Data/hora: 23/06/2024 17:16:37

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 19/07/1998
Data da última atualização: | 19/07/1998
Autoria: | GAUTHIER, D. L.; DIEM, H. G.; DOMMERGUES Y. R.
Título: | Tropical and subtropical actinorhizal plants.
Ano de publicação: | 1984
Fonte/Imprenta: | Pesquisa Agropecuaria Brasileira, Brasilia, v.19, s/n, p. 119-136, jun. 1984.
Idioma: | Inglês
Conteúdo: | Most tropical countries face two major problems: increasing overexploitation of wood reserves for timber or fuel wood and diminishing soil fertility for agricultural production. The present consensus is that N2-fixing plants can help prevent the forthcoming wood and food crisis. Together with the vast group of N2-fixing Leguminoseae, actinorhizal plants (AP) can play a major role in wood production and land regeneration. AP comprise eight families of dicotyledonous plants all of which are represented in the tropics. In this paper the most promising tropical AP are briefly presented and the emphasis is put mainly on Casuarinaceae. This family forms a group of four genera (Casuarina, Allocasuarina, Gymnostoma and genus C) with 82 species, including many trees that can yield wood of good quality. The Frankia strains that have been isolated from Casuarinaceae grow slowly and are able to reduce acetylene in vitro under air, which indicates that the protection against O2 is much more efficient in Frankia than in rhizobia. Only the species belonging to the Casuarina genus could be nodulated by strain ORS 021001, isolated from Casuarina junghuhniana, suggesting the existence of cross inoculation groups within the family Casuarinaceae. N2 fixation of Casuarina equisetifolia, grown in 1 m2 microplots at the ORSTOM experimental station of Dakar, was estimated by comparing total N in non-inoculated plants and plants inoculated with Frankia strain ORS 021001. Extrapolating to 1 hectare, N2 fixation was 131 kg for a 6.5-month period. Using the N Fertilizer equivalente method, inoculation appeared to be equivalent to the application of 288 kg of N fertilizer per hectare.
Palavras-Chave: | Arvores fixadoras de N2; N2-fixing trees; Nodules; Nodulos.
Thesaurus Nal: | Frankia.
Categoria do assunto: | --
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (20042-1) - UMT - AP - -- - 630.72081 - P474 - 63072081 - DIS