Bipolar incompatibility system of an ectomycorrhizal basidiomycete, Rhizopogon rubescens.

Abstract:

:The mating systems of most ectomycorrhizal fungi have not been elucidated because of two reasons. One is the difficulty of obtaining homokaryotic isolates for mating tests caused by the low germination rate of basidiospores, and another is the difficulty of checking dikaryotization caused by the absence or inconsistent production of clamp connections on heterokaryotic mycelia under laboratory conditions. Basidiospore germination of a few ectomycorrhizal fungi has been induced by living roots of their host plants. Based on this information, we examined methods to obtain homokaryotic isolates of Rhizopogon rubescens using its host plant, Pinus thunbergii. The basidiospores of R. rubescens appeared to germinate well on an agar plate, on which axenic pine seedlings were grown in advance to induce germination, even when the seedlings were removed from the plate at the time of spore inoculation. To enhance the production rate of clamp connections on the heterokaryotic mycelia of R. rubescens, the culture medium composition was modified. The pH of the medium was critical for the production of clamp connections, and the optimal pH was higher for the production of clamp connections than for mycelial growth. These findings made it possible to conduct mating tests, and we found that the mating system of R. rubescens is bipolar with a multiallelic mating type factor.

journal_name

Mycorrhiza

journal_title

Mycorrhiza

authors

Kawai M,Yamahara M,Ohta A

doi

10.1007/s00572-008-0167-4

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

205-210

issue

4

eissn

0940-6360

issn

1432-1890

pii

10.1007/s00572-008-0167-4

journal_volume

18

pub_type

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