Identification of QTLs and environmental interactions associated with agronomic traits on chromosome 3A of wheat
Identification of QTLs and environmental interactions associated with agronomic traits on chromosome 3A of wheat
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DOI：
10.2135/cropsci2003.1493
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发表时间：
2003-07-01
期刊：
影响因子：
2.3
通讯作者：
Yen, Y
中科院分区：
文献类型：
--
作者：
Campbell, BT;Baenziger, PS;Yen, Y
染色体替换系和重组自交染色体系 (RICL) 等独特的遗传工具的使用促进了小麦 (Triticum aestivum L.) 复杂性状的遗传分析，这些工具允许单独研究基因对单染色体的影响。已知“Wichita”的 3A 号染色体在数量性状基因座 (QTL) 上含有等位基因，与“Cheyenne”的等位基因相比，这些等位基因影响谷物产量和农艺性能性状的变异。为了确定 3A 染色体上与农艺性能相关的基因的数量、位置和环境相互作用，从 1999 年到 2001 年在内布拉斯加州的 7 个地点对 98 个 RICL-3A 进行了 QTL 和 QTL X 环境分析。在测量的 8 个农艺性状中检测到了 7 个 QTL，并且通常定位于 3A 染色体的三个区域。检测到一些 QTL 的 QTL X 环境相互作用，这些相互作用是由幅度和交叉相互作用的变化引起的。每平方米籽粒和谷物产量的主要 QTL 在 5 厘摩 (cM) 区间内相关，并且似乎代表具有多效性效应的单个 QTL。这个特定的QTL表现出由幅度变化引起的环境相互作用，其中威奇托QTL等位基因的积极作用在高产环境中更大。
Genetic analyses of complex traits in wheat (Triticum aestivum L.) are facilitated by the availability of unique genetic tools such as chromosome substitution lines and recombinant inbred chromosome lines (RICLs) which allow the effects of genes on single chromosomes to be studied individually. Chromosome 3A of 'Wichita' is known to contain alleles at quantitative trait loci (QTLs) that influence variation in grain yield and agronomic performance traits relative to alleles of 'Cheyenne'. To determine the number, location, and environmental interactions of genes related to agronomic performance on chromosome 3A, QTL and QTL X environment analyses of 98 RICLs-3A were conducted in seven locations across Nebraska from 1999 through 2001. QTLs were detected for seven of eight agronomic traits measured and generally localized to three regions of chromosome 3A. QTL X environment interactions were detected for some QTLs and these interactions were caused by changes in magnitude and crossover interactions. Major QTLs for kernels per square meter and grain yield were associated within a 5-centimorgan (cM) interval and appeared to represent a single QTL with pleiotropic effects. This particular QTL displayed environmental interactions caused by changes in magnitude, wherein the positive effect of the Wichita QTL allele was larger in higher yielding environments.