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- Title
MUTAGENESIS AND ISOLATION OF MORPHOLOGICAL MUTANTS IMPAIRED IN NITROGEN-FIXING CAPACITY FROM A CYANOBACTERIUM GLOEOTRICHIA GHOSEI.
- Authors
Mishra, A. K.; Tiwari, D. N.
- Abstract
Ultraviolet (u.v.) irradiation and treatment with nitrosoguanidine (NTG) were used to produce mutants of the cyanobacterium Gloeotrichia ghosei. Three non-nitrogen fixing (nif[SUP-]) mutants, which were also altered in their morphological characteristics, were isolated. They were designated as fil[SUP1] het[SUP+], fil[SUP1] het[SUP++] and pol[SUP-] het[SUP-]. The first two mutants formed heterocysts and exhibited polarity while the third (i.e. pol[SUP-] het)[SUP-] had neither heterocysts nor polarity. The fil[SUP1] het[SUP+] strain had a developmental pattern similar to that of the parent alga, but with longer filaments, while the fil[SUP1] het[SUP++] strain formed chains of intercalary heterocysts and the long filaments showed evidence of intercalary polarity. The isolation of these mutants demonstrates the feasibility of using Gloeotrichia to relate developmental morphology to nitrogen fixation and heterocyst differentiation in a filamentous cyanobacterium.
- Subjects
CYANOBACTERIA; NITROGEN fixation; ULTRAVIOLET radiation; NITROGUANIDINE; MUTAGENESIS; NITROGEN-fixing microorganisms; PLANT morphology
- Publication
New Phytologist, 1986, Vol 103, Issue 1, p69
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.1986.tb00597.x