Ascospores
Mostrando 1-12 de 127 artigos, teses e dissertações.
-
1. Fissuroma (Aigialaceae: Pleosporales) appears to be hyperdiverse on Arecaceae: evidence from two new species from southern Thailand
ABSTRACT Thailand and other tropical regions have high fungal diversity. Our investigation and examination of microfungi on palms (Arecaceae) revealed two new ascomycetous species of Fissuroma. Fissuroma arengae and F. wallichiae spp. nov. are introduced using morphological and phylogenetic evidence. The novel species have coriaceous ascomata, cylindrical-cl
Acta Bot. Bras.. Publicado em: 2020-06
-
2. Acanthothecis sarcographoides (Ascomycota: Graphidaceae), a morphologically unique, new lichen species in the Atlantic Forest of northeastern Brazil
A new species of Acanthothecis is described in the Atlantic Forest of northeastern Brazil. Unlike any other species in the genus, it has distinctly pseudo-stromatic ascomata that resemble those of the genus Sarcographa. However, its apically spinulose paraphyses, I-negative ascospores with thin endospore closely resemble those of other Acanthothecis species.
Acta Bot. Bras.. Publicado em: 2013-09
-
3. Mal-das-folhas da seringueira: dinâmica de inóculo do patógeno, progresso e danos, em três condições topográficas / South American leaf blight of rubber tree: dynamics of pathogen inoculum, progress and losses, in three topographical conditions
Brazil currently accounts for only 1.15% of the world production of natural rubber. A limiting factor on the rubber production in Brazil is the South American Leaf Blight (SALB), caused by Microcyclus ulei. Considering the lack on the knowledge on SALB, between June 2005 and December 2008 we studied the: i. dynamics of ascospores and conidia of the pathogen,
Publicado em: 2010
-
4. Análisis de Distintos Tipos de Azúcares en el Método de Extracción de Ascosporas de Monosporascus cannonballus en Suelo
The objective of this work was to test different kinds of sugar for the extraction of ascospores of M. cannonballus. The ascospores of this ascomycete involved in melon (Cucumis melo) collapse can be recovered from soil by a physical method using a gradient of sucrose (50% concentration). The use of commercial sucrose represents a high cost per sample. This
Fitopatologia Brasileira. Publicado em: 2006-04
-
5. Temporal and spatial dynamics of citrus black spot (Guignardia citricarpa) and quantification of the damages caused to citrus culture. / Dinâmica temporal e espacial da mancha preta (Guignardia citricarpa) e quantificação dos danos causados à cultura dos citros.
The fungus Guignardia citricarpa is the causal agent of citrus black spot (CBS), which is a disease that become the fruits unsightly and unsuitable for the fresh fruit market. Besides, premature fruit drop may occur, reducing the productivity. A diagrammatic scale for the two symptoms of CBS (hard spot and false melanose) was developed to evaluate the severi
Publicado em: 2004
-
6. Cytogenetic Behavior of Spore Killer Genes in Neurospora
Crosses heterozygous and homozygous for Sk-1, Sk-2 and Sk-3 were examined by light microscopy. All three Spore killers behave similarly. In heterozygous killer x sensitive crosses, meiosis and ascospore development are normal until after the second postmeiotic mitosis when four of the eight ascospores in each ascus stop developing and degenerate. The four su
-
7. Electron Micrograph Study of the Asci and Ascospores of Metschnikowia Kamienski
Internal and surface structures of asci and ascospores were studied by transmission electron microscopy (TEM) and by scanning electron microscopy (SEM) to establish the character and number of ascospores within the ascus of Metschnikowia krissii. Enzyme digestion with snail gut enzymes and SEM examination suggested the presence of a single ascospore enclosed
-
8. Simple Method for the Separation of Ascospores
A simple method for the separation of ascospores is described. To isolate single spores from adhesive ascospores and the mycelium, the suspension was sucked through a combination of sintered-glass plates with different pore sizes.
-
9. Preparation of Free Heat-Resistant Ascospores from Byssochlamys Asci
When Byssochlamys is grown for production of ascospores, some of the asci break up into their constituent ascospores, whereas others do not. For heat resistance studies, it is desirable to prepare a uniform suspension of free ascospores. This was accomplished with the aid of a pressure cell, from which a suspension of asci under high pressure was released to
-
10. Induction of petite mutations during germination and outgrowth of Saccharomyces cerevisiae ascospores.
The germination and outgrowth of Saccharomyces cerevisiae ascospores were studied by determining the sensitivity of the ascospores to the action of chemical mutagens. Survival of the ascospores after N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) treatment was low during the first 2 h of germination and then increased and remained constant. Survival of the asco
-
11. Aryl Sulfatase in Ascospores of Neurospora crassa
Neurospora crassa ascospores normally do not contain aryl sulfatase even when formed under conditions of sulfur limitation. However, when one of the parental strains is the nonrepressible mutant sconc, the resulting (mixed) ascospores contain significant levels of aryl sulfatase even when formed under conditions of sulfur abundance.
-
12. A Mutant Affecting Meiosis in Neurospora
Many mutants affecting meiosis increase the occurrence of aneuploid meiotic products. In Neurospora, mutants of this type cause ascospore abortion which is reflected by an increase in the proportion of ascospores failing to develop black pigment. The usefulness of the criterion white-ascospore-production as a signal for the presence of a mutant affecting me