Effect of triazine compounds on freshwater algae

Shehata, Salwa A.; El‐Dib, Mohamed; Abou-Waly, Hoda F.

doi:10.1007/bf00197196

Cited by 23 publications

(15 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…El-Dib et al (1989) recorded that, 0.2 mg/l ardoprim inhibited the growth of fresh water alga scenedesmus quadrcaudia. Shehata et al (1993) found that, increasing of gardoprim concentration to 0.5 and 1.0 mg/l increased the toxicity effect to different algal species. Osama et al (1984) concluded that, bladex in the concentration of 0.04 mg/l accelerated the inhibitory effect of Scenedesmus quadrcaudia cells which reached a maximum within three days exposure in continuous flow system.…”

Section: Resultsmentioning

confidence: 99%

Growth Response of Freshwater Algae to Continuous Flow of Terbutryn

Badr

Abou-Waly

1997

Bulletin of Environmental Contamination and Toxicology

View full text Add to dashboard Cite

The single species approach, although advantageous in comparability of results, has its limitations. The most important one is that the standard test species may not be the dominant species in natural water environment, so the algal assay test result may be irrelevant to that particular in the environment. Furthermore, phytoplankton in the aquatic environment is a mixed and balanced community. Algal species composition and interactions in the community during algal assay are important parameters for observing the algal response to the environmental stress (Del Giorgio et al 1991).Toxicant effects on aquatic microorganisms have been emphasized. Much of this research has dealt with phototrophic algae and cyanobacteria, which are the main primary producers in the hydrosphere (El-Dib et al 1989). A common contaminant of surface water of agricultural regions are triazine herbicides (Morris and Ron 1981). The volume of herbicide used and introduced into the aquatic environment as a final reservoir has grown markedly. Although research concerning the effects of herbicides on algae has been extensive, few studies have examined the impact on algal productivity. Long-term bioassay effects, using continuous system, is a relatively new approach in the screening of complex environmental compounds.The purpose of this study was to determine the changes in both growth and population of fresh water algae under stress of continuous flow of terbutryn concentrations and the rate of accumulated terbutryn algal cells. MATERIALS AND METHODSA laboratory-scale unit (continuous flow system) was designed to study the effect of triazine herbicide terbutryn (2,4-diamine-N-dimethylethyl) N-ethyl-6(methylthio)-5 triazine) (99.9% purity) obtained from CIBA Geigy (Swizerland) on the algal growth under continuous flow rate.

show abstract

Section: Resultsmentioning

confidence: 99%

Growth Response of Freshwater Algae to Continuous Flow of Terbutryn

Badr

Abou-Waly

1997

Bulletin of Environmental Contamination and Toxicology

View full text Add to dashboard Cite

show abstract

“…Hexazinone, which inhibits electron transport in photosynthetic organisms, is often detected as a water contaminant in surface and groundwaters [10,23]. Its presence in surface and groundwaters is a concern because it is toxic to primary producers that serve as the base of the food chain [15,17]. These results suggest that this bacterium may have potential value as a tool for eradicating hexazinone from contaminated soil and water.…”

Section: Introductionmentioning

confidence: 87%

Pseudomonas kuykendallii sp. nov.: A Novel γ-Proteobacteria Isolated From a Hexazinone Degrading Bioreactor

Hunter

Manter

2012

Curr Microbiol

View full text Add to dashboard Cite

Three strains of Gram-negative bacteria designated strains H2(T), H6, and H7 were isolated from bioreactors that degraded the herbicide hexazinone. Similar morphological characteristics, cellular fatty acid profiles, and 16S rRNA gene sequences show that the isolates are members of the same species. These characteristics also show that the isolates belong to the genus Pseudomonas with P. graminis, P. putida, and P. stutzeri as close relatives. The 16S rRNA gene of the H2(T) strain differed from that of type strains for P. graminis, P. putida, and P. stutzeri by 1.9, 2.5, and 2.7 %, respectively, indicating that the H2(T), H6, and H7 strains are related to P. graminis, P. putida, and P. stutzeri but are different enough to represent a novel species. The G+C content of the three strains averaged 61.2 ± 0.8 mol% which is similar to the values reported for P. graminis (61), P. putida (61.6), and P. stutzeri (62.2-65.5). The major cellular fatty acids present in the H2(T) strain were C(18:1) ω7c/C (18:1) ω6c (34.3 %), C(16:1) ω6c/C(16:1) ω7c (27.4 %), C(16:0) (20.6 %), C(12:0) (7.9 %), C(12:0) 3-OH (4.5 %), and C(10:0) 3-OH (3.1 %). The name Pseudomonas kuykendallii sp. nov. is proposed for these bacteria.

