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首页> 外文期刊>Journal of genetics >QTL identification of grain protein concentration and its genetic correlation with starch concentration and grain weight using two populations in maize (Zea mays L.)
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QTL identification of grain protein concentration and its genetic correlation with starch concentration and grain weight using two populations in maize (Zea mays L.)

机译：利用玉米中两个种群的籽粒蛋白质浓度的QTL鉴定及其与淀粉浓度和粒重的遗传相关性

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摘要

Protein is one of the three main storage chemical components in maize grains, and is negatively correlated with starch concentration (SC). Our objective was to analyse the influence of genetic backgrounds on QTL detection for protein concentration (PC) and to reveal the molecular genetic associations between PC and both SC and grain weight (GWP). Two hundred and eighty-four (Pop1) and 265 (Pop2) F-2:3 families were developed from two crosses between one high-oil maize inbred GY220 and two normal maize inbreds 8984 and 8622 respectively, and were genotyped with 185 and 173 pairs of SSR markers. PC, SC and GWP were evaluated under two environments. Composite interval mapping (CIM) and multiple interval mapping (MIM) methods were used to detect single-trait QTL for PC, and multiple-trait QTL for PC with both SC and GWP. No common QTL were shared between the two populations for their four and one PC QTL. Common QTL with opposite signs of effects for PC and SC/GWP were detected on three marker intervals at bins 6.07-6.08, 8.03 and 8.03-8.04. Multiple-traits QTL mapping showed that tightly-linked QTL, pleiotropic QTL and QTL having effects with opposite directions for PC and SC/GWP were all observed in Pop1, while all QTL reflected opposite effects in Pop2.
机译：蛋白质是玉米籽粒中三种主要的存储化学成分之一，与淀粉浓度（SC）呈负相关。我们的目的是分析遗传背景对QTL检测蛋白质浓度（PC）的影响，并揭示PC与SC和谷物重量（GWP）之间的分子遗传关联。从一个高油玉米自交系GY220和两个正常玉米自交系8984和8622之间的两个杂交中发展了284个（Pop1）和265（Pop2）F-2：3家族，并分别进行了185和173基因分型对SSR标记。在两种环境下对PC，SC和GWP进行了评估。使用复合间隔映射（CIM）和多间隔映射（MIM）方法检测具有SC和GWP的PC的单性状QTL和PC的多性状QTL。两个群体的四个和一个PC QTL没有共享通用的QTL。在三个标记间隔上，分别在bin 6.07-6.08、8.03和8.03-8.04处检测到对PC和SC / GWP具有相反作用迹象的常见QTL。多性状QTL作图表明，在Pop1中观察到紧密连锁的QTL，多效性QTL和对PC和SC / GWP具有相反方向作用的QTL，而所有QTL在Pop2中均反映相反的作用。

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