文献类型： 外文期刊

作者： Ji, Chao ¹ ; Ge, Yuhan ⁵ ; Zhang, Hua ¹ ; Zhang, Yingxiang ¹ ; Xin, Zhiwen ¹ ; Li, Jian ⁶ ; Zheng, Jinghe ⁵ ; Liang, Zengwen ¹ ; Cao, Hui ¹ ; Li, Kun ³ ;

作者机构： 1.Weifang Univ, Coll Seed & Facil Agr Engn, Weifang, Peoples R China

2.Weifang Univ, Key Lab Biochem & Mol Biol Univ Shandong Prov, Weifang, Peoples R China

3.Shandong Agr Univ, Mt Tai Forest Ecosyst Res Stn, State Forestry & Grassland Adm, Tai An, Peoples R China

4.Shandong Agr Univ, Key Lab Silviculture Downstream Areas Yellow River, State Forestry & Grassland Adm, Tai An, Peoples R China

5.Weifang Univ, Coll Biol & Oceanog, Weifang, Peoples R China

6.Shandong Inst Pomol, Tai An, Peoples R China

7.Shandong Higher Educ Inst, Res Ctr Forest Carbon Neutral Engn, Tai An, Shandong, Peoples R China

8.Shandong Higher Educ Inst, Key Lab Ecol Protect & Secur Control Lower Yellow, Tai An, Shandong, Peoples R China

关键词： salt stress; nitrogen fertilization; halotolerant nitrogen-fixing bacteria; arbuscular mycorrhizal fungi; plant growth-promoting rhizobacteria

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.2； 五年影响因子：6.2 ）

ISSN：

年卷期： 2024 年 15 卷

页码：

收录情况： SCI

摘要： Background and aims Soil salinity negatively affects crop development. Halotolerant nitrogen-fixing bacteria (HNFB) and arbuscular mycorrhizal fungi (AMF) are essential microorganisms that enhance crop nutrient availability and salt tolerance in saline soils. Studying the impact of HNFB on AMF communities and using HNFB in biofertilizers can help in selecting the optimal HNFB-AMF combinations to improve crop productivity in saline soils. Methods We established three experimental groups comprising apple plants treated with low-nitrogen (0 mg N/kg, N0), normal-nitrogen (200 mg N/kg, N1), and high-nitrogen (300 mg N/kg, N2) fertilizer under salt stress without bacteria (CK, with the addition of 1,500 mL sterile water +2 g sterile diatomite), or with bacteria [BIO, with the addition of 1,500 mL sterile water +2 g mixed bacterial preparation (including Bacillus subtilis HG-15 and Bacillus velezensis JC-K3)]. Results HNFB inoculation significantly increased microbial biomass and the relative abundance of beta-glucosidase-related genes in the rhizosphere soil under identical nitrogen application levels (p < 0.05). High-nitrogen treatment significantly reduced AMF diversity and the relative abundance of beta-glucosidase, acid phosphatase, and urea-related genes. A two-way analysis of variance showed that combined nitrogen application and HNFB treatment could significantly affect soil physicochemical properties and rhizosphere AMF abundance (p < 0.05). Specifically, HNFB application resulted in a significantly higher relative abundance of Glomus-MO-G17-VTX00114 compared to that in the CK group at equal nitrogen levels. Conclusion The impact of HNFB on the AMF community in apple rhizospheres is influenced by soil nitrogen levels. The study reveals how varying nitrogen levels mediate the relationship between exogenous HNFB, soil properties, and rhizosphere microbes.