NATURAL PRODUCT RESEARCH AND DEVELOPMENT ›› 2022, Vol. 34 ›› Issue (11): 1930-1938. doi: 10.16333/j.1001-6880.2022.11.014

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Effects of organophosphate-degradation bacteria on heavy metal elements in Paris polyphylla var. yunnanensis rhizomes, fibrous roots and rhizosphere soils

LI Zhuo-wei,YUAN Lin,YE Ming-yan,LAN Guo-xin*,ZHOU Nong*   

  1. College of Food and Biology Engineering,Chongqing Three Gorges University,Chongqing 404120,China
  • Online:2022-11-25 Published:2022-11-25

Abstract:

To explore the change rule of heavy metal residues in rhizomes,fibrous roots and rhizosphere soils of Paris polyphylla var. yunnanensis inoculated with different organophosphate-degradation bacteria (OPDB),which provides a reference for heavy metal pollution remediation during artificial planting of Paris polyphylla var. yunnanensis.Through indoor pot plant inoculation experiments,the effects of residues of inoculating different OPDB on mercury (Hg),cadmium (Cd),lead (Pb),chromium (Cr),and arsenic (As) heavy metals in rhizomes,fibrous roots and rhizosphere soils of  Paris polyphylla var. yunnanensis were studies.Compared with the control group,inoculation with different OPDB had different differences in the residues of five heavy metals in rhizomes and fibrous roots of Paris polyphylla var. yunnanensis,and the restoration effect on the heavy metal Pb was the most obvious.The S7 group (Bacillus mycoides,B. wiedmannii,B. proteolyticus) has the most obvious repair effect on heavy metals.In addition,the Single pollution index and the Nemerow pollution index showed that,except for the soil in the B. mycoides treatment group,which had a risk of contamination,the rest of the treatment groups reached a clean level.At the same time,the enrichment abilities of the five heavy metal elements in rhizomes and fibrous roots of Paris polyphylla var. yunnanensis were different,with the maximum enrichment coefficient was Cd,and the minimum was Cr.The enrichment capacity in the rhizomes of Paris polyphylla var. yunnanensis in S7 group was relatively small.The correlation analysis showed that Hg and Pb elements in rhizomes and fibrous roots of Paris polyphylla var. yunnanensis were significantly positively correlated (P<0.05),and the correlation coefficients were 0.761 and 0.811,respectively.It can be seen that the content of Hg,Pb and Cr in the rhizomes and fibrous roots of Paris polyphylla var. yunnanensis can be effectively reduced by inoculation with OPDB,and the S7 group has the best effect.

Key words: Paris polyphylla , var. , yunnanensis, organophosphate-degradation bacteria, heavy metal, enrichment coefficients

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