环境因素,发育基因和氧化压力决定了 Salicaceae 中种子寿命的物种间变异性
Xiaoyin Zhang1, Qin Ai1, Xiaojian Hu1
1Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
Plants (Basel, Switzerland)
|September 27, 2025
概括
Salicaceae 种类中的种子寿命各不相同,而干燥储存显示出差异. 分子机制,包括热冲击 (HSP) 和晚期胚胎生成丰富 (LEA) 基因,影响种子的寿命和氧化应激抵抗力.
科学领域:
- 植物生物学 植物生物学
- 种子科学种子科学
- 分子生态学分子生态学
背景情况:
- 种子的寿命对于植物的生存和保护至关重要,但其决定因素仍然不太清楚.
- Salicaceae 种类为研究种子老化提供了有价值的模型,因为它们的种子通常寿命短.
- 了解种子的寿命需要调查环境因素和潜在的分子机制.
研究的目的:
- 为了比较13种 Salicaceae 种子的寿命.
- 探索种子寿命,气候和分子因素之间的关系.
- 为了确定与玻璃状状态下的种子寿命相关的潜在分子标记物.
主要方法:
- 收集了来自不同地理位置的13种 Salicaceae 种子.
- 优化种子采集和收获后处理,以获得高质量的样本.
- 在各种条件下储存后评估种子生存能力,包括低温和干燥室储存.
- 分析了两种对比物种 (Populus davidiana和Populus euphratica) 的转录组数据,以确定差异表达的基因.
主要成果:
- 大多数物种的种子在冷保存或-20°C存储3年后保持活力.
- 干室储存显示了种子寿命 (P50) 从150天到1200多天的显著变化.
- 来自更温暖,更潮湿的气候的Populus物种在干燥储存中表现出比Salix物种更长的种子寿命.
- 转录组分析显示,在寿命较长的P. davidiana种子中,热冲击 (HSP) 和晚期胚生成丰富 (LEA) 基因的表达更高,而在寿命较短的P. euphratica种子中,WRKY转录因子更丰富.
结论:
- 在 Salicaceae 中,种子的寿命受环境来源和分子组成的影响.
- 与晚期成熟相关的基因,如HSP和LEA,与增加种子寿命有关.
- 与氧化压力相关的基因可能在确定种子在干燥,玻璃状状态中的寿命方面发挥关键作用.
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