Dissolution and release of soil potassium by ectomycorrhizal fungi under Mn2+ stress

doi:10.3969/j.issn.1004-1524.2020.07.10

›› 2020, Vol. 32 ›› Issue (7): 1215-1222.DOI: 10.3969/j.issn.1004-1524.2020.07.10

• Environmental Science • Previous Articles Next Articles

Dissolution and release of soil potassium by ectomycorrhizal fungi under Mn²⁺ stress

ZHANG Liang¹, LI Yuting¹, XU Xiaofeng^1,2,*

1. School of Chemistry and Bioengineering, Nanjing Normal University Taizhou College, Taizhou 225300, China;
2. School of Life Sciences, Nanjing Normal University, Nanjing 210023, China

Received:2020-01-01 Online:2020-07-25 Published:2020-07-28

Abstract

Abstract: Ectomycorrhizal fungi (ECMF), important components in forest ecosystems, could participate in nutrient absorption and utilization. Pisolithus tinctorius(Pt) and Lactarius deliciosus(Ld) were cultured in liquid Pachlewsk medium with soil as the potassium (K) source under Mn²⁺ stress, to study the ability and mechanism of two strains to activate insoluble K. The results showed that the biomass of two strains decreased with the increase of Mn²⁺, and the growth was significantly (P<0.05) inhibited. The biomass of Pt was higher than Ld under all Mn²⁺ concentrations, indicating that the resistance to manganese toxicity of Pt was stronger than Ld. Oxalic acid and acetic acid were detected in the medium of ECMF. Two strains reduced mineral K, and increased exchangeable K in soil, indicating that the ECMF could activate the insoluble K in soil under Mn²⁺ stress. Correlation analysis showed that oxalic acid secretion was significantly (P<0.01) positively related to soil exchangeable K, and was significantly (P<0.05) negatively related to soil mineral K. Meantime, the pH in culture medium was significantly (P<0.01) negatively related to exchangeable K in soil. Therefore, the organic acids and hydrogen ions secreted by ECMF were beneficial to the activation of soil insoluble K, in which oxalic acid might play a key role. Due to the different secretion capacity of organic acids and hydrogen ions, the activation abilities of the two ECMF strains were different.

Key words: Mn²⁺, ectomycorrhizal fungi, yellowish red soil, potassium

CLC Number:

ZHANG Liang, LI Yuting, XU Xiaofeng. Dissolution and release of soil potassium by ectomycorrhizal fungi under Mn²⁺ stress[J]. , 2020, 32(7): 1215-1222.

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Dissolution and release of soil potassium by ectomycorrhizal fungi under Mn²⁺ stress

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