摘要:

The organization of the Hartig net in the mature state was studied in mycorrhizas ofAmanita muscaria(Pers. ex. Fries) Hook.Picea abies(L.) Karst. grown in vitro. The tips of the fan‐like branched hyphae contain dense cytoplasm with a large number of mitochondria and rER frequently stretched in the direction of the hyphal growth, indicating that active transfer of solutes between host and fungus is localized here. Lack of septation of the hyphae and their intimate juxtaposition, leaving no space in between, result in a coenocytic, transfer cell‐like structure of the Hartig net. The multinucleate status of the cells is shown. The advantage of this organization for nutrient exchange between host and fungus and for nutrient transport within the hyphal system is discus

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00919.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00920.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Seventy isolates of moulds and blue stain fungi (ZygomycotaandDeuteromycota), isolated from discoloured outdoor softwood in Sweden, comprising of 27 different species, (the two largest generaPenicilliumandCladosporium) were investigated for their linear growth at three different start‐pH values (5, 7 and 9.5) at two temperatures (2°C and 24°C) on malt extract agar (MEA). At 24°C all isolates showed growth at all three start‐pH values except for one isolate which did not grow at initial‐pH 9.5. After 21 days at 2°C at the three start pH‐values, only six isolates showed no growth indicating that 64 of the isolates were cold‐tolerant (psychrotrophic). Of these 64 strains, 58 showed growth at an initial pH of 9.5. Lower pH optima at 2°C than at 24°C were found for most of the isolates. The reduction of the linear growth at initial pH 9.5 in relation to the growth at optimal pH was more pronounced (higher) at the

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00921.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

The genusSynurawas found to be an important member of the phytoplankton communities in many Connecticut lakes, present in more than fifty percent of the 113 collections made during 1984. Thirteen taxa, including a new forma,Synura peterseniif.truttae, were recorded for the first time in Connecticut waters using SEM.S. peterseniiwas the most important species, present in forty‐one percent of the samples. Evidence for denotingS. peterseniivar.glabraas a form, instead of a variety, is presented. Ecological preferences for some species are discusse

ISSN:0107-055X    

DOI:10.1111/j.1756-1051.1987.tb00922.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY