The constitution of incompatibility factor and mating characteristics of spore isolates in a bipolar mushroom, <Emphasis Type="Italic">Pholiota nameko</Emphasis> |
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Authors: | S Ratanatragooldacha C Hui Y Kitamoto A Kumata |
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Institution: | (1) Department of Biochemistry and Biotechnology, Faculty of Agriculture, Tottori University, 4-101 Koyamacho Minami, Tottori 690-0945, Japan Tel. +81-857-31-5371; Fax +81-857-31-5371 e-mail: kitamoto@muses.tottori-u.ac.jp, JP;(2) Fukushima Prefecture, Forest Research Center, Koriyama, Japan, JP |
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Abstract: | Pholiota nameko is a wood-rotting edible mushroom that carries a bipolar A incompatibility factor gene. The linkage analysis of the multiple allelomorphic A factor gene demonstrated that sexual reproduction produced a monospore isolate carrying a new A factor gene in addition to two parental mating types of isolates. However, 10%–30% of the modified monospore isolates could
not produce a dikaryon with both of the parental monokaryons by crossing. It is concluded that the bipolar A incompatibility factor gene of P. nameko is constituted of two functional subunits, Aα and Aβ, which might be successively located beside each other with an apparent genetic distance of 0.3 centi-Morgan between them
on the same chromosome. Further, some monospore isolates that did not conjugate with both parental monokaryons could produce
dikaryons with different monokaryotic stocks with either one of the parental mating types. This result suggests that the crossing
capability of these isolates were essentially those for one of the mating types of the parental monokaryons, but that their
function for mating activity was made partially by unequal crossing-over in the process of sexual recombination.
Received: May 1, 2001 / Accepted: December 5, 2001 |
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Keywords: | Basidiomycete Bipolar mating system Incompatibility factor Linkage analysis Pholiota nameko |
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