SCAR marker successfully. This study provides bases for new cultivars developing,molecular markers assisted breeding and creeping habit related genes cloning of the ground-cover chrysanthemum.

地被菊匍匐性的遗传分析与RAPD标记研究

【目的】探讨地被菊株型匍匐性的遗传控制,并寻找与匍匐性连锁的RAPD标记,为匍匐型地被菊新品种选育、分子标记辅助育种和匍匐性相关基因的克隆奠定基础。【方法】以盆栽小菊品种‘早意大利红’为母本,地被菊品种‘03(6)-12’为父本构建F1群体,从F1中选取株型表现为匍匐、直立和中间型的单株各1株,分别自交,构建F2群体,并以选取的3个类型F1单株为母本与‘03(6)-12’回交,构建BC1群体。以主枝分枝角度作为株型划分依据,统计每个群体中不同株型分离比,推测地被菊株型控制相关基因特点。此外,以F1分离群体为试材,采用集团分离分析法(bulkedsegregantanalysis,BSA)构建株型匍匐/直立基因池,利用200个RAPD随机引物筛选与地被菊匍匐基因相连锁的分子标记。【结果】通过遗传分析和χ2检验表明,地被菊匍匐/直立特性由1对不完全显性主效基因控制,同时存在微效修饰基因。筛选出1个与地被菊匍匐性状控制基因相连锁的分子标记A-10555。经过重复性验证和群体单株验证,该标记与地被菊株型匍匐/直立位点遗传距离为7.96cM。【结论】以主枝分枝角度作为株型的划分标准是可行的,通过F1、F2和BC1分离群体能对地被菊株型控制位点进行有效分析。获得的分子标记与株型匍匐/直立位点的遗传距离小,能用于辅助育种。