在玉米中对新型病变模仿的遗传映射和预测表明了遗传背景,环境和表观症的定量影响
Alper Adak1, Seth C Murray2, Claudia Irene Calderón3,4
1Department of Soil and Crop Sciences, Texas A&M University, Agronomy Field Lab 110/111, College Station, TX, 77843, USA.
概括
研究人员在第7染色体上发现了一种新的玉米基因,与病变模仿发育有关. 这种特征是压力的标志,是遗传的,并且可以通过特定的遗传标记更好地预测,这表明表现和遗传背景影响其表达.
科学领域:
- 植物遗传学 植物遗传学
- 玉米育种 玉米育种 玉米育种
- 定量特征位置 (QTL) 分析分析.
背景情况:
- 在玉米 (Zea mays L.) 中的损伤模仿表现为叶子微斑,可能表明生物或非生物压力.
- 了解病变模仿的遗传性对于剖析它们在不同遗传背景的行为至关重要.
- 这项研究侧重于玉米中一种新的病变模仿现型.
研究的目的:
- 识别和描述与玉米中的病变模仿表型相关的新型遗传局部.
- 调查这种损伤模仿特征的遗传性和环境影响.
- 为了比较整个基因组标记物的预测能力与基因组预测标记物的子集.
主要方法:
- 在三个环境 (乔治亚州,德克萨斯州,威斯康星州) 中,对538个玉米重组杂交系 (RIL) 进行定量表型化.
- 全基因组关联研究 (GWAS) 以确定导致病变的基因位点.
- 应用基因组预测模型,使用全基因组标记物和选定标记物子集.
主要成果:
- 在第7染色体 (70.6 Mb) 上发现了一种新的病变模仿位点,在QTL间隔 (69.3-71.0 Mb) 内,解释了11-15%的表型变异.
- 病变模仿表型是遗传的 (基因组h2 = 0.91),但在各种环境中表现出过分的隔离.
- 小组标记物 (51) 提供了比全基因组标记物 (0.26-0.29) 更好的病变模仿预测 (0.56-0.66),尽管解释了更少的变异.
结论:
- 染色体7上的新位影响了玉米中的遗传性病变模仿现型.
- 表观症和遗传背景影响显著影响病变模仿表达,有助于跨越性隔离.
- 一个有针对性的基因组标记子集为这种特定的玉米病变模仿特征提供了卓越的预测准确性.
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