ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020226

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020227

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020228

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYThirty-two species of wood-rotting fungi were found on windthrown ocotillo plants in the Sonoran Desert of southern Arizona. Twenty-seven of these were isolated and their cultural morphology determined. All are homobasidiomycetes exceptXylaria hypoxylon.All caused white rots exceptPanus fulvidus. Cristinia sonoraeandHyphoderma fouquieriaeare described as new species. Standard agar block decay tests with ocotillo wood showed wide variation in decay capabilities of the 27 fungi.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020229

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYMelanospoa zamiaewas shown to be a biotrophic contact mycoparasite. It produced hook-shaped branches when contact was made with host hyphae. The hook-shaped branches completely or partially surrounded the host hyphae but did not invade the host cell. The parasite was able to obtain all nutrients necessary for growth and sporulation from washed living mycelia of host fungi separated from the culture medium. The required nutrients were held within the host mycelium and were not excreted into the culture medium. The host range included eleven species of Ascomycetes and Deuteromycetes.Melanospora zamiaewas deficient for thiamine and biotin but not the growth factor mycotrophein, which it synthesized. The addition of zinc to a glucose 10-casein hydrolysate 2 liquid medium supplemented with thiamine and biotin was required for maximum axenic growth and sporulation. D-glucose, D-fructose, D-mannose and cellobiose were the best sources of carbon. The nitrogen sources casein hydrolysate, L-asparagine, L-aspartic acid, L-alanine, L-glutamic acid and urea were utilized to the greatest degree.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020230

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYFour metabolic inhibitors were tested for their ability to interfere with aflatoxin release at concentrations which did not inhibit growth ofAspergillus flavusin synthetic media as indicated by mycelial dry weight determinations. The amount of aflatoxin B1released in cultures incubated with either N,N-dicyclohexylcarbodiimide or sodium azide was markedly lower than in control cultures. Toxin release was inhibited to a smaller degree by potassium cyanide and 2,4-dinitrophenol at the levels tested. Presence of the latter two inhibitors resulted in a delay of time when peak levels of toxin were released into media. Mycelial extracts from cultures incubated in the presence of N,N-dicyclohexylcarbodiimide contained higher amounts of aflatoxin than did extracts from controls. The results suggest that an energy-dependent transport system is involved in the release of aflatoxins fromAspergillus flavus.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020231

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYMikronegeria albaonNothofagus(Fagaceae) species in Chile and Argentina has as its gametophytic stateCaeoma espinosaeonAustrocedrus(Cupressaceae). Lack of spore pigment, morphological details, and distinctly different aecial stages separateM. albafrom the sympatricM. fagi, also onNothofagus. Mikronegeriais difficult to classify; it may display more“primitive”characteristics than other heteroecious genera of Uredinales.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020232

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYTwo new species in theAspergillus nidulansgroup are described and compared with known related taxa.Aspergillus spectabilis, with tall conidiophores, broad green conidial columns and early-ripening cleistothecia shallowly embedded in a vinaceous Hülle-cell crust, may be most closely related toA. multicolor, A. crustosus(both nonascosporic),A. striatusandEmericella desertorum. Aspergillus bicoloris distinctive among all other recognized species in the complex in its development of tall conidiophores and columnar green heads on dilute media and in its production on malt agar of a floccose yellow felt which forms vinaceous Hülle-cell-cleistothecium aggregations aerially after growth for 4–6 wk. Ascospores in the latter species are produced sparingly, mature at 2–3 mo, are orange red, smooth or delicately roughened and have very low equatorial crests.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020233

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYThe sporulation ofExserohilum(=Helminthosporium)rostratumoccurred in the dark at temperatures from 28 to 34 C. Light induced sporulation at lower temperatures, enhanced sporulation at 28 and 31 C, but inhibited the terminal phase of sporulation at 34 C. In dark-grown cultures, spores were characteristically elliptical and spore length increased with temperature to 31 C. Under continuous light, characteristic rostrate spores were formed at all temperatures tested, spore size increasing with temperature to 24 C, and then decreasing slightly with further temperature increases to 31 C. At 24 C, length of spores formed under continuous fluorescent irradiation was more than three times those formed in the dark. Under alternating light and dark conditions, both elliptical and rostrate conidia were formed as well as an intermediate, cylindrical spore type. Sporulation and spore length increased with light intensity. Added glucose (up to 4%) in vegetable-juice agar tended to shorten spores in light-grown culture.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020234

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SUMMARYThe potential use of certain metabolites and pigments in the classification of species in the genusNectriawas studied. Eleven species ofNectriawere used:N. aquifolii, N. cinnabarina, N. coryli, N. gliocladioides, N. peziza, N. ochroleuea, N. sporangiicola, N. candicans, N. episphaeria, N. lacteaandN. purtonii.Two to four compounds were obtained from all but the last five species. The substances were unique to one species but some species appeared to have a chromophore in common. Preliminary separation and characterization of these compounds was achieved by countercurrent distribution and visible and UV spectrophotometry.

ISSN:0027-5514    

DOI:10.1080/00275514.1978.12020235

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor