QTLs for Energy-related Traits in a Sweet x Grain Sorghum [Sorghum bicolor (L.) Moench] Mapping Population
QTLs for Energy-related Traits in a Sweet x Grain Sorghum [Sorghum bicolor (L.) Moench] Mapping Population
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DOI：
10.2135/cropsci2011.11.0618
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发表时间：
2012-09-01
期刊：
影响因子：
2.3
通讯作者：
Rooney, W. L.
中科院分区：
文献类型：
--
作者：
Felderhoff, T. J.;Murray, S. C.;Rooney, W. L.
为满足甜高粱[Sorghum biolor(L.)目前，甜高粱杂交种的开发正在进行中。由于这一发展还处于起步阶段，遗传标记将非常有助于确定产糖量构成因素的遗传基础，并减少向市场交付新杂交种所需的时间。本研究的目的是研究影响甜高粱产量和农艺性状的遗传因素。对籽粒×甜高粱作图群体的16个表型性状在4个环境中进行了评估。以甜高粱为亲本‘BTx3197’和‘Rio’为亲本，选育了185个F-3衍生的F-4(F-3：4)系。构建了381个单核苷酸多态性的遗传图谱，并进行了数量性状座位(QTL)分析。在第3号染色体上发现了一个先前报道的控制可溶性固形物的主要QTL，但与以往的研究不同，该QTL与其他对所需性状有负面影响的QTL共定位。因此，对该QTL的选择可能不是有利的。检测到数量有限的水分QTL，结果表明，茎干表型不影响本研究测得的水分含量。因此，育种水分含量将比之前预期的更具挑战性。锤度性状不存在显性效应，说明双亲锤度必须高，才能产生高锤度的杂种。
To meet anticipated markets for sweet sorghum [Sorghum bicolor (L.) Moench] production, the development of sweet sorghum hybrids is underway. As this development is in its infancy, genetic markers will be very useful to define the genetic basis of sugar yield components and reduce the time required to deliver new hybrids to market. The purpose of this research was to characterize genetic components that influence sweet sorghum productivity and agronomics. A grain x sweet sorghum mapping population was evaluated for 16 phenotypic traits across four environments. A population of 185 F-3-derived F-4 (F-3:4) lines was derived from the parents 'BTx3197' and 'Rio', which are dry-stalked grain and juicy-stalked sweet sorghums, respectively. A genetic map was constructed with 381 single nucleotide polymorphisms, and quantitative trait locus (QTL) analysis was performed. A major and previously reported QTL for soluble solids was identified on chromosome 3, but in contrast to previous studies, this QTL colocalized with other QTLs that had negative influences on desirable traits. Therefore, selection for this QTL may not be advantageous. A limited number of QTLs for percent moisture were found, and results indicated that the dry-stalk phenotype does not affect moisture content as measured in this study. Thus, breeding for moisture content will be more challenging than previously expected. The absence of dominance effects for the brix trait indicated that brix must be high in both parents to produce high brix in hybrids.