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Influence of Gramoxone and paraquat on growth and respiration of Azotobacter vinelandii
Author(s) -
Gadkari Dilip
Publication year - 1987
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620270808
Subject(s) - paraquat , azotobacter vinelandii , incubation , respiration , chemistry , catalase , incubation period , lag time , biochemistry , zoology , food science , biology , botany , nitrogen , nitrogen fixation , enzyme , nitrogenase , organic chemistry , biological system
The influence of the herbicide Gramoxone and its active ingredient paraquat on growth and respiratory activity of Azotobacter vinelandii was studied. The experiments were performed in nitrogen‐free medium and in medium with combined nitrogen. Addition of Gramoxone (50 ppm) or paraquat (15 ppm) to the cultures during lag phase caused a total inhibition of growth. However, even after 24 h of incubation in the presence of herbicides the number of viable counts did not decrease. When herbicides were added to exponentially growing cultures, the growth response of the cultures was different. After addition of herbicides only a transient short inhibition period was noted and the length of the inhibition period was dependent on the time of herbicide addition. Neither Gramoxone (50 ppm) nor paraquat (15 ppm) enhanced catalase production. The respiratory activity of paraquat‐treated cells in the presence of 1 mM KCN was distinctly reduced (75%), while that of untreated cells did not change.