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Titolo:
RELATIONS OF LEUCOPAXILLUS-GIGANTEUS, BASIDIOMYCETE OF FAIRY RINGS, WITH SOIL MICROFLORA AND GRASSLAND PLANTS
Autore:
KAISER P;
Indirizzi:
INA PG F-78850 THIVERVAL GRIGNON FRANCE
Titolo Testata:
Cryptogamie. Mycologie
fascicolo: 1-2, volume: 19, anno: 1998,
pagine: 45 - 61
SICI:
0181-1584(1998)19:1-2<45:ROLBOF>2.0.ZU;2-C
Fonte:
ISI
Lingua:
FRE
Soggetto:
FUNGI;
Keywords:
LEUCOPAXILLUS GIGANTEUS; SOIL BIOCHEMISTRY AND MICROBIOLOGY; PHANEROGAMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
P. Kaiser, "RELATIONS OF LEUCOPAXILLUS-GIGANTEUS, BASIDIOMYCETE OF FAIRY RINGS, WITH SOIL MICROFLORA AND GRASSLAND PLANTS", Cryptogamie. Mycologie, 19(1-2), 1998, pp. 45-61

Abstract

Leucopaxillus giganteus developped as fairy rings in an acid grassland. According to the climatic conditions the spreading of the fairy ring ranged from 25 to 60 cm each year and occured at the end of the winter and the early spring. Fructification occured between september and october. Mycelium grew around the stolons and the roots of the grassand plants which were destroyed. The pH of the invaded soil raised due to a high ammonia level but the content of organic carbon and the CM ratio was lowered. The Leucopaxillus mycelium enhanced the mineralization of organic carbon and nitrogen, the decomposed organic matter was partially humified. Concerning enzymatic activities of the invaded soil a decrease of the urease and an enhancement of the desaminases and pectinases activities was noticed. Supplementation in glucose or reducingsugars from root exsudates specifically stimulated the oxygen uptake of the invaded soil. In the latter the moulds were in great part eliminated but the number of the other soil microorganisms was only weakly affected. In vitro the Leucopaxillus mycelium inhibited the growth of bacteria and actinomycetes but not the moulds. Mycelium growth of Leucopaxillus on sterile and non sterile soil showed that the microflora exerted a strong inhibitory action against the Leucopaxillus. The inhibition diminished at low temperature. In pure culture Leucopaxillus mycelium developped well at +4 degrees C whereas the major part of mouldsand bacteria did not. It appeared that the Leucopaxillus needed two conditions for growth in soil :A biological void and an adapted nutrient. Low temperatures of the winter create the biological void. Root exsudates and bacterial polysaccharides of the roots could be the nutrient. In vitro the Leucopaxillus developped on bacterial mats but not on mould mats. It used well semi-synthetic media for growth. Best nitrogen sources were peptones, numerous simple sugars and polysaccharides could be used.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 08:14:19