AI Article Synopsis

  • This study explores how different below-ground strategies for acquiring phosphorus (P), such as root structure and fungal interactions, are coordinated, focusing on the relationship between root traits and arbuscular mycorrhizal fungi (AMF) in chickpeas.
  • Two chickpea types with different carboxylate levels were tested at various P concentrations, revealing that AMF presence influenced root growth and carboxylate levels differently depending on the P source (FePO vs. KH2PO4).
  • Findings suggest that AMF enhances P acquisition mainly from sparingly soluble sources (FeP) and affects shoot growth via cytokinin levels in the plant, indicating a complex interaction between roots, carboxylates, and AMF.

Article Abstract

The coordination/trade-off among below-ground strategies for phosphorus (P) acquisition, including root morphology, carboxylate exudation and colonisation by arbuscular mycorrhizal fungi (AMF), is not well understood. This is the first study investigating the relationships between root nodulation, morphology, carboxylates and colonisation by an indigenous community of AMF under varying P levels and source. Two chickpea genotypes with contrasting amounts of rhizosheath carboxylates were grown in pots at six P levels (from 0 to 160 μg g ) as KH PO (KP, highly soluble) or FePO (FeP, sparingly soluble), with or without AMF (±AMF) treatment. Under both FeP and KP, the presence of AMF inhibited shoot growth and shoot branching, decreased total root length and specific root length, increased mean root diameter and root tissue density and reduced carboxylates. However, the role of AMF in acquiring P differed between the two P sources, with the enhanced P acquisition under FeP while not under KP. Co-inoculation of AMF and rhizobia enhanced nodulation under FeP, but not under KP. Our results suggest that the effects of AMF on shoot branching were mediated by cytokinins as the reduced shoot branching in FeP40 and KP40 under +AMF relative to -AMF coincided with a decreased concentration of cytokinins in xylem sap for both genotypes.

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http://dx.doi.org/10.1111/ppl.13873DOI Listing

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