A kalilo-like linear plasmid in Louisiana field isolates of the pseudohomothallic fungus Neurospora tetrasperma |
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| Authors: | Monica Marcinko-Kuehn Xiao Yang Fons Debets David J Jacobson Anthony J F Griffiths |
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| Institution: | (1) Department of Botany, University of British Columbia, 6270 University Boulevard, V6T 1Z4 Vancouver, B.C., Canada;(2) Department of Botany and Plant Pathology, Michigan State University, 48824-1312 East Lansing, MI, USA;(3) Present address: Biology Department, McMaster University, 1280 Main Street West, L8S 4K1 Hamilton, Ontario, Canada;(4) Present address: Department of Genetics, Agricultural University, Dreyenlaan 2, 6703 HA Wageningen, The Netherlands |
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| Abstract: | Two Louisiana strains of Neurospora tetrasperma contain a linear plasmid (LA-kalDNA) with a restriction map identical to the Hawaiian Neurospora intermedia senescence plasmid, kalDNA, but with termini 100 nucleotide pairs shorter. One of these strains also bore a circular plasmid similar to the Hawaiian circular plasmid Hanalei-2. One species probably acquired both plasmids from the other by horizontal transfer, at a time sufficiently distant for sequence divergence to take place. Many LA-kalDNA-bearing derivative strains senesced, but this plasmid does not guarantee senescence. Furthermore, LA-kalDNA does not insert into mtDNA. One senescent strain showed no LA-kalDNA. The plasmids are effectively transmitted via the pseudohomothallic sexual cycle. Single mating-type derivatives transmit plasmids maternally. |
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| Keywords: | Kalilo Plasmid Senescence Neurospora |
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