AI Article Synopsis

  • This study examines how boron (B) supplementation affects the remodeling of plant cell walls (CW) in Citrus sinensis seedlings exposed to high levels of copper (Cu).
  • The researchers found that adding B helped mitigate the harmful effects of Cu by lowering its concentrations in the plant's leaves and roots, thus promoting healthier growth.
  • Techniques like Fourier transform infrared (FTIR) and X-ray diffraction (XRD) were used to show that certain components of the cell walls (such as pectin and cellulose) can bind to Cu, reducing its toxic effects on the plants.

Article Abstract

Little information is available on how boron (B) supplementation affects plant cell wall (CW) remodeling under copper (Cu) excess. 'Xuegan' (Citrus sinensis) seedlings were submitted to 0.5 or 350 µM Cu × 2.5 or 25 µM B for 24 weeks. Thereafter, we determined the concentrations of CW materials (CWMs) and CW components (CWCs), the degree of pectin methylation (DPM), and the pectin methylesterase (PME) activities and PME gene expression levels in leaves and roots, as well as the Cu concentrations in leaves and roots and their CWMs (CWCs). Additionally, we analyzed the Fourier transform infrared (FTIR) and X-ray diffraction (XRD) spectra of leaf and root CWMs. Our findings suggested that adding B reduced the impairment of Cu excess to CWs by reducing the Cu concentrations in leaves and roots and their CWMs and maintaining the stability of CWs, thereby improving leaf and root growth. Cu excess increased the Cu fractions in leaf and root pectin by decreasing DPM due to increased PME activities, thereby contributing to citrus Cu tolerance. FTIR and XRD indicated that the functional groups of the CW pectin, hemicellulose, cellulose, and lignin could bind and immobilize Cu, thereby reducing Cu cytotoxicity in leaves and roots.

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Source
http://dx.doi.org/10.1016/j.jhazmat.2024.133738DOI Listing

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