通过与蓝藻细菌的相互相互作用而改变的Sphagnum泥中硫的特异化
Elizabeth Herndon1, Jocelyn Richardson2, Alyssa A Carrell3
1Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA.
The New phytologist
|December 22, 2023
概括
泥炭和蓝藻形成了一种伙伴关系,交换营养物质. 蓝藻菌的殖民改变了硫 (S) 的丰富性,并在中形成,影响了泥炭地中的营养循环.
科学领域:
- 生物地质化学生物地质化学
- 植物与微生物的相互作用
- 泥炭地生态 泥炭地生态
背景情况:
- 泥炭 (Sphagnum spp.) 是一种在土壤中生长的植物. 与蓝藻细菌建立互惠关系.
- 这种共生涉及营养物质的交换,花提供碳水化合物和硫 (S) 化合物 (N) 丰富的化合物从蓝藻细菌.
- 这种相互作用可能会增强N输入到泥炭地生态系统.
研究的目的:
- 调查Nostoc muscorum殖民如何影响S丰富性和Sphagnum angustifolium的物种化.
- 分析S变化在细胞和整个叶片的尺度.
- 为了了解这种共生在泥炭地S循环中的作用.
主要方法:
- 首次利用SK边缘X射线吸收光谱 (XAS) 来分析S物种化.
- 在孤立的蓝藻菌群,殖民的叶子和未殖民的叶子中检查了批量和微米尺度的S物种化.
- 在被殖民和未被殖民的氨酸细胞中比较S物种化.
主要成果:
- 未殖民的叶子显示有机S减少和氧化硫酸盐/硫酸盐化合物.
- 诺斯托克殖民导致了S的丰富和改变的物种,与减少的S和硫酸盐相比,硫酸盐的增加.
- 殖民的氨酸细胞显示局部降低的S丰富度,周围环绕着分散的硫酸盐.
结论:
- 斯法gnum-Nostoc殖民刺激植物吸收S和生产硫酸盐代谢产物.
- 这些硫酸盐化合物集中在干细胞组织中,并且可以在被殖民细胞内的蓝藻细菌转化为减少的S.
- 这些发现揭示了泥炭地中的这种共生关系中复杂的S循环动态.
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