Liu Y L, Wang L H, Li J Q, Zhan Q W, Zhang Q, Li J F, Fan F F
College of Agriculture, Anhui Science and Technology University, Fengyang, Anhui, China.
College of Agriculture, Anhui Science and Technology University, Fengyang, Anhui, China
Genet Mol Res. 2015 Apr 22;14(2):3854-61. doi: 10.4238/2015.April.22.14.
The sorghum-sudangrass hybrid (Sorghum bicolor x S. sudanense) is an important forage crop. However, little is known about the genetic mechanisms related to forage yield and the 4 forage yield component traits in this forage crop. In this study, a linkage map was constructed with 124 assigned SSR markers using an F2 mapping population derived from the crossing of sorghum Tx623A and sudangrass Sa. Nine quantitative trait loci (QTLs) were detected for forage yield and the 4 forage yield component traits using inclusive composite interval mapping. Five fresh weight QTLs were identified and contributed >50% of the total phenotypic variance. Of these QTLs, all showed additive and dominant effects, but most exhibited mainly dominant effects. These results will provide useful information for improvements in sorghum-sudangrass hybrid breeding.
高粱-苏丹草杂交种（高粱双色×苏丹草）是一种重要的饲料作物。然而，对于这种饲料作物中与饲料产量及4种饲料产量构成性状相关的遗传机制，人们了解甚少。在本研究中，利用高粱Tx623A与苏丹草Sa杂交产生的F2作图群体，构建了一张包含124个已定位SSR标记的连锁图谱。使用包容性复合区间作图法，检测到了9个与饲料产量及4种饲料产量构成性状相关的数量性状位点（QTL）。鉴定出了5个鲜重QTL，它们对总表型变异的贡献率超过50%。在这些QTL中，均表现出加性和显性效应，但大多数主要表现为显性效应。这些结果将为高粱-苏丹草杂交种育种的改良提供有用信息。
