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Background and aims <p>Novel combinations of plant growth-promoting rhizobacteria (PGPR) and nanoparticles (NPs) has been recognized as an emerging strategy for enhancing plant growth and crop yield, but its potential application in woody plants remains largely unexplored.</p> Methods <p>This study investigated the effects of <i>Pantoea endophytica</i> and silica NPs application on the growth and cold tolerance of <i>Osmanthus fragrans</i> under low-temperature conditions.</p> Results <p>The combination of PGPR and SiO₂NPs promoted the growth and antioxidant enzyme activities of <i>O. fragrans</i> more effectively than either treatment alone. Analyses of both rhizosphere bacterial community and root transcriptome indicated that the combined treatment induced more targeted changes in the rhizosphere environment and root transcriptomic profile than the individual applications. Specifically, the combined treatment increased the abundance of beneficial bacteria such as g_<i>Flavobacterium</i> and g_<i>TM7a</i>, and upregulated the expression of several functional genes (<i>OfPER28</i>, <i>OfWRKY6</i>a). These shifts in key ASVs and gene expression were closely associated with the optimal performance of <i>O. fragrans</i> in growth and cold tolerance. Moreover, these key ASVs and functional genes exhibited strong correlations with plant growth, physiological and biochemical characteristics, and soil properties.</p> Conclusions <p>This study demonstrates that the combined application of PGPR and NPs enhances the growth and cold resistance of <i>O. fragrans</i> more effectively than either treatment alone, which may involve complex interactions within the plant-soil systems. This finding provides a foundational framework for optimizing such combinations in woody plants beyond <i>O. fragrans</i>.</p>

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The PGPR Pantoea endophytica and silica nanoparticles coordinate root–rhizosphere dynamics to enhance cold tolerance in Osmanthus fragrans

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Xiaofeng Zhang,
  • Xinyi Liu,
  • Qingyin Tian,
  • Mengyao Wei,
  • Gongwei Chen,
  • Tingting Shi,
  • Yuanzheng Yue,
  • Lianggui Wang,
  • Xiulian Yang

摘要

Background and aims

Novel combinations of plant growth-promoting rhizobacteria (PGPR) and nanoparticles (NPs) has been recognized as an emerging strategy for enhancing plant growth and crop yield, but its potential application in woody plants remains largely unexplored.

Methods

This study investigated the effects of Pantoea endophytica and silica NPs application on the growth and cold tolerance of Osmanthus fragrans under low-temperature conditions.

Results

The combination of PGPR and SiO₂NPs promoted the growth and antioxidant enzyme activities of O. fragrans more effectively than either treatment alone. Analyses of both rhizosphere bacterial community and root transcriptome indicated that the combined treatment induced more targeted changes in the rhizosphere environment and root transcriptomic profile than the individual applications. Specifically, the combined treatment increased the abundance of beneficial bacteria such as g_Flavobacterium and g_TM7a, and upregulated the expression of several functional genes (OfPER28, OfWRKY6a). These shifts in key ASVs and gene expression were closely associated with the optimal performance of O. fragrans in growth and cold tolerance. Moreover, these key ASVs and functional genes exhibited strong correlations with plant growth, physiological and biochemical characteristics, and soil properties.

Conclusions

This study demonstrates that the combined application of PGPR and NPs enhances the growth and cold resistance of O. fragrans more effectively than either treatment alone, which may involve complex interactions within the plant-soil systems. This finding provides a foundational framework for optimizing such combinations in woody plants beyond O. fragrans.