大麦旗叶生理和形态性状相关数量性状位点的鉴定
Identification of QTL underlying physiological and morphological traits of flag leaf in barley.
作者信息
Liu Lipan, Sun Genlou, Ren Xifeng, Li Chengdao, Sun Dongfa
机构信息
College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China.
Biology Department, Saint Mary's University, 923 Robie Street, Halifax, NS, B3H 3C3, Canada.
出版信息
BMC Genet. 2015 Mar 20;16:29. doi: 10.1186/s12863-015-0187-y.
BACKGROUND
Physiological and morphological traits of flag leaf play important roles in determining crop grain yield and biomass. In order to understand genetic basis controlling physiological and morphological traits of flag leaf, a double haploid (DH) population derived from the cross of Huaai 11 × Huadamai 6 was used to detect quantitative trait locus (QTL) underlying 7 physiological and 3 morphological traits at the pre-filling stage in year 2012 and 2013.
RESULTS
Total of 38 QTLs distributed on chromosome 1H, 2H, 3H, 4H, 6H and 7H were detected, and explained 6.53% - 31.29% phenotypic variation. The QTLs flanked by marker Bmag829 and GBM1218 on chromosome 2H were associated with net photosynthetic rate (Pn), stomatal conductance (Gs), flag leaf area (LA), flag leaf length (FLL), flag leaf width (FLW), relative chlorophyll content (SPD) and leaf nitrogen concentration (LNC).
CONCLUSION
Two QTL cluster regions associated with physiological and morphological traits, one each on the chromosome 2H and 7H, were observed. The two markers (Bmag829 and GBM1218) may be useful for marker assisted selection (MAS) in barley breeding.
背景
旗叶的生理和形态特征在决定作物籽粒产量和生物量方面起着重要作用。为了解控制旗叶生理和形态特征的遗传基础，利用淮麦11×华大麦6杂交衍生的双单倍体（DH）群体，在2012年和2013年灌浆前期检测了7个生理性状和3个形态性状的数量性状位点（QTL）。
结果
共检测到38个QTL，分布在1H、2H、3H、4H、6H和7H染色体上，解释了6.53%-31.29%的表型变异。位于2H染色体上标记Bmag829和GBM1218两侧的QTL与净光合速率（Pn）、气孔导度（Gs）、旗叶面积（LA）、旗叶长度（FLL）、旗叶宽度（FLW）、相对叶绿素含量（SPD）和叶片氮浓度（LNC）相关。
结论
观察到两个与生理和形态特征相关的QTL簇区域，分别位于2H和7H染色体上。这两个标记（Bmag829和GBM1218）可能有助于大麦育种中的标记辅助选择（MAS）。
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