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Co-symbiosis of arbuscular mycorrhizal fungi (AMF) and diazotrophs promote biological nitrogen fixation in mangrove ecosystems
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2021-08-05 , DOI: 10.1016/j.soilbio.2021.108382
Huang Yu 1 , Xingyu Liu 1 , Chao Yang 1 , Yisheng Peng 1 , Xiaoli Yu 1 , Hang Gu 1 , Xiafei Zheng 1 , Cheng Wang 1 , Fanshu Xiao 1 , Longfei Shu 1 , Zhili He 1, 2 , Bo Wu 1 , Qingyun Yan 1
Affiliation  

Nitrogen (N) is the most critical nutrient that affects the establishment and stability of mangrove ecosystems. Despite the importance of biological nitrogen fixation (BNF) mediated by diazotrophs in mangrove ecosystems, current studies largely overlook the influence of arbuscular mycorrhizal fungi (AMF) on diazotrophs-driven BNF process in the N-limited ecosystems. Here, we conducted a comprehensive study on root-associated AMF and their interspecific interactions with diazotrophs in mangrove ecosystems using high throughput sequencing methods. Our results showed that the richness/diversity of diazotrophs had significant positive correlations with AMF community in mangrove rhizosphere. BNF rate in the rhizosphere of all mangrove species increased with the increasing of positive co-occurrence between AMF and diazotrophs, suggesting that the positive cooperation may promote N fixation efficiency in mangrove ecosystems. We also identified the potential keystone taxa (Zi ≥ 2.5 or Pi ≥ 0.62) and determined their crucial implications for the ecological processes of N fixation in mangrove ecosystems. The random forest analysis further indicated that the AMF keystone taxa were the most important predictors of BNF in mangrove rhizosphere. In addition, path analysis indicated that the α-diversity of AMF and diazotrophs communities, N-related enzymes and sediment nutrition components (e.g., TC, TN, Fe) were the main factors driving BNF process in mangrove ecosystems. This study provides novel insights into the interactions between AMF and diazotrophic communities during BNF process and expands our knowledge of AMF ecological functions of N cycle in mangrove ecosystems.



中文翻译:

丛枝菌根真菌(AMF)和固氮菌的共生促进红树林生态系统中的生物固氮

氮(N)是影响红树林生态系统建立和稳定的最关键的营养元素。尽管在红树林生态系统中由固氮菌介导的生物固氮 (BNF) 很重要,但目前的研究在很大程度上忽略了丛枝菌根真菌 (AMF) 对固氮菌驱动的 BNF 过程的影响。在这里,我们使用高通量测序方法对根相关的 AMF 及其与红树林生态系统中固氮菌的种间相互作用进行了全面研究。我们的结果表明,固氮菌的丰富度/多样性与红树林根际 AMF 群落呈显着正相关。所有红树树种根际 BNF 率随着 AMF 和固氮菌正共生的增加而增加,表明积极合作可能会提高红树林生态系统的固氮效率。我们还确定了潜在的关键类群(Zi  ≥ 2.5 或Pi  ≥ 0.62)并确定它们对红树林生态系统固氮生态过程的重要影响。随机森林分析进一步表明,AMF 基石类群是红树林根际 BNF 最重要的预测因子。此外,路径分析表明AMF和固氮菌群落的α多样性、N相关酶和沉积物营养成分(如TC、TN、Fe)是驱动红树林生态系统BNF过程的主要因素。这项研究为 BNF 过程中 AMF 与固氮群落之间的相互作用提供了新的见解,并扩展了我们对红树林生态系统中 N 循环的 AMF 生态功能的认识。

更新日期:2021-08-07
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