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Foliar Transpiration Inhibitor Reduces Cd Accumulation in Rice Grain: The Potential Effect of the Endophytic
Ge Lei1,2, Huijuan Song1, Ziwen Gan1
1Department of Environment & Ecology, Hunan Agricultural University, Changsha 410128, China.
Toxics
|September 27, 2025
Summary
Foliar transpiration inhibitors (TIs) reduce cadmium (Cd) accumulation in rice grains by altering root-to-grain translocation. TIs also enhance beneficial endophytic bacteria, promoting plant health and reducing Cd uptake.
Area of Science:
- Agricultural Science
- Environmental Science
- Microbiology
Background:
- Cadmium (Cd) accumulation in rice poses a significant human health risk.
- The impact of foliar transpiration inhibitors (TIs) on Cd translocation and rice endophytic bacteria remains unclear.
Purpose of the Study:
- To investigate the effect of foliar TIs on Cd translocation in rice plants.
- To analyze the changes in endophytic bacterial communities induced by TIs.
- To identify potential endophytic bacteria involved in inhibiting Cd translocation.
Main Methods:
- Rice plants from three sites with varying Cd levels were sprayed with foliar TIs.
- Analysis of Cd, N, P, K, and water-soluble saccharide (WSS) content in different plant parts.
- Assessment of endophytic bacteria community structure in rice stems using molecular techniques.
Main Results:
- Foliar TIs reduced the Cd translocation factor (TFCd) from root to grain by approximately 20%.
- TI application increased stem node adsorptive site concentration and enhanced endophytic bacterial diversity (Shannon index increased from 3.29 to 3.92).
- Induced endophytic bacteria exhibited increased potential for biofilm formation, stress tolerance, and metal transport; specific bacteria (e.g., Burkholderiaceae) showed correlations with reduced TFCd and increased WSS.
Conclusions:
- Foliar TIs effectively mitigate Cd translocation in rice, reducing grain Cd accumulation.
- TIs promote a beneficial shift in the endophytic bacterial community, enhancing diversity and functional capabilities.
- The enhanced endophytic bacteria, particularly certain taxa, play a crucial role in reducing Cd translocation, offering a novel strategy for Cd phytoremediation.
