相关实验视频

Updated: Jun 12, 2025

Methods for Performing Crosses in Setaria viridis, a New Model System for the Grasses

Methods for Performing Crosses in Setaria viridis, a New Model System for the Grasses

Published on: October 1, 2013

使用模拟和实验数据验证交叉后代变异基因组预测,在冬季精英面包小麦中的实验数据

Claire Oget-Ebrad¹, Emmanuel Heumez², Laure Duchalais³

¹UMR1095, GDEC, INRAE-Université Clermont-Auvergne, Clermont-Ferrand, France.

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik

|September 18, 2024

概括

植物育种中交叉后代变异的基因组预测可能是准确的,但取决于特征复杂性和后代大小. 这项研究引入了一种新的公式,以改善预测,特别是对于具有低遗传性的复杂特征.

科学领域:

植物育种和遗传学植物育种和遗传学
定量遗传学是一种定量遗传学.
基因组预测基因组预测

背景情况:

在植物育种中,基因组预测对于选择优越的父母和交叉来说至关重要.
实用性标准 (UC) 是交叉选择的关键指标,依赖于父母平均值 (PM) 和后代标准偏差 (SD) 估计.
了解影响UC预测能力的因素对于优化育种计划至关重要.

研究的目的:

用模拟来评估影响有用性标准 (UC) 和其组件 (PM和SD) 的预测能力的参数.
将基因组预测模型与SD估计的新代数公式进行比较.
实验验证关键农业特征UC的基因组预测.

主要方法:

进行了模拟,以评估遗传性,后代大小和定量特征位点 (QTL) 数量对预测能力的影响.
开发了SD估计的新代数公式,将不确定性纳入标记效应估计中.
用标题日期,植物高度,谷物蛋白质含量和产量的实验数据来比较估计和观察到的UC.

主要成果:

UC及其组件的预测能力受到遗传性,后代大小和QTL数量的影响,SD对QTL数量特别敏感.
提出的SD估计公式在QTL数量超过300时改善了预测,特别是在低遗传性条件下.
实验验证显示,所有测试特征的估计和观察到的PM和UC之间存在显著的相关性,而SD相关性仅在标题日期和植物高度上观察到.

结论:

对交叉后代变异 (UC) 的基因组预测经过实验验证,但其准确性取决于特征架构和标记效应估计的精度.
足够的后代大小对于在现场条件下可靠的SD估计至关重要.
植物育种者应该优化后代的大小,以最大限度地发挥基因组预测对交叉选择的潜力.

更多相关视频

Development of Targeting Induced Local Lesions IN Genomes TILLING Populations in Small Grain Crops by Ethyl Methanesulfonate Mutagenesis

Development of Targeting Induced Local Lesions IN Genomes TILLING Populations in Small Grain Crops by Ethyl Methanesulfonate Mutagenesis

Published on: July 16, 2019

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Published on: November 6, 2016

相关概念视频

Dihybrid Crosses

Dihybrid Crosses

Punnett Squares

Punnett Squares

Heritability

Heritability

Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...

Genetic Variation

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...

Chi-square Analysis

Chi-square Analysis

The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an observed value. In the context of genetics, it enables us to either accept or reject a hypothesis, based on how much the observed values deviate from the expected values.
The chi-square test was developed by Pearson in 1990.
The first step of performing a Chi-square analysis is to establish a null hypothesis, which assumes that there is no real...

Trihybrid Crosses

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal...