Genetic maps and marker effects of four maize biparental crosses

This dataset includes genetic maps from four maize biparental crosses (A/B, C/B, C/D, and E/F) and marker effects for five traits: grain yield (t ha⁻¹ at 150 g H₂O kg⁻¹), grain moisture (g kg⁻¹), test weight (g L⁻¹), plant height (cm), and ear height (cm). Marker effects were estimated separately for two testers per population. Testers are designated as T1, T2, T3, and T4.
, Four maize biparental crosses (A/B, C/B, C/D, E/F) with 130 to 242 doubled haploid (DH) lines were crossed to two inbred testers, which were designated as T1, T2, T3, and T4. The eight testcross populations were evaluated in up to 18 year-location combinations in the U.S. Corn Belt. The measured traits included grain yield (t ha-1 at 150 g H2O kg-1), grain moisture (g kg-1), test weight (g L-1), plant height (cm), and ear height (cm). Testcross phenotypic data were adjusted according to the incomplete block design used at each location to obtain best linear unbiased estimates (BLUEs) per location. Across-environment BLUEs were subsequently calculated. Variance components were estimated with testcross and environment effects treated as random.
The DNA marker data consisted of 3072 single nucleotide polymorphisms (SNPs) generated using the Illumina iScan platform (Illumina Inc., San Diego, CA). Within each population, SNPs with > 10 % missing values, > 5 % of heterozygosity, or mino..., # Dryad dataset

Dataset DOI: [10.5061/dryad.pk0p2nh3g](https://doi.org/10.5061/dryad.pk0p2nh3g)

## Description of the data and file structure

This dataset contains genetic maps and tester-specific marker effect estimates for four maize biparental populations: A×B, C×B, C×D, and E×F.

A full description of the populations and field data processing methods can be found in Krchov et al. (2015): [https://doi.org/10.2135/cropsci2014.09.0608](https://doi.org/10.2135/cropsci2014.09.0608).

### Files and variables

##### **1. Genetic Maps**

Each population has an associated genetic map file. Each genetic map includes the following columns:

* SNP – Marker name
* CHR – Chromosome number
* POS – Marker position in centimorgans (cM)

**2. Marker Effects**

Marker effects were estimated separately for two testers within each biparental population. Tester were designated as T1, T2, T3, and T4.

Each marker-effect file contains the following columns:

* SNP – Marker name
* YLD – Grain yield (t ha...,

本数据集包含来自4个玉米双亲杂交群体（A/B、C/B、C/D及E/F）的遗传图谱，以及5个性状的标记效应值：籽粒产量（150g H₂O kg⁻¹时的t ha⁻¹）、籽粒含水量（g kg⁻¹）、容重（g L⁻¹）、株高（cm）及穗位高（cm）。针对每个群体的2个测验种分别估算标记效应值，测验种编号为T1、T2、T3及T4。

4个玉米双亲杂交群体（A/B、C/B、C/D、E/F）各包含130至242个双单倍体（DH）系，分别与编号为T1、T2、T3、T4的2个近交测验种杂交，得到8个测交群体。这些测交群体在美国玉米带的多达18个年-地点组合中开展表型鉴定。所测定的性状包括籽粒产量（150g H₂O kg⁻¹时的t ha⁻¹）、籽粒含水量（g kg⁻¹）、容重（g L⁻¹）、株高（cm）及穗位高（cm）。根据每个试验点采用的不完全区组设计对测交表型数据进行校正，以获得每个试验点的最佳线性无偏估计（BLUEs），随后计算跨环境BLUE值。将测交效应与环境效应视为随机效应，估算方差组分。

DNA标记数据包含3072个单核苷酸多态性（SNPs），采用Illumina iScan平台（美国加利福尼亚州圣地亚哥Illumina公司）进行分型。在每个群体内，去除缺失值占比＞10%、杂合度＞5%或（原文未完整）的SNP标记。
# Dryad数据集
数据集DOI：[10.5061/dryad.pk0p2nh3g](https://doi.org/10.5061/dryad.pk0p2nh3g)

## 数据与文件结构说明
本数据集包含4个玉米双亲子群体（A×B、C×B、C×D及E×F）的遗传图谱及测验种特异性标记效应估算值。

关于群体及田间数据处理方法的完整描述可参见Krchov等（2015）的研究：[https://doi.org/10.2135/cropsci2014.09.0608](https://doi.org/10.2135/cropsci2014.09.0608)。

### 文件与变量
##### 1. 遗传图谱
每个群体对应一份遗传图谱文件，每份遗传图谱包含以下列：
* SNP：标记名称
* CHR：染色体编号
* POS：以厘摩（cM）为单位的标记位置

**2. 标记效应**
针对每个双亲子群体内的2个测验种分别估算标记效应值，测验种编号为T1、T2、T3及T4。
每份标记效应文件包含以下列：
* SNP：标记名称
* YLD：籽粒产量（t ha⁻¹，原文未完整）...