## Abstract Effects of UV radiation on the morphogenesis of __Anabaena doliolum__ are described. After irradiation the frequencies of the 2nd and 3rd cells in 4βcelled filaments differentiating into a heterocyst increase markedly. The spatial relations between successive heterocysts of the series i
The effect of caffeine and light on killing of the blue-green alga Anabaena doliolum by ultraviolet radiation
β Scribed by Srivastava, B. S. ;Kumar, H. D. ;Singh, H. N.
- Publisher
- Springer-Verlag
- Year
- 1971
- Weight
- 579 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0003-9276
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Two kinds of cultures were raised from clones of Anabaena doliolum surviving on selective medium following exposure of spores to ultraviolet radiation. The pigments of these cultures h~ve been characterized with respect to those of controls.
## Abstract In the blueβgreen alga __Anabaena doliolum__ heterocyst differentiation is sequential and independent of vegetative growth. Its control is photosynthetic in nature. The nature of growth curves obtained in nitrate and nitrogenβfree media indicates that the heterocyst regulates vegetative
## Abstract Growth and fixation of nitrogen were retarded in __Anabaena doliolum__ when grown on elemental nitrogen in presence of four different herbicides. The alga was found to be intolerant to these chemicals under nitrogen fixing conditions even in low concentrations. An inhibition of photosyn