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Effect of microbial competition on the survival and activity of 2,4‐D‐degrading Alcaligenes xylosoxidans subsp. denitrificans added to soil
Author(s) -
Fournier J.C.
Publication year - 1993
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.1993.tb01389.x
Subject(s) - microbial inoculant , alcaligenes , fumigation , inoculation , biology , population , competition (biology) , microbiology and biotechnology , bacteria , food science , horticulture , ecology , pseudomonas , genetics , demography , sociology
In laboratory experiments samples of natural or chloroform‐fumigated soils were inoculated with an Alcaligenes xylosoxidans subsp. denitrificans which is able to use 2,4‐dichlorophenoxyacetic acid (2,4‐D) as a sole carbon source. Biotic factors affecting survival and activity of the inoculant were determined. In natural soil the numbers and activity of Alc. xylosoxidans declines in few days. The strain proliferated only when it was inoculated immediately after soil fumigation. Its activity 15 d after inoculation was then twice its initial activity. When inoculation of fumigated samples was delayed, the numbers of Alc. xylosoxidans declined, but its activity was higher than in the natural soil. Addition of soil bacteria or fungi resulted in a reduction in the numbers and activity of Alc. xylosoxidans. These results suggest that microbial competition for nutrients and biological spaces causes the decline in the population and activity of inoculant added to soil.