Perennial sorghum cropping offers substantial economic and ecological benefits, conserving fuel, water, and soil. To be perennial in temperate climates, a sorghum plant must over-winter and produce new growth the following spring—a trait derived from the weedy species Sorghum halepense . We have introduced perenniality from S. halepense into a S. bicolor background and identified QTL affecting eight seed yield-related traits and their linkage relationships. Interval mapping in this BC 1 F 2 population derived from S. bicolor × S. halepense revealed a total of 80 QTL with LOD scores greater than 2.5 for the eight traits, with a range of 1 to 13 QTL per trait. Additional QTL were detected in multiple-QTL analyses. The traits mapped in this study showed diverse genetic complexity; the pattern of one major plus several minor QTL was observed for most traits, and traits varied in the number of QTL and direction of allelic effects. For four traits evaluated across locations, some QTL detected in one of the two locations had virtually no effect in the other, suggesting an environmental influence on QTL expression. The results contribute to fundamental knowledge of the genetic architecture underlying seed yield and may support development of high yielding perennial grain sorghum varieties.

中文翻译：

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在两个种间 S. bicolor2 × S. halepense 亚群中检测调节种子产量潜力的数量性状基因座

多年生高粱种植可提供显着的经济和生态效益，节约燃料、水和土壤。为了在温带气候下多年生，高粱植物必须越冬并在第二年春天产生新的生长——这一特性源自杂草物种 Sorghum halepense。我们将 S. halepense 的多年生性引入 S. bicolor 背景，并确定了影响 8 个种子产量相关性状及其连锁关系的 QTL。在这个源自 S. bicolor × S. halepense 的 BC 1 F 2 群体中的区间作图显示共有 80 个 QTL，八个性状的 LOD 分数大于 2.5，每个性状的范围为 1 到 13 个 QTL。在多 QTL 分析中检测到额外的 QTL。本研究中绘制的性状显示出不同的遗传复杂性；大部分性状呈现1主+数次QTL的格局，且性状在QTL数量和等位基因效应方向上存在差异。对于跨位置评估的四个性状，在两个位置之一检测到的一些 QTL 对另一个几乎没有影响，表明环境对 QTL 表达的影响。这些结果有助于了解种子产量背后的遗传结构，并可能支持高产多年生谷物高粱品种的开发。