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Interactions between three blue‐green algae and herbicide 2,4‐D in culture media
Author(s) -
Kobbia I. A.,
ElSharouny H. M.
Publication year - 1985
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.3620250608
Subject(s) - nitrogenase , nostoc , biology , algae , chlorophyll a , chlorophyll , botany , photosynthesis , cyanobacteria , nitrogen fixation , bacteria , genetics
Nostoc muscorum, Tolypothrix lanata and Aulosira laxa showed different responses to 2,4‐D herbicide at all concentrations. Low concentrations of the herbicide stimulated chlorophyll a synthesis and promoted growth in all species. The maximum values of chlorophyll a contents were recorded at 50 ppm for Nostoc muscorum and Tolypothrix lanata , and at 10 ppm for Aulosira laxa. Above these levels, chlorophyll accumulation was steadily inhibited in all organisms. The nitrogenase activities in the three species were markedly inhibited and the degree of inhibition increased with increasing concentrations. Nitrogenase activities were always higher at anaerobic than at aerobic conditions, a phenomenon that was reversed at higher concentrations of 2,4‐D in Nostoc muscorum .