摘要:

SUMMARYFresh tissues of the pileal surface and context of 38 species in six genera (159 collections) of the Boletaceae were spot-tested with the following reagents: KOH, NH4OH, FeSO4, catechol, HCl and calcium hypochlorite. The pink to reddish color reaction of fresh pileal context tissues with KOH and NH4OH reagents distinguishSuillusspecies from other Boletaceae tested. The FeSO4tests on fresh pileal context tissues ofSuillusspecies also separate it fromBoletus, but the similarities of reactions forSuillus, Tylopilus pseudoscaber, andLeccinumspecies and the inconsistency of the reaction on manySuillusspecies indicate the need for further study. At the species level, spot tests of fresh pileal-surface tissues with KOH and NH4OH solutions helped to characterizeSuillus lakei, Boletus spadiceusandB. piperatus.Under the microscope, revived pileipellis tissues ofS. lakei, B. spadiceusandB. mirabilisgave reliable diagnostic color reactions as incrusting pigments dissolved from the cell walls in KOH and NH4OH solutions. These microscopical spot tests are useful for determination of unidentified dried collections.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020320

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYThe first exclusive taxonomic survey of the Uredinales in Nigeria is carried out. Thirty-two taxa of rust fungi are reported on ten host families collected from the Nsukka area.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020321

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYThe rate at which a variety of nematode-trapping fungi captured nematode populations in agar cultures was determined. The number of da required to capture entire populations of nematodes under various sets of conditions was considered to reflect the overall predacity of each fungus tested. Parameters such as the age of the fungal colony, the number and type of nematode added, and the ability of the fungus to form traps within the agar all affected predacity, but the extent to which each condition did so varied with the fungus tested. The total number of da required by each fungus to capture nematode populations under all the conditions tested was termed the Predatory Index (PI). The larger the PI, the less predaceous the fungus was. Comparing PIs enabled the fungi to be ranked from effectively to poorly predaceous. PI values determined in vitro may be useful for predicting which fungi will be successful predators in soil because the PI indicates how well a fungus maintains its predacity under variable conditions.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020322

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYSixteen isolates ofPhytophthorafrom cacao in 10 countries were compared for cultural, morphological, physiological, and biochemical characters. Twelve isolates were“typical”ofP. palmivoraand four were“atypical.”The typical isolates had a characteristic stellate pattern on carrot agar while the atypical isolates produced profuse aerial mycelium with no distinct pattern. Elongate, caducous sporangia tapering to the base, with long pedicels attached to the often flat bases were formed by the atypical isolates in contrast to the ovoid, caducous sporangia with short pedicels attached to the round bases produced by the typical isolates. Chlamydospores were formed by the typical but not the atypical isolates. The atypical isolates grew at 9 C on semisynthetic agar medium whereas the typical isolates did not. Two types of electrophoretic protein-band patterns were detected among the 16 isolates; one type was common to the atypical isolates and the other to the typical isolates. The typical isolates correspond to Morphological Form 1 ofP. palmivoraand the atypical isolates to Morphological Form 4. The atypical group of isolates may represent a species distinct fromP. palmivora.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020323

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYThe cellulase system ofPoronia punctatahas properties similar to that of other fungi.Poronia punctatacellulase assays on carboxymethyl cellulose (CMC) demonstrated major and minor peaks of activity atpH 4.8 and 5.6 respectively. A side peak of activity occurred atpH 4.4 but its exact nature or relationship to CMC hydrolysis is unclear.Poronia punctatacellulase assays on microcrystalline cellulose (MCC) and filter paper demonstrated reversedpH values for major and minor peaks of hydrolysis compared to the CMC experiments; the major peak of activity occurred atpH 5.5 with the minor peak atpH 4.6. These results suggest the presence of a dual enzyme system inP. punctata.Optimal temperature activities forP. punctatacellulase were demonstrated to be 55 C with CMC as substrate and 45 C with filter paper and MCC as substrates. Assays using filter paper as a substrate do not rise above 1% total conversion to reducing sugar; with MCC as substrate, approximately 2.7% is converted, and with CMC as substrate a yield of 4.7% is obtained.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020324

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020325

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020326

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020327

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020328

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020309

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor