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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
16/07/1991 |
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Data da última atualização: |
27/01/2025 |
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Autoria: |
THOMAS, B. D.; CLARKSON, D. T.; BRAIN, P. |
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Título: |
Kinetics of phosphorus uptake by the germ-tubes of the vesicular arbuscular mycorrhizal fungus Gigaspora-margarita. |
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Ano de publicação: |
1990 |
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Fonte/Imprenta: |
New Phytologist, v. 116, n. 4, p. 647-654, 1990. |
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Idioma: |
Inglês |
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Conteúdo: |
We characterized kinetically the phosphorus (P) transport systems present in the germ-tubes of the vesicular-arbuscular (VA) mycorrhizal fungus, Gigaspora margarita Becker & Hall. Germinated spores of G. margarita were grown without P or with 1000 μM P for 10 d. The rate of P uptake by these spores and their associated germ-tubes was measured at external P concentrations ranging from 1 to 10000 μM and in the presence or absence of an uncoupler of oxidative phosphorylation. Two transport systems for P were identified in the germ-tubes of G. margarita grown without P. System I, an active high affinity system with a Km of 1.8–3.1 μM and a Vmax of 3.1–3.6 nmol mg protein−1h−1and System II, a passive low affinity system with a Km of 10200–11 300 μM and a Vmax of 445–895 nmol mg protein−1h−1. These two systems operated simultaneously at concentrations of P ranging from 1 to 10000 μM. Two transport systems for P were also identified in the germ-tubes of G. margarita grown with 1000 μM P. The Km of System I in these germ-tubes (13.4 μM) was increased relative to the Km of System I in germ-tubes grown without P. There was also evidence to suggest that the Km of System II was increased in germ-tubes grown with 1000 μM P. The values of Km and Vmax for the P transport systems in the germ-tubes of G. margarita are similar to those observed in the hyphae of other fungi and in plant roots. |
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Thesagro: |
Fósforo; Micorriza Vesicular Arbuscular. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01961naa a2200169 a 4500
001 1279584
005 2025-01-27
008 1990 bl uuuu u00u1 u #d
100 1 $aTHOMAS, B. D.
245 $aKinetics of phosphorus uptake by the germ-tubes of the vesicular arbuscular mycorrhizal fungus Gigaspora-margarita.$h[electronic resource]
260 $c1990
520 $aWe characterized kinetically the phosphorus (P) transport systems present in the germ-tubes of the vesicular-arbuscular (VA) mycorrhizal fungus, Gigaspora margarita Becker & Hall. Germinated spores of G. margarita were grown without P or with 1000 μM P for 10 d. The rate of P uptake by these spores and their associated germ-tubes was measured at external P concentrations ranging from 1 to 10000 μM and in the presence or absence of an uncoupler of oxidative phosphorylation. Two transport systems for P were identified in the germ-tubes of G. margarita grown without P. System I, an active high affinity system with a Km of 1.8–3.1 μM and a Vmax of 3.1–3.6 nmol mg protein−1h−1and System II, a passive low affinity system with a Km of 10200–11 300 μM and a Vmax of 445–895 nmol mg protein−1h−1. These two systems operated simultaneously at concentrations of P ranging from 1 to 10000 μM. Two transport systems for P were also identified in the germ-tubes of G. margarita grown with 1000 μM P. The Km of System I in these germ-tubes (13.4 μM) was increased relative to the Km of System I in germ-tubes grown without P. There was also evidence to suggest that the Km of System II was increased in germ-tubes grown with 1000 μM P. The values of Km and Vmax for the P transport systems in the germ-tubes of G. margarita are similar to those observed in the hyphae of other fungi and in plant roots.
650 $aFósforo
650 $aMicorriza Vesicular Arbuscular
700 1 $aCLARKSON, D. T.
700 1 $aBRAIN, P.
773 $tNew Phytologist$gv. 116, n. 4, p. 647-654, 1990.
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| 1. |  | SILVA, I. O. e; VASCONCELOS, R. B.; CAETANO, J. V. O.; GULART, L. V. M.; CAMARGO, L. S. de A.; BÁO, S. N.; SILVA, A. A. M. R. e. Induction of reversible meiosis arrest of bovine oocytes using a two-step procedure under defined and nondefined conditions. Theriogenology, v. 75, n. 6, p. 1115-1124, 2011.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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