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Aims <p>Zinc (Zn) deficiency affects plant growth and human health. Plant growth-promoting bacteria (PGPB) have the potential to biofortify Zn nutrition of plants, but their inoculation effects are heterogeneous.</p> Methods <p>A meta-analysis was conducted of articles published between 2000 and 2023 describing Zn contents or yields in rice, wheat and maize.</p> Results <p>After PGPB inoculation, grain Zn and yield increased by 18% and 16%. In detail, inoculation effect was significantly better at low latitudes than at mid-latitudes. Within the ranges examined in this study, the inoculation effect on Zn biofortification was enhanced under conditions with pH ranging from 5.2 to 7.0, available Zn from 1.02 to 4.33&#xa0;mg/kg, or soil organic matter from 1.17% to 1.90%. Of three crops, inoculation showed a better effect on rice than on wheat and maize. Inoculation effect of endophytic bacteria was better than that of soil-derived bacteria. Notably, only <i>Bacillus</i> and <i>Pseudomonas</i> genera could simultaneously increase grain Zn content (13%-15%) and grain yield (16%-21%).</p> Conclusions <p>Up to the year of data collection, this is the first study to summarize all available data on Zn biofortification of PGPB-inoculated Poaceae plants and to identify influencing factors. It provides a research basis for future studies on how various microorganisms promote uptake of other nutrients by additional plants.</p> Graphical Abstract <p></p>

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Determinants of the variability of PGPB effects on zinc biofortification and crop yield: a meta-analysis

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Hua He,
  • Lu Peng,
  • Jinzhi Liu,
  • Fangchi Yang,
  • Xiu Li,
  • Qin Lan,
  • Xiaoyan Tang,
  • Yanyan Zhang,
  • Bing Li,
  • Changquan Wang,
  • Yingjie Wu

摘要

Aims

Zinc (Zn) deficiency affects plant growth and human health. Plant growth-promoting bacteria (PGPB) have the potential to biofortify Zn nutrition of plants, but their inoculation effects are heterogeneous.

Methods

A meta-analysis was conducted of articles published between 2000 and 2023 describing Zn contents or yields in rice, wheat and maize.

Results

After PGPB inoculation, grain Zn and yield increased by 18% and 16%. In detail, inoculation effect was significantly better at low latitudes than at mid-latitudes. Within the ranges examined in this study, the inoculation effect on Zn biofortification was enhanced under conditions with pH ranging from 5.2 to 7.0, available Zn from 1.02 to 4.33 mg/kg, or soil organic matter from 1.17% to 1.90%. Of three crops, inoculation showed a better effect on rice than on wheat and maize. Inoculation effect of endophytic bacteria was better than that of soil-derived bacteria. Notably, only Bacillus and Pseudomonas genera could simultaneously increase grain Zn content (13%-15%) and grain yield (16%-21%).

Conclusions

Up to the year of data collection, this is the first study to summarize all available data on Zn biofortification of PGPB-inoculated Poaceae plants and to identify influencing factors. It provides a research basis for future studies on how various microorganisms promote uptake of other nutrients by additional plants.

Graphical Abstract