Winterhardiness in cereals is the consequence of a number of complex and interacting componentscold tolerance, vernalization requirement and photoperiod sensitivity. An understanding of the genetic basis of these component traits should allow for more effective selection. Genome map-based analyses hold considerable promise for dissecting complex phenotypes. A 74-point linkage map was developed from one hundred double haploid lines derived from a winter x spring barley cross and used as the basis for quantitative trait locus (QTL) analyses to determine the chromosome location of genes controlling components of winterhardiness. Despite the greater genome coverage provided by the current map, a previously-reported interval on chromosome 7 remains the only region where significant QTL effects for winter survival were detected in this population. QTLs for heading date under 24 h light map to the same region. A QTL for heading date under this photoperiod regime also maps to chromosome 2. A distinct set of QTLs mapping to chromosomes 1, 2, 3 and 5 determined heading date under 8 h light. Patterns of differential QTL expression underscore the complexity of Winterhardiness.

译文

谷物的耐寒性是许多复杂且相互作用的成分的结果,包括耐寒性,春化要求和光周期敏感性。对这些成分性状的遗传基础的了解应有助于更有效的选择。基于基因组图谱的分析在解剖复杂表型方面具有广阔的前景。用一百个来自冬季x春季大麦杂交的双单倍体系构建了74点连锁图谱,并将其用作定量性状基因座(QTL)分析的基础,以确定控制耐寒性成分的基因的染色体位置。尽管当前图谱提供了更大的基因组覆盖范围,但先前在7号染色体上报告的间隔仍然是在该种群中检测到对冬季存活具有显着QTL影响的唯一区域。在24小时光照下朝向日期的QTL映射到同一区域。在此光周期条件下,抽穗期的QTL也映射到染色体2。在8 h光照下,映射到染色体1、2、3和5的一组独特的QTL确定了抽穗期。 QTL差异表达模式强调了耐寒性的复杂性。

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