Quantitative trait loci associated with seed and seedling traits in Lactuca
Quantitative trait loci associated with seed and seedling traits in Lactuca
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DOI：
10.1007/s00122-005-0066-4
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发表时间：
2005-11-01
影响因子：
5.4
通讯作者：
Bradford, KJ
中科院分区：
文献类型：
--
作者：
Argyris, J;Truco, MJ;Bradford, KJ
生菜种子和幼苗性状是影响生菜种子萌发和定植的重要性状。6个种子和幼苗性状的分离。青花菜萨利纳斯湖在由103个F8家系组成的重组自交系群体中，共检测到17个显著的数量性状位点（QTL）。显着的QTL被确定为发芽在黑暗中，发芽在25和35摄氏度，发芽的最高温度，下胚轴长度在吸胀后72小时，和植物（幼苗）质量。一些发芽和早期幼苗生长特性的QTL共定位，暗示多效基因座调控这些性状。单个QTL（Htg 6.1）分别描述了加州和荷兰种植群体中高温发芽总表型变异的25%和23%，并且在33和37摄氏度之间是显著的。此外，Htg6.1与其他Htg QTL表现出显著的上位性互作，并且在所有三种种子生产环境中具有一致的效应。L. serriola等位基因在这些QTL上增加发芽。Htg6.1的狭义遗传力（h（2））估计值为0.84，表明该基因具有推广应用的潜力。serriola作为莴苣渗入程序的萌发耐热性的来源。
Seed and seedling traits related to germination and stand establishment are important in the production of cultivated lettuce (Lactuca sativa L.). Six seed and seedling traits segregating in a L. sativa cv. Salinas x L. serriola recombinant inbred line population consisting of 103 F8 families revealed a total of 17 significant quantitative trait loci (QTL) resulting from three seed production environments. Significant QTL were identified for germination in darkness, germination at 25 and 35 degrees C, median maximum temperature of germination, hypocotyl length at 72 h post-imbibition, and plant (seedling) quality. Some QTL for germination and early seedling growth characteristics were co-located, suggestive of pleiotropic loci regulating these traits. A single QTL (Htg6.1) described 25 and 23% of the total phenotypic variation for high temperature germination in California- and Netherlands-grown populations, respectively, and was significant between 33 and 37 degrees C. Additionally, Htg6.1 showed significant epistatic interactions with other Htg QTL and a consistent effect across all the three seed production environments. L. serriola alleles increased germination at these QTL. The estimate of narrow-sense heritability (h(2)) of Htg6.1 was 0.84, indicating potential for L. serriola as a source of germination thermotolerance for lettuce introgression programs.