交叉对玉米和小麦种群遗传变异的贡献
1Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota, USA.
The plant genome
|January 8, 2025
概括
跨越,一个关键的遗传过程,往往减少了玉米和小麦育种的整体遗传变异 (VG). 然而,罕见的有利交叉仍然可以产生优秀的线条,这对未来的育种进步至关重要.
科学领域:
- 植物遗传学和育种.
- 定量遗传学 是一种定量遗传学.
背景情况:
- 交叉产生新的等位基因组合,这是遗传学的基本概念.
- 它对作物育种,特别是玉米和小麦的遗传变异 (VG) 的精确影响需要详细评估.
研究的目的:
- 量化交叉对玉米 (Zea mays L.) 和小麦 (Triticum aestivum L.) 的遗传变异 (VG) 的贡献.
- 评估交叉对不同种群和特征的繁殖潜力的净影响.
主要方法:
- 通过对每个染色体的标记效应进行总和,计算VG而不会交叉.
- 估计VG与交叉使用模拟的双倍的平分体衍生自变.
- 评估了VG (PCO) 交叉对玉米和小麦各种特征的贡献.
主要成果:
- 过渡对玉米的VG产生了混合的影响,在两个种群中产生了积极的贡献 (7%,16%),但在其他五种种群中显著下降 (-74%至-25%).
- 对于玉米的湿度,测试重量,植物高度和耳高度,负PCO值是普遍存在的.
- 小麦种群显示出对比的结果:一个种群的5个特征是负的PCO,另一个种群的3个特征是正的.
- 负的PCO与父母同类物之间的实质性等位基效应差异有关.
结论:
- 虽然越过频繁减少整体VG,罕见的有利的交叉可以产生优越的线路.
- 识别这些有益的交叉对推进玉米和小麦的育种计划至关重要.
- 育种策略必须考虑到交叉品的主要不利,但潜在的高价值性质.
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