Data/hora: 05/06/2024 02:41:43

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 03/09/1999
Data da última atualização: | 28/06/2019
Autoria: | BELTRANO, J.; RONCO, M. G.; BARREIRO, R.; MONTALDI, E. R.
Afiliação: | JOSÉ BELTRANO, Instituto de Fisiología Vegetal - INFIVE/Comisión De Investigaciones Científicas - CIC-BA; MARTA GUILLERMINA RONCO, Instituto de Fisiología Vegetal - INFIVE/Comisión De Investigaciones Científicas - CIC-BA; ROBERTO BARREIRO, Instituto de Fisiología Vegetal - INFIVE; EDGARDO RAÚL MONTALDI5, Instituto de Fisiología Vegetal - INFIVE/Consejo Nacional de Investigaciones Científicas y Técnicas - CONICET.
Título: | Plant architecture of Paspalum vaginatum Schwartz modified by nitrate and Ammonium nutrition.
Ano de publicação: | 1999
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 7, p. 1159-66, jul. 1999
Idioma: | Inglês
Notas: | Título em português: A arquitetura de Paspalum vaginatum Schwartz modificada pela nutrição de nitrato e amônio.
Conteúdo: | Paspalum vaginatum Schwartz plants were grown under greenhouse conditions in a continuos-flow hydroponic culture, containing NO3- or Nh4+ or NH4NO3 as nitrogen source. After 30 days, the size of aerial biomass and root system decreased significantly when plants were supplied with NH4+ as exclusive nitrogen source. Compared to NO3- treatment, reducing and non-reducing sugars were decreasing together with a significant increase in amino acids content. NH4+ -nutrition caused tillers to grow toward an orthogravitropic position (average angle of 60 graus with respect to the horizontal), and with NO3- -nutrtion, tillers tended to become diagravitropic (average angle of 23 graus), with NH4NO3 all the parameters measured had values in between those of the two sources. Thus, the morphologic differences among plants growing in NO3- or NH4+ nutrition confirm the hypothesis that nitrogen source determines the growth habitat of tillers in P. vaginatum by modulating the endogenous levels of reducing-non-reducing sugars.
Palavras-Chave: | Diagravitropico; Diagravitropism; Fonte de nitrogenio; Nitrogen source; Orthogravitropism; Ortogravitropico; Sucroce.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/108620/1/PLANT-ARCHITECTURE.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (11625-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS