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Interactions between root and rhizosphere microbes mediate phosphorus acquisition in Pinus tabulaeformis

文献类型： 外文期刊

作者： Wang, Ying 1 ; Zhang, Min 1 ; Dong, Liguo 1 ; Zhang, Guoyu 1 ; Bai, Xiaoxiong 1 ; Wang, Jie 5 ; Li, Yan 1 ; Hu, Sile 1 ; Yu, Xuan 1 ;

作者机构： 1.Northwest A&F Univ, Coll Forestry, Dept Forestry, Yangling 712100, Shaanxi, Peoples R China

2.Key Comprehens Lab Forestry, Yangling 712100, Shaanxi, Peoples R China

3.Key Lab Silviculture Loess Plateau State Forestry, Yangling 712100, Peoples R China

4.Ningxia Acad Agr & Forestry Sci, Inst Forestry & Grassland Ecol, Yinchuan 750002, Peoples R China

5.Guizhou Univ, Inst Forest Resources & Environm Guizhou, Coll Forestry, Key Lab Forest Cultivat Plateau Mt Guizhou Prov, Guiyang 550025, Peoples R China

6.Northwest A&F Univ, Coll Forestry, Yangling 712100, Shaanxi, Peoples R China

关键词： Phosphorus acquisition; Phosphorus fractions; Root-microbe interactions; Synthetic microbial community; Pinus tabulaeformis

期刊名称：INDUSTRIAL CROPS AND PRODUCTS （ 影响因子：5.9； 五年影响因子：6.0 ）

ISSN： 0926-6690

年卷期： 2024 年 215 卷

页码：

收录情况： SCI

摘要： The Pinus tabulaeformis plantation is a major industrial forest in China. Phosphorus (P) deficiency seriously affected its growth and productivity. Root traits and rhizosphere microorganisms play essential roles in plant P acquisition. However, how root traits interact with microbial communities for P acquisition remains largely unclear. The responses of P. tabulaeformis root morphological characteristics, oxalic acid, soil P fractions and rhizosphere bacterial and fungal communities and potential functions to P addition were investigated using a pot experiment with three P levels (0, 20, and 80 mg P kg-1 soil). Additionally, we constructed a functional synthetic microbial community (SynCom) and verified their behaviors in promoting plant P acquisition and growth. P fertilization significantly increased the soil CaCl2-P, citrate-P, HCl-P and microbial biomass P (MBP) fractions and decreased oxalic acid, bacterial indicator genera in P deficiency and ectomycorrhizal fungi (ECM). Most of the bacterial indicator genera in P deficiency were negatively correlated with citrate-P and HCl-P but were positively correlated with alkaline phosphatase (ALP) and oxalic acid. According to structure equation models, soil total P could directly influence P acquisition efficiency and indirectly through its effects on ECM or by regulating oxalic acid, which regulated bacterial indicator genera in P deficiency and thus affected ALP production. Inoculation with SynCom significantly increased soil available P contents, ALP activities, root P concentrations and superoxide dismutase activities. Under low P conditions, P. tabulaeformis adopted a high carbon cost strategy for P acquisition, specifically moderating root secretion. Rhizosphere bacteria could accelerate soil P mobility and enhance the P absorption ability and systemic resistance of roots to alleviate P stress. This study provided the theoretical basis for the exploitation and utilization of microbial fertilizers, as well as for the cultivation and management of plantation.

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