The effect of herbicides on growth and photosynthetic pigments of three submerged macrophytes | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 8, Issue 3, December 2000, Pages 71-84 PDF (413 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2000.460578 | ||
| Author | ||
| Mary G. Ghobrial* | ||
| National institute of Oceanography and Fisheries | ||
| Abstract | ||
| An undesirable side-effect of the agricultural use of herbicides is that they damage the flora of the adjacent water bodies. The possibility that results from such hazard was investigated by evaluating the response of the three isolated submerged macrophytes; Ceratophyllum demersum, Polamogelon pectinatus and Elodea canadensis to acetochlor and paraquat. Plants in laboratory bioassays were exposed to 11, 16 and 22 ug/l acetochlor and 100, 300 and 500 ug/l paraquat. Ceratophyllum lost its weight (at using 11 & 16 ug/l acetochlor) but recovered again at higher concentration (22 ug/l), while the plant was injured by all paraquat levels. Its chlorophyll a and b contents fluctuated between increases and decreases without respect to herbicide levels. Potamogeton showed increases in its fresh weight yield at exposure to 11 & 16 ug/l acetochlor. It lost its weight at exposure to 300 ug/l paraquat, but recovered at 500 ug/l paraquat. Its chlorophyll a and b contents showed increases at the lowest herbicides levels after which they were reduced at higher concentrations. Elodea showed increases in biomass as well as chlorophyll a and b contents, particularly at 11 ug/l acetochlor and 100 ug/l paraquat. Generally, carotenes decreased in tested plants at all herbicidal concentration levels. The results that any plant was predictively most sensitive than the other concerning both growth performance together with photosynthetic pigments variatins. | ||
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