| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Plant architecture of Paspalum vaginatum schwartz modified by nitrate and ammonium nutrition
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| Autores: |
Beltrano,José
Ronco,Marta Guillermina
Barreiro,Roberto
Montaldi,Edgardo Raúl
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| Data: |
1999-07-01
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| Ano: |
1999
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| Palavras-chave: |
Nitrogen source
Orthogravitropism
Diagravitropism
Sucrose
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| Resumo: |
Paspalum vaginatum Schwartz plants were grown under greenhouse conditions in a continuous-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 68° with respect to the horizontal), and with NO3--nutrition, tillers tended to become diagravitropic (average angle of 23°). With NH4NO3 all the parameters measured had values in between those of the other two sources. Thus, the morphologic differences among plants growing in NO3- or NH4+ nutrition confirm the hypothesis that nitrogen source determines the growth habit of tillers in P. vaginatum by modulating the endogenous levels of reducing-non-reducing sugars.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000700007
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.34 n.7 1999
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| Direitos: |
info:eu-repo/semantics/openAccess
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