在大米树叶圈和土壤之间减少铁和减少铁的细菌的空间异质性提高了土壤的生物利用性
Chenhao Lyu1,2,3, Jieyu Gao4, Yan Hu5
1State Key Laboratory of Lake and Watershed Science for Water Security, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.
Journal of agricultural and food chemistry
|January 13, 2026
概括
(Se) 在大米土壤中的转化对植物吸收至关重要. 微生物铁和硫酸盐减少剂驱动Se的释放和减少,影响其在土壤植物系统中的生物利用性.
科学领域:
- 土壤科学 土壤科学
- 环境微生物学 环境微生物学
- 生物地质化学生物地质化学
背景情况:
- 土壤中的 (Se) 转化决定了其生物利用率和植物吸收.
- 微生物在根球中的Se转化中的作用尚不清楚.
研究的目的:
- 研究Se在水根球中的空间分布.
- 阐明控制Se转化和生物可用性的微生物机制.
主要方法:
- 在米根球中Se分布的空间分析.
- 识别微生物种类和参与Se转换的功能基因 (铁还原,Se还原).
主要成果:
- 铁的生物可用性受到铁结合的释放 (通过减少铁的细菌) 和减少的影响.
- 携带*dsr*基因的硫酸盐减少细菌是Se减少的关键媒介.
- 异质基因分布导致根球和土壤之间多种多样的Se释放和减少.
- 由于铁结合的Se释放量增加和减少Se (IV) 减少,球Se的生物利用性得到增强.
结论:
- 微生物过程,特别是铁和硫酸盐的降解,显著控制了米根球中的Se转化.
- 了解这些微生物机制为提高Se在农业系统中的生物利用性提供了洞察力.
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