Dynamics of root-microbe interactions governing crop phosphorus acquisition after straw amendment

文献类型： 外文期刊

第一作者： Li, Hongliang

作者： Li, Hongliang;Zhu, Haitao;Xu, Sixin;Cai, Shumei;Zhang, Deshan;Zhu, Haitao;Xu, Sixin;Cai, Shumei;Zhang, Deshan;Li, Hongbo;Zhang, Yuqiang;Sulaiman, Alharbi Almwarai;Kuzyakov, Yakov;Kuzyakov, Yakov;Kuzyakov, Yakov;Rengel, Zed;Rengel, Zed;Zhang, Deshan

作者机构：

关键词： Root morphological traits; Root exudation; Microbial biomass turnover; Phosphate-solubilizing microorganisms; Nutrient fertilization and straw return; Crop P-use efficiency

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：9.7； 五年影响因子：10.2 ）

ISSN： 0038-0717

年卷期： 2023 年 181 卷

页码：

收录情况： SCI

摘要： Phosphorus (P) mobilization by microorganisms influences root morphological and exudation traits related to crop nutrient acquisition. However, the dynamics of root P acquisition strategies in response to P immobilization followed by release that accompany microbial growth and decay remain unclear. We evaluated root-microbe interactions governing P uptake by Brassica chinensis and Solanum lycopersicum grown for 56 days in low-P (10 mg P kg -1) and high-P (100 mg P kg-1) soil with or without straw addition. Straw addition increased the growth of bacteria and fungi (including microorganisms harbouring the phoD, phoC and pqqC genes) and enhanced the microbial P pool. The high microbial abundance 29 days after straw addition was associated with short roots and weak carboxylate exudation in B. chinensis and S. lycopersicum regardless of P fertilization. Phosphate-solubilizing microbes harbouring the phoD, phoC and pqqC genes together with microbial P release increased plant-available soil P, influencing variation in root P-acquisition strategies between the species. The high level of CaCl2-extractable P due to P release upon microbial decay and phosphate-solubilizing microorganisms was associated with short roots and weak carboxylate exudation in B. chinensis, but underpinned crop nutrient acquisition in low-P soil amended with straw after day 40. S. lycopersicum increased root elongation in response to mobilization of microbial P after day 44. The long roots coupled with the increased P availability due to microbial P release elicited large P acquisition by S. lycopersicum in straw-amended, low-P soil. By contrast, microbial abundance and microbially mediated P availability had little influence on root P-acquisition strategies in B. chinensis and S. lycopersicum in high-P, straw-amended soil. This study highlighted the importance of temporally varying root-microbe interactions in influencing crop P acquisition in low-P, straw-amended soil.

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