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| Effects of sulfur nanoparticles on growth and Pb accumulation in Brassica napus L. seedlings under Pb stress |
| Received:July 13, 2020 |
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| KeyWord:sulfur nanoparticles;Brassica napus L.;Pb stress;accumulation;antioxidant enzymes |
| Author Name | Affiliation | E-mail | | YUAN Hai-yan | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | | | LIU Qing-quan | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | | | ZHANG Yong-xia | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | | | FU Jia-hao | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | | | WANG Yin-jie | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | | | SUN Yu-ming | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | | | TONG Hai-ying | Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China | njtonghy@163.com |
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| Abstract: |
| To explore the effects of sulfur nanoparticles(SNPs) on the growth and heavy metal accumulation in plants, their effects on the growth, physiology and Pb accumulation in Brassica napus L. seedlings were studied using Murashige and Skoog(MS) media culture with additions of Pb and SNPs. The results showed that 1.2 mmol·L-1 Pb had no obvious effect on seed germination although it did significantly prohibit the growth of the Brassica seedlings and decrease the fresh weight thereof by 38.9% compared with that of the control(Pb0). Pb stress also resulted in serious lipid peroxidation, and the malondialdehyde(MDA) contents in the shoots and roots of B. napus were independently, 3.7 and 2.5 times that of the control, respectively. Moreover, the activities of antioxidant enzymes including superoxide dismutase(SOD), peroxidase(POD), catalase(CAT), and ascorbate peroxidase(APX) were all induced and increased by Pb stress. However, in contrast with the single Pb stress treatment, the Pb contents in shoots and roots exposed to the combined Pb+SNPs treatment were only 5.7% and 29.5% those of Pb stress treatment, respectively. Furthermore, the dry weights of shoots and roots increased by 70.7% and 26.1% over those in the single Pb stress treatment, and the MDA contents and antioxidant enzymes activities thereof were all lower than the levels in the latter. In addition, SNPs had a more significant preference for inhibiting Pb uptake and alleviating Pb toxicity compared to sulfur bulk particles(SBPs) and sulfate. Therefore, SNPs plays an incredibly important role in prohibiting Pb absorption and alleviating Pb toxicity in B. napus. |
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