EFFECT OF 2, 4-DICHLOROPHENOXY ACETIC ACID ON CYANOBACTERIA (ANABAENA SP) GROWTH IN THE PRESENCE OF EITHER GLOCUSE OR TRYPTOPHANE | ||||
| Egyptian Journal of Phycology | ||||
| Article 9, Volume 6, Issue 1, 2005, Page 127-135 PDF (421.5 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/egyjs.2005.114049 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Skina T. A. Tantawy1; El Sayeda A. Hassan2 | ||||
| 1Botany Department, Faculty of Sience, Cairo University, Giza, Egypt | ||||
| 2Agricultural Microbiology Department, Soils, Water & Environ. Res. Inst., Agric. Res. Center, Giza, Egypt | ||||
| Abstract | ||||
| 2,4-Dichiorophenoxyacetic acid (2,4-D) stimulated growth and heterocyst differentiation of Anabaena sp. in nitrogen free medium at low concentration 100 µg mL-1 while its higher concentrations inhibited both processes and 500 µg mL-1 proved to be lethal. Dry mass and specific growth rate of algae declined with increasing concentration of 2,4-D in the range of 100-1500 µg mL-1. Glucose slightly increased the heterocyst frequency without any lag in their differentiation. Tryptophan promoted growth of the alga and formation of heterocysts (nearly three fold). Tryptophan (50 µg mL-1) complex medium with 1 mg 2, 4-D per ml did not produce mature heterocysts. The filaments were fragmented at the point of heterocyst development and detached heterocyst germinated in situ. Glucose and tryptophan protected the alga, its growth and heterocyst differentiation even at the lethal concentration of the herbicide. | ||||
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