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Melatonin facilitated Pb accumulation in bermudagrass by modulating radial transport pathways
Chengcheng Xie1, Xinyi Cai2, Xuzixin Zhou1
1School of Humanities and Tourism, Yibin Vocational and Technical College, Yibin, 644100, China.
Plant Physiology and Biochemistry : PPB
|August 5, 2025
Summary
Exogenous melatonin enhances lead (Pb) uptake and translocation in bermudagrass roots by regulating Pb transporter genes and root growth. This study provides a foundation for using melatonin in phytoremediation of Pb-contaminated soils.
Area of Science:
- Plant Physiology and Molecular Biology
- Environmental Science and Phytoremediation
Background:
- Radial transport of lead (Pb) in plant roots is crucial for its translocation to shoots.
- The role of exogenous melatonin in modulating Pb radial transport and its underlying mechanisms in bermudagrass is not well understood.
Purpose of the Study:
- To investigate the morphological and molecular mechanisms by which exogenous melatonin influences Pb radial transport in bermudagrass roots.
- To determine the effect of different melatonin concentrations on Pb tolerance, accumulation, and translocation in bermudagrass.
Main Methods:
- Treatment of bermudagrass with varying concentrations of exogenous melatonin and lead (Pb).
- Analysis of Pb accumulation and translocation in roots and shoots.
- Gene expression analysis of key Pb transporter genes and genes involved in root endodermal development (Casparian strip and suberin lamellae formation).
- Assessment of root morphology and growth inhibition.
Main Results:
- Low-concentration melatonin (4 μM) significantly enhanced Pb accumulation in shoots (1.65-fold increase) and root-to-shoot translocation.
- Melatonin upregulated symplastic Pb transporter genes (CdACBP1, CdACBP4) and downregulated lignin/suberin biosynthesis genes (CdLAC3, CdCYP86-B1), affecting endodermal differentiation.
- Melatonin alleviated Pb-induced root growth inhibition, promoting root tip formation and increasing apoplastic Pb entry (64% contribution).
Conclusions:
- Exogenous melatonin promotes Pb radial transport and root-to-shoot translocation in bermudagrass.
- Melatonin's effects are mediated by regulating Pb transporter gene expression, root growth, and root endodermal differentiation.
- These findings offer a theoretical basis for applying melatonin in phytoremediation of Pb-contaminated soils.
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