4 edition of Enzymology of nitrogen assimilation in the ectomycorrhizal fungus hebeloma crustuliniforme found in the catalog.
Enzymology of nitrogen assimilation in the ectomycorrhizal fungus hebeloma crustuliniforme
Ali Mahbub Quoreshi
Thesis (M.A.)--University of Toronto, 1993.
|Series||Canadian theses = Thèses canadiennes|
|The Physical Object|
|Pagination||2 microfiches : negative.|
Repression of extracellular protease production by ammonium is found in many fungi, including the ectomycorrhizal fungus Hebeloma crustuliniforme (Zhu et al., ). However, the protein use assays in the present and other studies cited herein were carried out in cultures from which alternate N sources had been by: Milic V, Mrkovacki N, Popovic M. Activity of nitrogen fixation and nitrogen assimilation enzymes in soybean plants inoculated with Bradyrhizobium japonicum strains. Acta Microbiol. Immunol. Hung. (). Miller AJ, Fan X, Shen Q, Smith SJ. Amino acids and nitrate as signals for the regulation of nitrogen acquisition. J. Exp.
Enteric bacteria such as Escherichia coli, Salmonella typhimurium, and their relatives regulate the expression of glutamine synthetase (GS) and other enzymes important in nitrogen assimilation in response to changes in the availability of nitrogen. In this review, the current state of knowledge about the mechanisms of signal transduction by NRI and NRII is summarized by: Zhu H, Dancik BP, Higginbotham KO. Regulation of extracellular proteinase production in an ectomycorrhizal fungus Hebeloma crustuliniforme. Mycologia. ; – Zhu H, Guo DC, Dancik BP. Purification and characterization of an extracellular acid proteinase from the ectomycorrhizal fungus Hebeloma by:
Botton B, Chalot M Nitrogen assimilation: enzymology in ectomycorrhizas. and ammonium-metabolizing enzymes (GS, NADP-GDH) in the ectomycorrhizal fungus Hebeloma cylindrosporum Freeze-fracturing for low-temperature scanning electron microscopy of Hartig net in synthesized Picea abies-Hebeloma crustuliniforme and -Tricholoma. Rapid reactions of spruce cells to elicitors released from the ectomycorrhizal fungus Hebeloma crustuliniforme, and inactivation of these elicitors by extracellular spruce cell enzymes. Planta Crossref, ISI, Google by: 2.
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Nitrogen Assimilation: Enzymology in Ectomycorrhizas. () Utilization of organic and inorganic nitrogen sources by ectomycorrhizal fungi in pure culture and in Guo DC, Dancik BP () Purification and characterization of an extracellular acid proteinase from the ectomycorrhizal fungus Hebeloma crustuliniforme.
Appl Env Microbiol Cited by: Martin F, Msatef Y, Botton B () Nitrogen assimilation in mycorrhizas. Purification and properties of the nicotinamide adenine dinucleotide phosphate-specific glutamate dehydrogenase of the ectomycorrhizal fungus Cenococcum graniforme.
New Phytol – CrossRef Google ScholarCited by: sources, suggesting a key role for these enzymes in interactions between pathways of amino acid metabolism and carbon metabolism in tbis fungus. Key words: Ectomycorrhizal fungus, growth conditions, nitrogen assimilation, enzyme regulation, Hebeloma crustuliniforme.
hand, several studies of enzyme distribution, mutantCited by: sources, suggesting a key role for these enzymes in interactions between pathways of amino acid metabolism and carbon metabolism in this fungus. Key words: Ectomycorrhizal fungus, growth conditions, nitrogen assimilation, enzyme regulation, Hebeloma crustuliniforme.
INTRODUCTION Ectomycorrhizal fungi have the enzymic potential to. Nitrogen metabolism in the ectomycorrhizal fungus Hebeloma crustuliniforme. In H. crustuliniforme, assimilation of ammonium appears to be carried out primarily via the NADPH-glutamate dehydrogenase (GDH) pathway.
Its NADPH-GDH levels in exponentially growing mycelia are several times greater than the apparent nitrogen assimilation rates of. Abstract. This study examined the role of ectomycorrhizal associations in nitrogen assimilation of Populus tremuloides seedlings.
Seedlings were inoculated with Hebeloma crustuliniforme and compared with non-inoculated plants. Nitrogen-metabolizing enzymatic properties were also determined in H.
crustuliniforme grown in sterile culture. The seedlings and fungal Cited by: 6. The complexity of regulation of nitrogen assimilation in fungi is clearly recognized in extensive studies of the three non-symbiotic fungi, Emericella (Aspergillus) nidulans, Neurospora crassa and Saccharomyces cerevisiae.
These ascomycetes, in spite of sharing common pathways of nitrogen metabolism and displaying an overriding catabolite control, exhibit distinct patterns of regulation of Cited by: This study examined the role of ectomycorrhizal associations in nitrogen assimilation of Populus tremuloides seedlings.
