Effects of complex pollution of Pb and B[a]P on the growth and physiological and biochemical indexes of ryegrass were investigated in a potted soil. The results showed that under single Pb treatment condition, low-concentration (0–100 mg kg−1) Pb stimulated the increase of ryegrass biomass while high-concentration (200–400 mg kg−1) Pb obviously inhibited ryegrass growth. Under single B[a]P pollution condition, low-concentration (0–30 mg kg−1) B[a]P facilitated the growth of ryegrass while high-concentration (50–100 mg kg−1) B[a]P had toxic effect on ryegrass. Under joint impacts of Pb and B[a]P at low concentrations, biomass, chlorophyll content and carotenoid content as well as POD and CAT activities of ryegrass presented firstly rising and then descending trends, SOD accumulation increased slightly and MDA didn’t experience obvious change. Under co-existence of Pb and B[a]P, Pb was the main toxic factor for ryegrass growth and it controlled the variation trend of whole growth cycle of ryegrass.
Bulletin of Environmental Contamination and Toxicology – Springer Journals
Published: Jun 2, 2018
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