Data/hora: 05/06/2024 11:00:41

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 12/03/1999
Data da última atualização: | 02/08/2019
Autoria: | PEREIRA-NETTO, A.B. de; MAGALHÃES, A. C. N. de; PINTO, H. S.
Afiliação: | ADAUCTO BELLARMINO DE PEREIRA-NETTO, Universidade Federal do Paraná - UFPR/Departamento de Botânica; ANTONIO CELSO NOVAES DE MAGALHÃES, Universidade Estadual de Campinas - UNICAMP/Departamento de Fisiologia Vegetal; HILTON SILVEIRA PINTO, Universidade Estadual de Campinas - UNICAMP/Departamento de Fisiologia Vegetal.
Título: | Nitrate reductase activity in field-grown pueraria lobata (Kudzu) in southeastern Brazil.
Ano de publicação: | 1998
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 33, n. 12, p. 1971-1975, dez. 1998.
Idioma: | Inglês
Notas: | Título em português: Atividade da redutase do nitrato em plantas de Pueraria lobata crescidas no campo, no Sudeste do Brasil.
Conteúdo: | Although Pueraria lobata (Willd.) Ohwi (P. thunbergiana) (Sieb. & Zucc.) Benth.) is thus ecologically and economically important in much to world, its physiological ecology and other factor contributing to its invasive growth are not well understood. Nitrate reductase activity (NRA) measurements have long been used to indicate the effect of changes in the environment on a plant's capacity to assimilate nitrate nitrogen. The objective of this paper was to describe how naturally occurring changes in air temperature (Ta) and solar radiation flux density (St), affect the in vivo nitrate reductase activity in field-grown P. lobata and consequently the ability of this species to assimilate nitrate nitrogen in non-native areas. A meteorological thermometer and a thermocouple pyranometer were used to measure changes in the air temperature and the solar radiation flux density, respectively. The highest nitrate reductase activity found in this study [5.8 umol NO2 h-1 (gFW)-1] was observed when Ta was 27.4 Graus C. A significant reduction in nitrate activity was observed with Ta below 21.8 Graus C. or above 33.6 Graus C. Nitrate reductase activity was linear and positively related to St. A 12% increase in nitrate reductase activity was observed when St, rose from 531 to 852 W m-2. These results suggest that P. lobata can be a successful competitor in regions located at the transition between subtropical and tropical biomes.
Palavras-Chave: | Assimiliacao de nitrato; Cover crop; Cultura de cobertura; Ecofisiologia; Nitrate assimilation.
Thesagro: | Forragem; Leguminosae.
Thesaurus Nal: | ecophysiology; forage.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/10158/1/pab020_96i.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (10158-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS