## Abstract Effects of UV radiation on the morphogenesis of __Anabaena doliolum__ are described. After irradiation the frequencies of the 2nd and 3rd cells in 4โcelled filaments differentiating into a heterocyst increase markedly. The spatial relations between successive heterocysts of the series i
Physiology of heterocyst production in the blue-green alga Anabaena doliolum I. Nitrate and light controls
โ Scribed by Dr. H. N. Singh; H. D. Kumar
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 398 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0233-111X
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โฆ Synopsis
Abstract
In the blueโgreen 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 nitrogenโfree media indicates that the heterocyst regulates vegetative growth but has no role in sporulation. The formation of the first heterocyst is determined at a certain stage during the development of a 2โcelled germling into a 4โcelled filament.
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## Abstract Chains of multiple heterocysts form in __Anabaena__ und __Calothrix__ filaments on treatment with rifampicin. The multiple heterocysts form irrespective of whether the rifampicin treatment is given in combined nitrogenโfree or supplemented medium. This suggests the possibility of involv