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An indoor simulation experiment was conducted to explore the effects of cuticular wax content and specific leaf area (SLA) on accumulation and distribution of PAHs in different tissues of wheat leaf. Three levels (0, 1.25, 6.0 mg L) of mixed solution of five PAHs (ΣPAHs) including phenanthrene (PHE), anthracene (ANT), pyrene (PYR), benz[a]anthracene (BaA), and benzo[a]pyrene (BaP) were sprayed on leaves of seven varieties of winter wheat for every other day during 20 consecutive days. Shoot and root biomass of wheat under 6.0 mg L ΣPAHs exposure were 5.87 and 0.33 g, which were significantly (p < 0.05) lower than those (7.14 and 0.65 g) without spraying ΣPAHs solution, respectively. Elevated ΣPAHs concentration in spraying solution significantly (p < 0.0001) decreased cuticular wax content (59.1 and 65.1 vs. 67.8 mg g) in leaves of wheat but exerted slight effects on SLA. Regardless of spraying ΣPAHs or not, SLA in leaves of Jiaomai (269-276 cm g) and Zhengmai (265-285 cm g) and cuticular wax content (104-118 mg g) in leaves of Zhengmai were significantly higher than other varieties of wheat, respectively. ΣPAHs concentration in cuticular waxes ranged from 24,616 to 106,353 μg kg, which was 2~3 orders and 1~2 orders of magnitude higher than that in mesophylls (46.0-535 μg kg) and leaves (785-5366 μg kg). There was a significant (r = 0.46, p < 0.05, n = 28) positive correlation between SLA and ΣPAHs concentration in wheat leaves when spraying 1.25 mg L of ΣPAHs. The present study indicated that cuticular wax content was significantly (p < 0.01) positive correlated with ΣPAHs concentration in the leaves and the translocation factor (TF) of PHE, ANT, PYR, and ΣPAHs from cuticular wax to mesophyll. Based on principal component analysis (PCA), cuticular wax content was the main limiting factor for folia uptake of PAHs in winter wheat. The present study suggested that cuticular wax could play significant roles in foliar uptake of PAHs of wheat via affecting their accumulation in cuticular wax and translocation to mesophyll.
This article was published in the following journal.
Name: Environmental science and pollution research international
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Agents that cause vomiting. They may act directly on the gastrointestinal tract, bringing about emesis through local irritant effects, or indirectly, through their effects on the chemoreceptor trigger zone in the postremal area near the medulla.
A pathologic condition resulting from accumulation of acid or depletion of the alkaline reserve (bicarbonate) content of the blood and body tissues, and characterized by an increase in hydrogen ion concentration (decrease in pH). (Dorland, 27th ed)
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Collective name for a group of external MECHANORECEPTORS and chemoreceptors manifesting as sensory structures in ARTHROPODS. They include cuticular projections (setae, hairs, bristles), pores, and slits.