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Aspergillus taichungensis isolated from a soil sample collected in Taiwan is described as a new species. The new species is characterized by its restricted growth on Czapek's and malt extract agars and its white to light yellow colonies, radiate conidial heads, smooth and often diminutive conidiophores, hemispherical to elongate vesicles with biseriate aspergilla (conidiogenous cells), globose, micro-verrucose conidia and dark brown sclerotia. The species somewhat resemblesA. versicolor, A. terreus andA. flavipes, but differs in cultural and morphological details, and is considered to represent an interface species in the subgenusNidulantes. 相似文献
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Dark septate endophytic fungi (DSE) may have an important functional relationship with host plants, but these functions and
the colonization process remain unknown. We made microscopic observations of the growth of an endophytic hyphomycete in Chinese
cabbage roots to understand its colonization process. This hyphomycete was Heteroconium chaetospira, a suspected DSE. Three weeks post inoculation, some hyphae became irregularly lobed and formed microsclerotia within host
epidermal cells of healthy plants. In stunted plants, hyphae formed closely packed masses of fungal cells within host epidermal
cells, but conidiophores rarely broke through the cell walls to produce conidia.
Received: December 7, 2000 / Accepted: November 20, 2001 相似文献
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Mycopathologia - The impact of relative humidity (RH) on the infective potential of the isolate Bb INRA 297 of Beauveriabassiana (Bals.) Vuillemin (Deuteromycotina: Hyphomycetes) against first in... 相似文献
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A fungus similar to the monotypic genus Natarajania, isolated from
dead wood and collected in Thailand, is reported. Analysis of partial ribosomal
LSU and a protein coding gene (RPB2) demonstrated that the new isolate belonged
to Stilbosporaceae, Diaporthales and genetically different from N. indica. It is
unique in producing synnematous conidiophores, smooth-walled conidiogenous
cells and a flared collarette but lacks an elongated collar-canal which is distinct
in the type species. Therefore, sequence data and morphological traits are used to
introduce the new species, Natarajania thailandica. 相似文献
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The detrimental effect of solar radiation on the survival of conidia of the entomopathogenic fungusPaecilomyces fumoroseus was studied by monitoring germinability and ability to form colonies (CFU) of conidia irradiated at two temperatures, 25 and 35 °C, harmless to shaded conidia. There was no apparent effect when spores were exposed to a high level of artificial radiation (0.66 W m–2 UVB). However, at a lower level of irradiance (0.33 W m–2), effects of radiation occurred more quickly at 35 °C than at 25 °C. Under natural solar radiation, the rate of decrease in germinability or viability was doubled at 35 °C as compared to 25 °C, indicating an interaction between temperature and radiation effects under natural conditions. This interaction was not detected in indoor experiments, indicating that the spectral distribution of UV radiation has to be taken in account as well as its irradiance when studying its effects.Abbreviations CFU
Colony Forming Units
- UTC
Universal Time Coordinates
- UVB
Ultra Violet B radiation (280–320 nm) 相似文献
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T. M. Butt M. Barrisever J. Drummond T. H. Schuler F. T. Tillemans N. Wilding 《Biocontrol Science and Technology》1992,2(4):327-334
Susceptibility of the mustard beetle (Phaedon cochleariae) and the cabbage stem flea beetle (Psylliodes chrysocephala) to six isolates of the entomogenous, hyphomycete fungus Metarhizium anisopliae, was investigated. A farther six isolates were assayed against P. cochleariae only. The isolates originated from hosts of various insect orders. Five of the six isolates tested against P. chrysocephala and P. cochleariae were infective for both species whereas one isolate, V107, was non‐pathogenic to both. The level of virulence of different M. anisopliae isolates for these chrysomelid beetles varied considerably. Isolates V90 and V93 were highly virulent to P. chrysocephala and P. cochleariae respectively but were significantly less virulent against the alternate host species. The LT50 of isolate V90 for P. chrysocephala was 7 days at 4 x 107 conidia/ml and its LC50 value was 16 x 105 conidia/ml. The LT50 of V93 for P. cochleariae was approximately 8 days at 4 X 108 conidia/ml and its LC50 value was 3 x 107 conidia/ml. Following inoculation, germinating conidia of all isolates produced appressoria on the cuticular surface of both hosts suggesting that specificity is determined at later stages of infection. 相似文献
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Amlie Truchy Romain Sarremejane Timo Muotka Heikki Mykr David G. Angeler Kaisa Lehosmaa Ari Huusko Richard K. Johnson Ryan A. Sponseller Brendan G. McKie 《Global Change Biology》2020,26(6):3455-3472
Ongoing climate change is increasing the occurrence and intensity of drought episodes worldwide, including in boreal regions not previously regarded as drought prone, and where the impacts of drought remain poorly understood. Ecological connectivity is one factor that might influence community structure and ecosystem functioning post‐drought, by facilitating the recovery of sensitive species via dispersal at both local (e.g. a nearby habitat patch) and regional (from other systems within the same region) scales. In an outdoor mesocosm experiment, we investigated how impacts of drought on boreal stream ecosystems are altered by the spatial arrangement of local habitat patches within stream channels, and variation in ecological connectivity with a regional species pool. We measured basal ecosystem processes underlying carbon and nutrient cycling: (a) algal biomass accrual; (b) microbial respiration; and (c) decomposition of organic matter, and sampled communities of aquatic fungi and benthic invertebrates. An 8‐day drought event had strong impacts on both community structure and ecosystem functioning, including algal accrual, leaf decomposition and microbial respiration, with many of these impacts persisting even after water levels had been restored for 3.5 weeks. Enhanced connectivity with the regional species pool and increased aggregation of habitat patches also affected multiple response variables, especially those associated with microbes, and in some cases reduced the effects of drought to a small extent. This indicates that spatial processes might play a role in the resilience of communities and ecosystem functioning, given enough time. These effects were however insufficient to facilitate significant recovery in algal growth before seasonal dieback began in autumn. The limited resilience of ecosystem functioning in our experiment suggests that even short‐term droughts can have extended consequences for stream ecosystems in the world's vast boreal region, and especially on the ecosystem processes and services mediated by algal biofilms. 相似文献
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A new species ofAspergillus, A. salviicola, has been isolated from Turkish sage, an imported spice in Japan. The species, characterized by white to rosy buff conidial heads, pinkish smooth-walled conidiophores, large biseriate aspergilla, globose smooth-walled conidia, absence of sclerotia and thermotolerant growth, is considered to represent an interface species in the subgenusCircumdati. 相似文献