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Background <p>Changes in plant growth and root traits in wheat (<i>Triticum aestivum</i> L.) vary depending on the level of phosphorus (P) supply. Two important strategies for P acquisition in wheat are the release of carboxylates into the rhizosphere and the presence of arbuscular mycorrhizal fungi (AMF). However, the relationship between root exudates and P concentration in the shoot and root, as well as the role of AMF in this process, is not yet fully understood. This study was conducted utilizing three P supply rates (0, 50, and 200&#xa0;mg P kg<sup>−1</sup> soil) in conjunction with AMF inoculation. We examined the effects of AMF on amount of rhizosphere carboxylates and plant P uptake for nine P contrasting wheat genotypes.</p> Results <p>AMF decreased carboxylates, root biomass, root P content of wheat, and AMF reduced wheat root P allocation of wheat under all P levels. Notably, at 50&#xa0;mg kg<sup>−1</sup> P level, the shoot P concentration of AMF-inoculated wheat exceeded that of other P levels, having a positive mycorrhizal responsiveness in all wheat genotypes. Furthermore, analysis revealed that wheat root morphology and acid phosphatase activity significantly influenced mycorrhizal growth responsiveness, while root carboxylates played a significant role in mycorrhizal P responsiveness.</p> Conclusions <p>The P acquisition of wheat was found to be contingent upon the interplay of root morphology, AMF, and carboxylate levels, with AMF and carboxylate playing a more crucial role in enhancing P absorption. Consequently, the current research provides important insights for nutrient management in wheat agricultural cultivation.</p>

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The balance between rhizosphere carboxylates and arbuscular mycorrhizal symbiosis in wheat phosphorus acquisition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月6日

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  • Zitian Pu,
  • Ruifang Zhang,
  • Chi Zhang,
  • Hong Wang,
  • Xin-Xin Wang

摘要

Background

Changes in plant growth and root traits in wheat (Triticum aestivum L.) vary depending on the level of phosphorus (P) supply. Two important strategies for P acquisition in wheat are the release of carboxylates into the rhizosphere and the presence of arbuscular mycorrhizal fungi (AMF). However, the relationship between root exudates and P concentration in the shoot and root, as well as the role of AMF in this process, is not yet fully understood. This study was conducted utilizing three P supply rates (0, 50, and 200 mg P kg−1 soil) in conjunction with AMF inoculation. We examined the effects of AMF on amount of rhizosphere carboxylates and plant P uptake for nine P contrasting wheat genotypes.

Results

AMF decreased carboxylates, root biomass, root P content of wheat, and AMF reduced wheat root P allocation of wheat under all P levels. Notably, at 50 mg kg−1 P level, the shoot P concentration of AMF-inoculated wheat exceeded that of other P levels, having a positive mycorrhizal responsiveness in all wheat genotypes. Furthermore, analysis revealed that wheat root morphology and acid phosphatase activity significantly influenced mycorrhizal growth responsiveness, while root carboxylates played a significant role in mycorrhizal P responsiveness.

Conclusions

The P acquisition of wheat was found to be contingent upon the interplay of root morphology, AMF, and carboxylate levels, with AMF and carboxylate playing a more crucial role in enhancing P absorption. Consequently, the current research provides important insights for nutrient management in wheat agricultural cultivation.