在不同的盐度压力下对Taxodium mucronatum进行形态,生理和转录组分析
Yunpeng Gao1, Hongling Wang1, Shizheng Shi1
1Institute of Genetic Breeding, Jiangsu Academy of Forestry, Nanjing, Jiangsu, China.
Frontiers in plant science
|February 20, 2026
概括
塔克索迪木克罗纳 (Taxodium mucronatum) 的盐耐受性高达5 ‰的NaCl. 关键基因参与氧化还原酶活性和烯胺生物合成,以及像ERF,WRKY和NAC这样的转录因子,调解其适应透和氧化应激的适应策略.
科学领域:
- 植物生物学 植物生物学
- 分子生态学分子生态学
- 压力生理学 压力生理学
背景情况:
- 土壤盐度是全球农业的主要威胁,需要识别耐盐植物物种及其潜在的适应机制.
- 纳税 (Taxodium mucronatum) 是一种耐受性强的植林树种,以非生物应激抵抗力而闻名,但其对盐应激的分子反应在很大程度上仍未被描述.
研究的目的:
- 研究不同盐度条件下的Taxodium mucronatum幼苗的生理和转录基因适应.
- 确定关键的基因,转录因子和涉及T. mucronatum盐耐受性的分子途径.
主要方法:
- T. mucronatum 的幼苗暴露在不同的 NaCl 度 (0 ‰,3 ‰,5 ‰,7 ‰) 中.
- 分析了生理参数 (甲,相对导电性,氧化保护剂,抗氧化酶活性).
- 进行了转录组测序,基因本体学 (GO) 和基因和基因组的京都百科全书 (KEGG) 分析,权重基因联合表达网络分析 (WGCNA) 和差异表达基因 (DEG) 和枢纽基因的识别.
主要成果:
- 确定了5‰ NaCl的盐度值,超过该值后,会出现严重的叶子衰老和植物死亡.
- 盐应激诱导了与剂量相关的甲和相对导电性的增加,而 osmoprotectants (proline,可溶糖,可溶蛋白) 和抗氧化酶 (POD,CAT,SOD) 的增加.
- 转录基因分析显示3,858个DEG,富含氧化还原酶活性和烯胺生物合成. ERF,WRKY和NAC转录因子显著参与其中. 在WGCNA中,确定了关键模块和12个核心基因 (例如TCTP,ECI3,CYP73A4),这些基因对应激适应至关重要.
结论:
- 这项研究为Taxodium mucronatum的盐耐受机制提供了第一个全面的分子洞察力,突出了其管理离子和透应激的能力.
- 已确定的枢纽基因和途径为改善木质多年生植物的盐耐受性提供了有价值的目标.
- 这些发现支持T. mucronatum在盐环境中的生态恢复潜力.
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