Action of the phenylpyridazinone herbicides Basf 33650 and Basf 44521 on the green and orange cells of Chlorella fusca | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 2, Issue 1, 1990, Pages 127-137 PDF (872.38 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1990.460690 | ||
| Authors | ||
| O. H. Sayed* ; M. M. Tantawy | ||
| Department of Botany, Faculty of Science, and Department of Plant Protection, Faculty of Agriculture, University of Minia, Minia, Egypt. | ||
| Abstract | ||
| Autotrophically grown Chlorella fusca cells were treated with different concentrations of the phenylpyridazinone herbicides BASF 33650 [1- phenyl- 4-methoxy-5-bromo-pyridazinone], and BASF 44521 [4-chloro- 5-methoxy-2-(α,α,α,-trifluoro-m-tolyl)-3(2H)-pyridazinone] for 96 hours. The treatments induced retardation of cell division, reduction of both total chlorophyll and carotenoid contents, reduction of the Chl a : Chl b ratio, and inhibition of oxygen evolution compared to untreated control. BASF 44521 was more effective as an inhibitor of cell division than BASF 33650. On the other hand, incorporation of these herbicides in the nitrate-rich medium during regreening of orange nitrogen-deficient cells slightly inhibited growth, pigment synthesis, and the development of an oxygen-evolving capability when compared to control. Despite this slight inhibition, cultures treated at all concentrations applied could, at least partially, regreen within 72 h. | ||
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