Nuclear behavior in homokaryotic and heterokaryotic fruiting of Thanatephorus cucumeris (Rhizoctonia solani) anastomosis group 1, subgroup IC

The soilborne plant pathogenic basidiomycetous fungus Thanatephorus cucumeris (anamorph: Rhizoctonia solani) is composed of at least 12 anastomosis groups (AG), which seem to be genetically isolated. The sexuality of T. cucumeris has been studied for several AG, revealing that AG 1 and 4 are heterok...

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Bibliographic Details
Published in:Mycologia 1997-05, Vol.89 (3), p.361-374
Main Authors: Julian, M.C. (IPO-DLO, Wageningen, The Netherlands.), Dullemans, A.M, Silfhout, C.H. van, Keijer, J
Format: Article
Language:English
Subjects:
AG-1-IC
AGENT PATHOGENE
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
APAREAMIENTO CROMOSOMICO
APPARIEMENT CHROMOSOMIQUE
BASIDIA
BASIDIOSPORES
Cell Biology/Ultrastructure
CHAMPIGNON
CHROMOSOME PAIRING
Chromosomes
CITOLOGIA
CYTOLOGIE
CYTOLOGY
DEVELOPMENTAL STAGES
ENFERMEDADES FUNGOSAS
ESPORAS FUNGICAS
ETAPAS DE DESARROLLO
FRUCTIFICACION
FRUCTIFICATION
FRUITING
Fruiting bodies
FUNGAL DISEASES
FUNGAL SPORES
FUNGI
Heterokaryon
HETEROKARYOSIS
Homokaryon
HONGOS
MALADIE FONGIQUE
MEIOSE
MEIOSIS
MITOSE
MITOSIS
MORFOGENESIS
MORPHOGENESE
MORPHOGENESIS
NOYAU CELLULAIRE
nuclear staining
NUCLEI
NUCLEO
NUCLEUS
ORGANE REPRODUCTEUR VEGETAL
ORGANISMOS PATOGENOS
ORGANOS REPRODUCTORES VEGETALES
PATHOGENS
PLANT ANATOMY
PLANT REPRODUCTIVE ORGANS
Rhizoctonia
RHIZOCTONIA SOLANI
Spore discharge
SPORE FONGIQUE
Spores
STADE DE DEVELOPPEMENT
THANATEPHORUS CUCUMERIS
ULTRAESTRUCTURA
ULTRASTRUCTURE
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Summary:The soilborne plant pathogenic basidiomycetous fungus Thanatephorus cucumeris (anamorph: Rhizoctonia solani) is composed of at least 12 anastomosis groups (AG), which seem to be genetically isolated. The sexuality of T. cucumeris has been studied for several AG, revealing that AG 1 and 4 are heterokaryotic and possess a bipolar mating system, and that AG-4 is heterothallic. To clarify whether AG-1 is also heterothallic, fruiting of heterokaryotic and homokaryotic single spore-derived isolates was studied and nuclear staining with fluorochromes was performed during fruiting. Meiosis preceding spore formation was studied for heterokaryotic and derived homokaryotic isolates. A few homokaryotic isolates did not form fruiting bodies. Most homokaryotic isolates formed basidia, but showed interrupted meiosis. A few homokaryotic isolates completed meiosis and formed viable basidiospores. The observed meiotic homokaryotic fruiting in T. cucumeris AG-1-IC differed from the mitotic homokaryotic fruiting of most other basidiomycetes. More than six chromosomes were observed. Heterokaryons formed by pairing of two nonfruiting homokaryons were able to fruit, and the amount of spores discharged by fruiting heterokaryons was 500 times higher than for fruiting homokaryons. From this it was concluded that T. cucumeris AG-1-IC is heterothallic.
ISSN:0027-5514
1557-2536
DOI:10.1080/00275514.1997.12026795