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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia. |
Data corrente: |
23/07/1997 |
Data da última atualização: |
23/07/1997 |
Autoria: |
MIRANDA, J. C. C. de. |
Título: |
Effects of soil phosphorus on vesicular-arbuscular mycorrhiza in a brazilian cerrado. |
Ano de publicação: |
1985 |
Fonte/Imprenta: |
Reading: University of Reading, Maio, 1985. |
Páginas: |
227p. |
Série: |
Tese de Doutorado. |
Idioma: |
Inglês |
Notas: |
Tese de Doutorado. Orientada por: P.J.Harris. |
Conteúdo: |
The direct effects of soil P on VA mycorrhizal fungi and VA micorrhiza development were investigated. An attempt was made to identify whether soil P or plant P is the promary factor controlling VA micorrhiza formation, by means of a split-root experiment with sorghum plants inoculated with Glomus macrocarpus and three phosphate levels. At low soil P, low plant P did not affect VA mycorrhizal root infection and external mycelium content. However, high plant P depressed root infection, but did not affect the external mycelium content to the same extent. At high soil P both parameters were similarly reduced. The direct effects of soil P on the VA endophyte Glomus macrocarpus were investigated in a cellophane-soil agar plate experiment. Spore germination and mycellium growth measured at ten different phosphate levels and three periods of incubation were independently affected by the P status of the soil. Both parameters were stimulated when 12.5 microgramas P.g-1 was applied to the soil and decreased with further soil P increments. At high soil P treatments spore germination became less sensitive to changes in P concentrations. The direct effects of soil P on different species of VA mycorrhizal fungi were also investigated. The VA endophytes, Glomus macrocarpus, Gigaspora heterogama and Glomus fasciculatus had different sensitivities to the P status of the soil. Spore germination was higher and mycelium growth more profuse for Gigaspora heterogama. However, the latter was more sensitive to phosphorus fertilization..... MenosThe direct effects of soil P on VA mycorrhizal fungi and VA micorrhiza development were investigated. An attempt was made to identify whether soil P or plant P is the promary factor controlling VA micorrhiza formation, by means of a split-root experiment with sorghum plants inoculated with Glomus macrocarpus and three phosphate levels. At low soil P, low plant P did not affect VA mycorrhizal root infection and external mycelium content. However, high plant P depressed root infection, but did not affect the external mycelium content to the same extent. At high soil P both parameters were similarly reduced. The direct effects of soil P on the VA endophyte Glomus macrocarpus were investigated in a cellophane-soil agar plate experiment. Spore germination and mycellium growth measured at ten different phosphate levels and three periods of incubation were independently affected by the P status of the soil. Both parameters were stimulated when 12.5 microgramas P.g-1 was applied to the soil and decreased with further soil P increments. At high soil P treatments spore germination became less sensitive to changes in P concentrations. The direct effects of soil P on different species of VA mycorrhizal fungi were also investigated. The VA endophytes, Glomus macrocarpus, Gigaspora heterogama and Glomus fasciculatus had different sensitivities to the P status of the soil. Spore germination was higher and mycelium growth more profuse for Gigaspora heterogama. However, the latter was more s... Mostrar Tudo |
Palavras-Chave: |
Brasil; Micorriza vesicular-arbuscular; P. |
Thesagro: |
Fertilizante; Fósforo; Solo. |
Thesaurus Nal: |
Brazil; fertilizers; phosphorus; soil; vesicular arbuscular mycorrhizae. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02307nam a2200277 a 4500 001 1621906 005 1997-07-23 008 1985 bl uuuu m 00u1 u #d 100 1 $aMIRANDA, J. C. C. de 245 $aEffects of soil phosphorus on vesicular-arbuscular mycorrhiza in a brazilian cerrado. 260 $aReading: University of Reading, Maio$c1985 300 $a227p. 490 $aTese de Doutorado. 500 $aTese de Doutorado. Orientada por: P.J.Harris. 520 $aThe direct effects of soil P on VA mycorrhizal fungi and VA micorrhiza development were investigated. An attempt was made to identify whether soil P or plant P is the promary factor controlling VA micorrhiza formation, by means of a split-root experiment with sorghum plants inoculated with Glomus macrocarpus and three phosphate levels. At low soil P, low plant P did not affect VA mycorrhizal root infection and external mycelium content. However, high plant P depressed root infection, but did not affect the external mycelium content to the same extent. At high soil P both parameters were similarly reduced. The direct effects of soil P on the VA endophyte Glomus macrocarpus were investigated in a cellophane-soil agar plate experiment. Spore germination and mycellium growth measured at ten different phosphate levels and three periods of incubation were independently affected by the P status of the soil. Both parameters were stimulated when 12.5 microgramas P.g-1 was applied to the soil and decreased with further soil P increments. At high soil P treatments spore germination became less sensitive to changes in P concentrations. The direct effects of soil P on different species of VA mycorrhizal fungi were also investigated. The VA endophytes, Glomus macrocarpus, Gigaspora heterogama and Glomus fasciculatus had different sensitivities to the P status of the soil. Spore germination was higher and mycelium growth more profuse for Gigaspora heterogama. However, the latter was more sensitive to phosphorus fertilization..... 650 $aBrazil 650 $afertilizers 650 $aphosphorus 650 $asoil 650 $avesicular arbuscular mycorrhizae 650 $aFertilizante 650 $aFósforo 650 $aSolo 653 $aBrasil 653 $aMicorriza vesicular-arbuscular 653 $aP
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registros recuperados : 74 | |
17. | | VILELA, L.; AYARZA, M. A.; MIRANDA, J. C. C. de. Agropastoral systems: activities developed by Cerrados Agricultural Research Center (Embrapa Cerrados). In: KANNO, T.; MACEDO, M.C.M., ed. JIRCAS / EMBRAPA gado de corte international joint workshop on agropastoral system in South America. [Tsukuba]: JIRCAS, 2001. p.19-33. (JIRCAS Working Report, 19). EMBRAPA-CNPGC and JIRCAS joint International Workshop on Agrospatoral System in South America, held in Campo Grande, MS, Brazil, 1999.Biblioteca(s): Embrapa Cerrados. |
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Registros recuperados : 74 | |
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