Data/hora: 05/06/2024 06:34:35

Biblioteca(s): | Embrapa Arroz e Feijão; Embrapa Soja.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - B
Data corrente: | 15/04/1992
Data da última atualização: | 17/04/2024
Autoria: | HUNGRIA, M.; RUSCHEL, A. P.
Afiliação: | MARIANGELA HUNGRIA DA CUNHA, CNPSO; ALAIDES PUPPIN RUSCHEL, CNPAF.
Título: | Acetylene reduction, hydrogen evolution and nodule respiration in Phaseolus vulgaris.
Ano de publicação: | 1989
Fonte/Imprenta: | Biology and Fertility of Soils, v. 7, n. 4, p. 351-358, 1989.
Idioma: | Inglês
Conteúdo: | In an experiment performed under greenhouse conditions, four cultivars of Phaseolus vulgaris L. (Venezuela-350; Aroana; Moruna; Carioca) were inoculated with three Rhizobium leguminosarum biovar phaseoli strains (C-05; C-40 = CIAT 255; C-89 = CIAT 55) and were fertilized with an N-free mineral nutrient solution. The plants were harvested 25, 40, and 55 days after emergence and the following paramenters were evaluated: Nitrogenase activity of nodulated roots, H2 evolution by the nodules; relative efficiency of nitrogenase; respiration rates of nodulated roots and detached nodules; dry weight and total N of stems, leaves, pods, roots, and nodules. Generally the bean cultivar, Rhizobium strain, had an effect and there was an interaction effect with both symbiotic partners, on all parameters. On average, nodules represented 23% of total root respiration but the best symbiotic combinations showed lower ratios of C respired to N fixed. The maximum N-assimilation rate (between 40 and 55 days after emergence) of 11.93 mg N plant-1 day-1 occurred with the symbiotic combination of Carioca × C-05, while the poorest rate of 0.55 mg N plant-1 day-1 was recorded with Venezuela-350 × C-89. The best symbiotic combinations always showed the highest relative nitrogenase efficiency, but the differences in N2-fixation rates cannot be explained solely in terms of conservation of energy by recycling of H2. This requires further investigation.
Palavras-Chave: | Acetylene reducion assay; Feijoeiro; Hydrogenase.
Thesagro: | Feijão; Fixação de Nitrogênio; Nitrogenase; Nitrogênio; Nodulação; Phaseolus Vulgaris; Rhizobium.
Thesaurus Nal: | acetylene; Ara; beans; nodulation.

Categoria do assunto:

F Plantas e Produtos de Origem Vegetal
X Pesquisa, Tecnologia e Engenharia

Registro original: | Embrapa Soja (CNPSO)

Exemplares:

CNPAF - (8052-1) - UPC - AP - PP - 1989 -  - 1989 - DIS
CNPSO - (13816-1) - UPC - AP - DD -  -  -  - DIS