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玉米因其自身具有高产潜质而成为了当今世界最重要的粮食作物之一.玉米产量是复杂的数量性状,由许多主/微效基因控制,易受各种环境因素影响.果穗是玉米的主要收获器官,籽粒性状是玉米品质的重要体现,因此发掘玉米穗部性状和籽粒性状相关QTL对玉米的遗传改良,培育优质高产的玉米具有重要意义.本研究白刺包谷(P2)和妻染黄(P13)为亲本构建了包含152个家系的F_(2∶3)作图群体,选择在两亲本间具有多态性的176个微卫星标记构建遗传图谱,对产量相关性状进行了单环境的QTL定位与分析.最终定位到了14个QTL,分布在除9号染色体外的其余9条染色体上,单个QTL可解释的表型变异率为4.9%~18.8%.值得注意的是,在6号染色体上的百粒重和穗行数的一致性QTL(qHKW06-1和qERN06-1)与8号染色体上的穗行数QTL(qERN08-1)是本研究中特有的,其中qERN08-1解释了12.4%的表型变异率.
Corn is one of the most important food crops in the world due to its own high yield potential. Corn yield is a complex quantitative trait controlled by many major / minor genes that is susceptible to various environmental factors. Harvesting organs and grain traits are important manifestation of maize quality, therefore, it is of great significance to find out QTLs related to ear traits and grain traits to maize genetic improvement and cultivate high quality and high yield maize.In this study, (P13) was used to construct a population of F_ (2: 3) mapping population of 152 families. The genetic map was constructed by selecting 176 microsatellite markers with polymorphism between parents and the single-environment QTL mapping and analysis.Finally, 14 QTLs were mapped to the remaining 9 chromosomes except chromosome 9. The single-QTL explained a phenotypic variation rate of 4.9% ~ 18.8% .It is noteworthy that on the 6th QTL (QHKW06-1 and QERN06-1) and chromosome number QTL (QERN08-1) on chromosome 8 were consistent with the results of QERN08-1 The phenotypic variation rate of 12.4%.