show abstract

“…(1989) après une douzaine de jours dans des enceintes contaminées par 0,1 ug/L d'atrazine (cette augmentation de la concentration en pigments est par ailleurs associée à une augmentation de la production primaire) ; PELTE (1995) avec 10 ug/L d'atrazine ; PRATT et al (1988) avec 3,2-10 ug/L d'atrazine ; BRYFOGLE et MCDIFFETT (1979) après 30 jours avec 400 ug/L de simazine ; SHEHATA et al (1993) avec 10 ug/L de gardoprim. Ce phé-nomène d'augmentation de la biomasse algale en présence d'herbicides a été plutôt observé pour de faibles doses de contaminant ou bien, si la dose est éle-vée, après une durée d'exposition importante.…”

Section: Effets Sur La Croissance Et La Biomasse Algaleunclassified

“…(1982), les interactions interspécifiques peuvent influencer la réponse de la communauté planctonique au toxique. En effet, certaines espèces phytoplanctoniques, même sensibles au contaminant en cultures seules, profitent d'une plus forte sensibilité d'autres espèces pour se développer davantage (BERARD étal., 1996(BERARD étal., , 1999BRYFOGLE et MCDIFFETT, 1979 ;GOLDSBO-ROUGH et ROBINSON, 1986 ;KASAI étal., 1993 ;PRATT et al, 1988 ;SHEHATA et al, 1993). Ainsi le phénomène de sélection des espèces phytoplanctoniques par le jeu des interactions interspécifiques modifie la réaction de chaque espèce au toxique.…”

Section: Paramètres Physico-chimiquesunclassified

Les herbicides inhibateurs du photosystème II, effets sur les communautés algales et leur dynamique

Bérard¹,

Pelte

2005

rseau

View full text Add to dashboard Cite

Nous présentons une revue bibliographique à propos des effets des herbicides inhibiteurs du Photosystème II (PS II) sur les communautés algales. Ces herbicides sont abondamment utilisés dans les pratiques phytosanitaires. Ils sont susceptibles de contaminer les milieux aquatiques et, étant donné leur mode d'action inhibitrice de la photosynthèse, ils peuvent agir directement sur les algues. De nombreuses études ont été réalisées afin d'évaluer l'impact des contaminations par ces herbicides sur les microphytes, en particulier leur effet sur la croissance et la physiologie de certaines algues (monocultures en laboratoire). D'autres études expérimentales et quelques rares in situ, ont porté sur l'impact des herbicides inhibiteurs de la photosynthèse sur la structure des peuplements algaux. Certaines tendances ont pu être ainsi dégagées quant à la sensibilité et la résistance aux herbicides des différentes espèces étudiées soit isolément, soit au sein des peuplements. Les herbicides inhibiteurs du PS II perturbent effectivement la structure des peuplements phytoplanctoniques de façon plus ou moins marquée. L'impact des herbicides sur les algues est variable selon la structure des peuplements (liée aux successions) et les paramètres environnementaux, notamment liés à la saison. Nous devons donc développer nos connaissances à propos des interactions entre toxiques et facteurs environnementaux sur des pas de temps correspondant non seulement aux rythmes des contaminations mais aussi aux rythmes des succesions alagles, car ces interactions sont susceptibles de réduire ou d'amplifier les conséquences d'une pollution par ces toxiques dans les milieux aquatiques.The aim of this paper is to present a review about the impact of Photo system II (PS II) inhibitors on algae communities. A brief discussion of the use in agriculture, the different chemical families, the photosynthetic inhibition effect and the occurrence of these compounds in aquatics systems is followed by the presentation of the impacts these herbicides have on algae. Many studies investigate the effects of PS II inhibitors on algae growth and physiology. The response to pollutants were studied by monitoring changes in terms of different parameters : chlorophyll fluorescence induction usually increases with PS II inhibitors. Concentration of pigments decreases with PS II inhibitors, but increases sometimes with low contaminations of these toxicants (it is probably an homeostasis effect). Pigment ratio can change with herbicide exposure. Primary production (measured by 14C incorporation or dissolved O2) usually decreases with PS II inhibitors. But, the " excretion " of dissolved organic compounds may increase with PS II inhibitors. These herbicides may alter or change cell morphology of algae. In consequence algae growth is inhibited by PS II inhibitors exposure. But growth inhibition varies, depending on each species' (and strain) sensibility or resistance to each herbicide. By this way, PS II inhibitors can affect the algae community structure. In consequence, ...

show abstract

Effect of triazine compounds on freshwater algae

Cited by 23 publications

References 1 publication

Growth Response of Freshwater Algae to Continuous Flow of Terbutryn

Growth Response of Freshwater Algae to Continuous Flow of Terbutryn

Pseudomonas kuykendallii sp. nov.: A Novel γ-Proteobacteria Isolated From a Hexazinone Degrading Bioreactor

Les herbicides inhibateurs du photosystème II, effets sur les communautés algales et leur dynamique

Contact Info

Product

Resources

About