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A p21-Activated Kinase Is Required for Conidial Germination in Penicillium marneffei: ... fungi, and the capacity to sense the host environment and trigger conidial germination is a key pathogenicity determinant. Germination of conidia requires the de novo establishment of a polarised growth axis and consequent germ tube extension. The molecular mechanisms that control polarisation during germination are poorly understood. In the dimorphic human pathogenic fungus Penicillium marneffei , conidia germinate to produce one of two ...

Kylie J Boyce et al.

PLoS Pathogens , 01 Nov 2007

Release of sunflower seed dormancy by cyanide: cross-talk with ethylene signalling pathway: ... seeds are considered to be dormant because they fail to germinate at relatively low ...

Krystyna Oracz et al.

Journal of Experimental Botany , 01 Mai 2008

RNR1, a 3′–5′ exoribonuclease belonging to the RNR superfamily, catalyzes 3′ maturation of chloroplast ribosomal RNAs in Arabidopsis thaliana: ... contain at least two 3′ to 5′ exoribonucleases, polynucleotide phosphorylase (PNPase) and an RNase R homolog (RNR1). PNPase has been implicated in both mRNA and 23S rRNA 3′ processing. However, the observed maturation defects do not affect chloroplast translation, suggesting that the overall role of PNPase in maturation of chloroplast rRNA is not essential. Here, we show that this role can be largely ascribed to RNR1, for which homozygous mutants germinate only on ...

Thomas J. Bollenbach et al.

Nucleic Acids Research , 2005

Primary Involvement of Pharynx and Peyer's Patch in Inhalational and Intestinal Anthrax: ... report that, contrary to the current view of B. anthracis pathogenesis, B. anthracis spores germinate and establish ...

Ian J Glomski et al.

PLoS Pathogens , 01 Jun 2007

Cell cycle and cell death are not necessary for appressorium formation and plant infection in the fungal plant pathogen Colletotrichum gloeosporioides: Background In order to initiate plant infection, fungal spores must germinate and penetrate into the ...

Iris Nesher et al.

BMC Biology , 14 Feb 2008

Phospholipase Cδ regulates germination of Dictyostelium spores: ... that PLC is essential to sense the environment of food-activated spores. Results Plc -null spores germinate at alkaline pH, reduced ...

Peter Van Dijken et al.

BMC Cell Biology , 05 Dez 2001

Effects of fire and fire intensity on the germination and establishment of Acacia karroo , Acacia nilotica , Acacia luederitzii and Dichrostachys cinerea in the field: ... used in some instances to control the increase of woody plants, it has also been reported that fire may cause an increase in certain fire-tolerant Acacia tree species. This study investigated germination of Acacia karroo , A. luederitzii and Dichrostachys cinerea , thought to be increasing in density, as well as the historically successful encroaching woody species, A. nilotica, in savanna grassland, Hluhluwe-iMfolozi Park, South Africa. A. karroo is thought to be replacing A. nilotica as the dominant microphyllous species in the park. We tested the hypothesis that observed increases in certain woody plants in a savanna were related to seed germination and seedling establishment. Germination is compared among species for burnt and unburnt seeds on burnt and unburnt plots at three different locations for both hot and cool fires. Results Acacia karroo showed higher germination ( A. karroo 5.1%, A. nilotica 1.5% and A. luederitzii 5.0%) levels and better establishment ( A. karroo 4.9%, A. nilotica 0.4% and A. luederitzii 0.4%). Seeds of the shrub Dichrostachys cinerea did not germinate in the field after fire ...

Michele Walters et al.

BMC Ecology , 07 Apr 2004

ISSR and AFLP analysis of the temporal and spatial population structure of the post-fire annual, Nicotiana attenuata , in SW Utah: ... pattern is due to its unusual germination behavior. Ephemeral populations are produced by the germination of dormant seeds from long-lived seed banks which are stimulated to germinate by a combination of ...

Rahul A Bahulikar et al.

BMC Ecology , 06 Sep 2004

Phagocytosis of Aspergillus fumigatus conidia by primary nasal epithelial cells in vitro: ... conidia were compared to Penicillium chrysogenum conidia, a mould that is rarely responsible for invasive disease. Confocal microscopy, transmission electron microscopy, and anti-LAMP1 antibody labeling studies showed that conidia of both species were phagocytosed and trafficked into a late endosomal-lysosomal compartment as early as 4 h post-infection. In double immunolabeling experiments, the mean percentage of A. fumigatus conidia undergoing phagocytosis 4 h post-infection was 21.8 ± 4.5%. Using combined staining with a fluorescence brightener and propidium iodide, the mean rate of phagocytosis was 18.7 ± 9.3% and the killing rate 16.7 ± 7.5% for A. fumigatus after 8 h. The phagocytosis rate did not differ between the two fungal species for a given primary culture. No germination of the conidia was observed until 20 h of observation. Conclusion HNEC can phagocytose fungal conidia but killing of phagocytosed conidia is low, although the spores do not germinate. This phagocytosis does ...

Françoise Botterel et al.

BMC Microbiology , 18 Jun 2008

Topoisomerase III is essential for accurate nuclear division in Schizosaccharomyces pombe.: ... sequence similarity to genes encoding topoisomerase III enzymes in other eukaryotic species. In common with murine TOP3 alpha, but in contrast to Saccharomyces cerevisiae TOP3, the S.pombe top3 (+)gene is essential for long-term cell viability. Fission yeast haploid spores containing a disrupted top3 (+)gene germinate successfully, but then ...

A Goodwin et al.

Nucleic Acids Research , 15 Okt 1999