Seedlings were inoculated with Hebeloma crustuliniforme and compared with. The relationships between colonization of fermentation horizon organic matter (FHOM) by an ectomycorrhizal fungus and the activities of enzymes involved in key processes of nitrogen (N) and.
In addition to being a readily available source of carbon and nitrogen, amino acids are the immediate products of ammonium assimilation by ectomycorrhizal fungi. A number of recent reviews have focused on the enzymology of ammonium assimilation by ectomycorrhizal fungi [19, 20 ] and this will therefore not be dealt with in detail in this by: Ectomycorrhizal mycelium constitutes a large proportion of the microbial biomass in many forest so 39and an even higher proportion in ectomycorrhizal mat communit The ability of ectomycorrhizal fungi to degrade macromolecular nitrogen and furthermore to take up and assimilate the products of hydrolytic degradation is therefore likely to have a great influence on the dynamics Cited by: Minna J.
Kemppainen, Maria C. Alvarez Crespo and Alejandro G. Pardo, fHANT‐AC genes of the ectomycorrhizal fungus Laccaria bicolor are not repressed by l‐glutamine allowing simultaneous utilization of nitrate and organic nitrogen sources, Environmental Cited by: (Martin, ).
However, ammonium assimilation in nitrogen-starved mycelia was found to be via the NADPH-GDH pathway (Genetet et al. Furthermore, the pathways of ammonium assim-ilation in the ectomycorrhizal fungi are also influ-enced by the plant host. In the ectomycorrhizal basidiomycete, Hebeloma crustuliniforme, NADPH.
INTRODUCTION. Ectomycorrhizal trees dominate boreal and temperate forest ecosystems in which nitrogen (N) is generally accepted to be the most important growth‐limiting nutrient (7; 53).It has been proposed that selection has favoured symbiosis between the roots of trees and ectomycorrhizal fungi in these environments because the fungi improve the plants’ access to N.
Increasing awareness Cited by: Carbon availability triggers the decomposition of plant litter and assimilation of nitrogen by an ectomycorrhizal fungus. production in an ectomycorrhizal fungus Hebeloma by: Symbiosis with ectomycorrhizal (ECM) fungi is an advantageous partnership for trees in nutrient-limited environments.
Ectomycorrhizal fungi colonize the roots of their hosts and improve their access to nutrients, usually nitrogen (N) and, in exchange, trees deliver a significant portion of their photosynthetic carbon (C) to the fungi. This nutrient exchange affects key soil processes and Author: Emiko K.
Stuart, Krista L. Plett. example, in beech and ericoid mycorrhizas, nitrogen may be translocated to the host-root as glutamine since ammoniaab-sorption by mycorrhizas resulted in large accumulation ofthis amide (1, 3).
As pointed out by Harley and Smith (3), an examination ofnitrogen uptake and assimilation processes in Cited by: In mycorrhizal associations, the fungal partner assists its plant host with nitrogen and phosphorus uptake while obtaining photosynthetically fixed carbon.
Recent studies in mycorrhiza have highlighted the potential for direct transfer of ammonia from fungal to plant cells. This presents a new perspective on nitrogen transfer at the mycorrhizal interface, which is discussed here in light of Cited by: Abdel-Fattah G.
M., Mohamedin A. H., – Interactions between a vesicular-arbuscular mycorrhizal fungus (Glomus intraradices) and Streptomyces coelicolor and their effects on sorghum plants grown in soil amended with chitin of brown scales.
Biology and Fertility of Soils, Abuzinadah R. A., Read D. J., – The role of proteins in the nitrogen nutrition of ectomycorrhizal.
The role of auxin in EM formation is unclear and controversial. For example, auxin overproducers of the EM fungus Hebeloma crustuliniforme resulted in stronger EM formation, supporting the “auxin hypothesis,” which proposes that elevated auxin levels stimulate mycorrhiza formation (Gay et al., ; Barker and Tagu, ).
Carbon availability triggers the decomposition of plant litter and assimilation of nitrogen by an ectomycorrhizal fungus F Rineau, 1 F Shah, 2 M M Smits, 1 P Persson, 3 T Johansson, 2 R Carleer, 4 C Troein, 5 and A Tunlid 2, *.Soils contain a multitude of fungi with vastly divergent lifestyles ranging from saprotrophic to mutualistic and pathogenic.
The recent release of many fungal genomes has led to comparative studies that consider the extent to which these lifestyles are encoded in the genome. The genomes of the symbiotic fungi Laccaria bicolor and Tuber melanosporum are proving especially useful in Cited by: Potassium (K+) is one of the most abundant elements of soil composition but it's very low availability limits plant growth and productivity of ecosystems.
Because this cation participates in many biological processes, its constitutive uptake from soil solution is crucial for the plant cell machinery. Thus, the understanding of strategies responsible of K+ nutrition is a major issue in plant Cited by: