PMID: 8595657Dec 1, 1995Paper

The dynamics of mitochondrial plasmids in a Hawaiian population of Neurospora intermedia

Current Genetics
F DebetsA J Griffiths

Abstract

We analysed the distribution of mitochondrial plasmids among 82 Neurospora intermedia isolates from Hawaii; 74% of the isolates carried the neutral circular plasmid Han-2, whereas 38% contained the linear senescence-causing plasmid kalDNA. The distributions of the two plasmids are independent. There is no significant difference between the Kauaian population of 1972 and that of 1976. To further examine the reasons for this frequency distribution we studied the transmission of both Hawaiian plasmids through the maternal parent in a large series of crosses using non-Kalilo isolates as conidial parents. Plasmids can be lost during the sexual cycle. The Han-2 plasmid is transmitted more efficiently than kalDNA. No clear cases of autonomous or non-autonomous plasmid suppression were observed, so loss can be considered accidental. One Kalilo strain proved to be ineffectual as a maternal parent, and this reduced its ability to transmit kalDNA to the next generation. The dynamic balance of plasmids in natural populations over time is probably a result of the interplay of many forces, including those described in this work and those from several other studies on Neurospora plasmids.

References

Jan 1, 1992·Annual Review of Genetics·A J Griffiths
Feb 1, 1990·Current Genetics·F MeinhardtK Esser
Jan 1, 1982·Canadian Journal of Genetics and Cytology. Journal Canadien De Génétique Et De Cytologie·A RieckH Bertrand
Feb 1, 1993·Molecular & General Genetics : MGG·X Yang, A J Griffiths
Jul 1, 1984·Current Genetics·A J Griffiths, H Bertrand

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Citations

May 16, 2001·Fungal Genetics and Biology : FG & B·B C TurnerA Fairfield
Feb 15, 2005·Fungal Genetics and Biology : FG & B·Marc F P M MaasAlfons J M Debets
Jun 18, 2002·Ageing Research Reviews·Heinz D Osiewacz

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