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Li Rui, Lu Ming-Zhu, Liu Nian, Xiong Ya-Cen, Li Jing. Biological effects of carbon quantum dots on model plant Arabidopsis thaliana[J]. Plant Science Journal, 2019, 37(2): 240-250. DOI: 10.11913/PSJ.2095-0837.2019.20240
Citation: Li Rui, Lu Ming-Zhu, Liu Nian, Xiong Ya-Cen, Li Jing. Biological effects of carbon quantum dots on model plant Arabidopsis thaliana[J]. Plant Science Journal, 2019, 37(2): 240-250. DOI: 10.11913/PSJ.2095-0837.2019.20240

Biological effects of carbon quantum dots on model plant Arabidopsis thaliana

  • Based on the model plant Arabidopsis thaliana (L.) Heynh, we studied the biological effects of carbon quantum dots (CQDs), a new nanomaterial, and investigated their distribution and transportation, effects on growth and development, photosynthetic pigment content, oxidative stress, and stress-related gene expression levels in A. thaliana. Results showed that CQDs could be absorbed by the roots of A. thaliana and transported continuously to the leaves, which had no significant effect on seed germination rate, but significantly promoted the growth of seedling roots and plant weight. With the increase in CQD concentration, the pigment content in the chloroplast of seedlings decreased significantly, whereas the content of proline and malondialdehyde increased at first and then decreased. Superoxide dismutase (SOD) and catalase (CAT) played a leading role in the antioxidant enzyme system, and showed increasing and then decreasing activity as CQD concentration increased. The accumulation of endogenous hydrogen peroxide (H2O2) in leaves also indicated that CQDs could induce oxidative stress with concentration-dependent effects. Sulfur assimilation and stress-related genes were down-regulated after CQD treatment, which might be related to the characteristics of the CQD particles themselves. These results are of great significance for exploration of the molecular mechanisms of the bio-effects of nanomaterials on plants and for evaluating their biosafety.
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