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Dependence of Plant Uptake and Diffusion of Polycyclic Aromatic Hydrocarbons on the Leaf Surface Morphology and Micro-structures of Cuticular Waxes

View Article: PubMed Central - PubMed

ABSTRACT

The uptake of organic chemicals by plants is considered of great significance as it impacts their environmental transport and fate and threatens crop growth and food safety. Herein, the dependence of the uptake, penetration, and distribution of sixteen polycyclic aromatic hydrocarbons (PAHs) on the morphology and micro-structures of cuticular waxes on leaf surfaces was investigated. Plant surface morphologies and wax micro-structures were examined by scanning emission microscopy, and hydrophobicities of plant surfaces were monitored through contact angle measurements. PAHs in the cuticles and inner tissues were distinguished by sequential extraction, and the cuticle was verified to be the dominant reservoir for the accumulation of lipophilic pollutants. The interspecies differences in PAH concentrations cannot be explained by normalizing them to the plant lipid content. PAHs in the inner tissues became concentrated with the increase of tissue lipid content, while a generally negative correlation between the PAH concentration in cuticles and the epicuticular wax content was found. PAHs on the adaxial and abaxial sides of a leaf were differentiated for the first time, and the divergence between these two sides can be ascribed to the variations in surface morphologies. The role of leaf lipids was redefined and differentiated.

No MeSH data available.


Plant uptake and diffusion resistance of organic pollutants were dominated by the leaf surface morphologies and micro-structures of epicuticular wax rather than just their lipid contents.
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f6: Plant uptake and diffusion resistance of organic pollutants were dominated by the leaf surface morphologies and micro-structures of epicuticular wax rather than just their lipid contents.

Mentions: In summary, plant uptake of PAHs was a complex process. Wide differences were discovered among the selected plant species. Hypericum and Pinus were considered to be the superior reservoirs for organic pollutant accumulation and can be further applied as effective passive samplers for organic pollution monitoring. Mahonia showed an extraordinary capability in blocking organic pollutants from penetrating into the inner tissue of the leaf. The plant surface morphology, specifically the cuticular wax micro-structure, was found to be an essential factor regulating the deposition, distribution, and penetration of organic pollutants in and across plant cuticles (Fig. 6). This study provided a theoretical reference to precisely predict the plant uptake of HOCs and to design a smart biomimic material for HOC passive sampler.


Dependence of Plant Uptake and Diffusion of Polycyclic Aromatic Hydrocarbons on the Leaf Surface Morphology and Micro-structures of Cuticular Waxes
Plant uptake and diffusion resistance of organic pollutants were dominated by the leaf surface morphologies and micro-structures of epicuticular wax rather than just their lipid contents.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5385540&req=5

f6: Plant uptake and diffusion resistance of organic pollutants were dominated by the leaf surface morphologies and micro-structures of epicuticular wax rather than just their lipid contents.
Mentions: In summary, plant uptake of PAHs was a complex process. Wide differences were discovered among the selected plant species. Hypericum and Pinus were considered to be the superior reservoirs for organic pollutant accumulation and can be further applied as effective passive samplers for organic pollution monitoring. Mahonia showed an extraordinary capability in blocking organic pollutants from penetrating into the inner tissue of the leaf. The plant surface morphology, specifically the cuticular wax micro-structure, was found to be an essential factor regulating the deposition, distribution, and penetration of organic pollutants in and across plant cuticles (Fig. 6). This study provided a theoretical reference to precisely predict the plant uptake of HOCs and to design a smart biomimic material for HOC passive sampler.

View Article: PubMed Central - PubMed

ABSTRACT

The uptake of organic chemicals by plants is considered of great significance as it impacts their environmental transport and fate and threatens crop growth and food safety. Herein, the dependence of the uptake, penetration, and distribution of sixteen polycyclic aromatic hydrocarbons (PAHs) on the morphology and micro-structures of cuticular waxes on leaf surfaces was investigated. Plant surface morphologies and wax micro-structures were examined by scanning emission microscopy, and hydrophobicities of plant surfaces were monitored through contact angle measurements. PAHs in the cuticles and inner tissues were distinguished by sequential extraction, and the cuticle was verified to be the dominant reservoir for the accumulation of lipophilic pollutants. The interspecies differences in PAH concentrations cannot be explained by normalizing them to the plant lipid content. PAHs in the inner tissues became concentrated with the increase of tissue lipid content, while a generally negative correlation between the PAH concentration in cuticles and the epicuticular wax content was found. PAHs on the adaxial and abaxial sides of a leaf were differentiated for the first time, and the divergence between these two sides can be ascribed to the variations in surface morphologies. The role of leaf lipids was redefined and differentiated.

No MeSH data available.