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Microcycle conidiation and its genetic basis in Neurospora crassa

Maheshwari, Ramesh (1991) Microcycle conidiation and its genetic basis in Neurospora crassa. In: Journal of General Microbiology, 137 . pp. 2103-2115.

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Some wild isolates of Neurospora show microcycle conidiation in liquid culture under continuous agitation. Macroconidia from agar-grown mycelial cultures germinated in liquid and the germlings spontaneously produced conidia with no intervening mycelial phase. Three types of microcycle conidiation were seen among progeny of N. crassa Vickramam A x N. crassa a wild-type: (1) multinucleate blastoconidia produced by apical budding and septation, (2) multinucleate arthroconidia produced by holothallic septation and disarticulation of cells, and (3) uninucleate microconidia produced directly from conidiogenous cells of the germlings. Two genes were identified which control specific patterns of microcycle conidiogenesis. A single gene mcb in linkage group VR near al-3 (3.2% recombination) controls blastoconidiation. This gene is epistatic to gene mcm located in linkage group IIL, very near ro-7 (1.4%). mcm controls both microconidiation and arthroconidiation depending on temperature. Strains of genotype mcm produce microconidia almost exclusively at 18-22 degrees C, but arthroconidia with few or no microconidia at 30 degrees C. Because they result in rapid and synchronized conidiation in liquid culture, the two genes should be useful for studies of developmental gene regulation. mcm makes it possible to obtain large quantities of pure microconidia rapidly for experimentation.

Item Type: Journal Article
Publication: Journal of General Microbiology
Publisher: Society for General Microbiology
Additional Information: Copyright of this article belongs to Society for General Microbiology.
Keywords: Conidiophore Development;Sporulation.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 23 Nov 2010 09:46
Last Modified: 23 Nov 2010 09:46
URI: http://eprints.iisc.ac.in/id/eprint/33984

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