Author:
Bakaeva Margarita,Kuzina Elena,Vysotskaya Lidiya,Kudoyarova Guzel,Arkhipova Tat’yana,Rafikova Gulnaz,Chetverikov Sergey,Korshunova Tat’yana,Chetverikova Dar’ya,Loginov Oleg
Abstract
The phytoremediation of soil contaminated with petroleum oil products relies on co-operation between plants and rhizosphere bacteria, including the plant growth-promoting effect of the bacteria. We studied the capacity of strains of Pseudomonas, selected as oil degraders, to produce plant hormones and promote plant growth. Strains with intermediate auxin production were the most effective in stimulating the seedling growth of seven plant species under normal conditions. Bacterial seed treatment resulted in about a 1.6-fold increase in the weight of barley seedlings, with the increment being much lower in other plant species. The strains P. plecoglossicida 2.4-D and P. hunanensis IB C7, characterized by highly efficient oil degradation (about 70%) and stable intermediate in vitro auxin production in the presence of oil, were selected for further study with barley. These strains increased the seed germination percentage approximately two-fold under 5% oil concentration in the soil, while a positive effect on further seedling growth was significant when the oil concentration was raised to 8%. This resulted in a 1.3–1.7-fold increase in the seedling mass after 7 days of growth, depending on the bacterial strain. Thus, strains of oil-degrading bacteria selected for their intermediate and stable production of auxin were found to be effective ameliorators of plant growth inhibition resulting from petroleum stress.
Funder
Ministry of Science and Higher Education of the Russian Federation
Subject
Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics
Cited by
21 articles.
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