https://orcid.org/0000-0003-2929-6776
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ABSTRACT
The study was aimed at the migration and transformation of lead compounds in the rhizosphere, its accumulation in plants under the influence of the rhizosphere bacteria. For experiment, soil samples of the technogenous ecosystem contaminated differently by lead have been selected for plant growing. The samples were subdivided into control soil and the soil, inoculated by Azotobacter and Bacillus rhizobacteria. Lead concentrations have been analysed in easily exchangeable, carbonate, organic and Fe hydroxide-associated fractions as well in chelate forms and fulvic and humic acids. In soils, inoculated by rhizobacteria, there is an increased mobilisation of lead due to its decrease in humic acids and increase in fulvic acids. On technogenic soil, rhizobacteria initiate the immobilisation of Fe-hydroxide-bound, chelate-bound lead in the rhizosphere as well as lead occurring in roots. As a results, there is a decreased lead uptake by upper parts of plants. There is also a correlation between increasing soil alkalinity and increasing Pb accumulation in the roots of plants. The results of the experiment helped to understand more about the mechanisms of Pb compound behaviour under the influence of rhizobacteria that can be used for developing biotechnologies related to soil bioremediation and crop production.
Acknowledgments
The authors are grateful to Arsentyeva A.G., a staff scientist for assistance in analytical work. We also grateful to Khomutova M. Yu. for editing the English version of the text. The study was performed by the governmental assignment in terms of Project № 0350-2019-0005 АААА-А17-117041910034-5 and with the financial support RFBR grant № 15-05-03919 and by grant from ‘The Tomsk State University competitiveness improvement programme’.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Notes on contributors
Belogolova Galina Alexandrovna obtained Ph.D in geological and mineralogical sciences. She is a senior research scientist of IGC SB RAS. The field of scientific interests is the biogeochemical processes in soil-plant system.
Gordeeva Olga Nikolaevna obtained Ph.D in geological and mineralogical sciences. She is a junior research scientist IGC SB RAS. The area of scientific interests is the investigation of trace elements migration in soil-plant system.
Sokolova Marina Gavrilovna obtained Ph.D in biology science. She is a leading technologist Siberian Institute of Physiology and Biochemistry of Plants, Siberian Branch of the Russian Academy of Sciences. The field of scientific interests is the plant physiology and soil microbiology.
Pastukhov Mikhail Vladimirovich obtained Ph.D in biology science. He is a senior research scientist IGC SB RAS. The area of scientific interests is the study of the chemical composition of sediment and biological objects.
Poletaeva Vera Igorevna obtained Ph.D in geological and mineralogical sciences. She is a research scientist IGC SB RAS. The area of scientific interests is the research of geo-ecology and hydrochemistry.
Vaishlya Оlga Borisovna obtained Ph.D in biology. She is an assistant professor of the National Research Tomsk State University. The field of scientific interests is the microbiology and plant physiology.
Belozerova Olga Yurievna obtained Ph.D in chemical science. She is a senior research scientist IGC SB RAS. The field of scientific interests is the Electron Probe X-ray microanalysis of environmental and geological objects.
ORCID
Galina Belogolova http://orcid.org/0000-0003-2929-6776
Olga Gordeeva http://orcid.org/0000-0001-5406-1130
Mikhail Pastukhov http://orcid.org/0000-0003-1078-7145
Vera Poletaeva http://orcid.org/0000-0002-3139-5864
Olga Belozerova http://orcid.org/0000-0002-8098-3590