Soil plant-available phosphorus levels and maize genotypes determine the phosphorus acquisition efficiency and contribution of mycorrhizal pathway

Qun Chu, Lin Zhang, Jianwei Zhou, Lixing Yuan, Fanjun Chen, Fusuo Zhang, Gu Feng, Zed Rengel

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Aims: Arbuscular mycorrhizal fungi play important roles in plant phosphorus (P) accumulation. The aim of this study was to uncover how and to what extent soil plant-available P levels and maize genotypes influence the contribution of mycorrhizal P uptake pathway to plant P nutrition. Methods: We selected an old genotype HMY and a modern genotype XY335, combined with 32P labeling and qPCR to quantify P uptake efficiency of the direct pathway (DP) and the mycorrhizal pathway (MP) at three Olsen-P levels: 4.5 (low), 8 (medium) and 50 (high) mg kg−1. Results: The P uptake efficiency ratio PAE-MP/PAE-DP was highest in the treatment with medium Olsen-P, and was correlated positively with MP contribution. The traits of arbuscular mycorrhizal fungi, such as percent colonization, hyphal length density, P uptake per unit hyphae length, and the expression of the mycorrhiza-specific P transporter ZmPT1;6 were higher in XY335 than HMY in high-P soil, which was in accordance with the importance of the MP contribution. Conclusions: Greater mycorrhizal responsiveness in the modern maize genotype than the old genotype under high P soil condition is related to higher P uptake efficiency of MP than DP; the inherent potential of MP can be maximized by managing soil plant P availability to achieve optimal P supply in intensive farming.

Original languageEnglish
Pages (from-to)357-371
Number of pages15
JournalPlant and Soil
Volume449
Issue number1-2
DOIs
Publication statusPublished - 1 Apr 2020

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