植物生殖质中的有害和适应性突变被保存到现状
Yong-Bi Fu1, Gregory W Peterson1, Carolee Horbach1
1Plant Gene Resources of Canada, Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK S7N 0X2, Canada.
基因库保存了数以百万计的植物生殖质加入,但长期存储会产生遗传成本. 这项研究表明,较长的储存时间和较少的再生增加了保存作物集合中的有害突变.
科学领域:
- 遗传学 遗传学 是一个
- 植物科学 植物科学
- 保护生物学 保护生物学
背景情况:
- 全球基因库为未来的粮食安全保护700多万种植物生殖质.
- 长期保存生殖质的遗传后果在很大程度上仍未得到量化.
- 了解突变动态对于有效的生殖质管理至关重要.
研究的目的:
- 研究保存作物集中的有害和适应性突变的程度和变异.
- 评估储存时间和再生周期对突变积累的影响.
- 评估与ex situ生殖质保护相关的遗传成本.
主要方法:
- 使用RNA-Seq技术分析突变概况.
- 研究了来自大麦,小麦,麦,大豆,玉米,拉帕和向日收藏的490个单独的植物.
- 在样本中量化了突变负担和适应性突变率.
主要成果:
- 有害突变范围从125 (玉米) 到83,695 (麦) 每个集合.
- 每个有害位点的平均样本智能突变负担为0.200.
- 早些时候获得的加入 (大豆,向日) 和更长的储存与更高的有害突变负载相关.
- 增加的生殖质再生周期减少了有害突变,增加了适应性突变.
结论:
- 长期的生殖质保护导致了显著的遗传成本,主要是通过有害突变的积累.
- 储存时间和再生频率是影响基因库突变动态的关键因素.
- 研究结果为优化生殖质管理和保护策略提供信息,以保持遗传完整性.
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