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Biblioteca(s):  Embrapa Agrobiologia.
Data corrente:  02/08/2004
Data da última atualização:  02/08/2004
Autoria:  ARAÚJO, A. P.; TEIXEIRA, M. G.
Título:  Ontogenetic variations on absorption and utilization of phosphorus in common bean cultivars under biological nitrogen fixation.
Ano de publicação:  2000
Fonte/Imprenta:  Plant and Soil, Dordrecht, v. 225, p. 1-10, 2000.
Idioma:  Inglês
Conteúdo:  An experiment was conducted to evaluate the effect of plant ontogeny on traits associated with absorption and utilization of P by common bean (Phaseolus vulgaris L.) cultivars under biological N2 fixation through plant growth analysis. Eigth cultivars were grown in pots at two levels of applied P (20 and 80 mg P kg-¹ soil) and harvested at three growth stages (third trifoliate expanded, plentiful flowering, pod setting). The development of nodulation differed among cultivars and depended on P supply; some cultivars showed an intense decline in nodule number after flowering. There were different patterns of root growth: some cultivars increased root area after flowering mainly by increasing root mass, whereas others by decreasing root radius. Despite the overall drift of reducing P influx into roots over time, some cultivars maintained P influx almost stable after flowering. Cultivars with greater root area had lower influx, whereas cultivars with smaller root area had higher influx, denoting a compensatory mechanism between root growth and P influx, such mechanism presenting ontogenetic variations associated to patterns of root area production. The cultivars differed in specific P utilization rate at low but not at high soil P level; hence P utilization seems an important physiological component for screening bean genotypes under limited P supply. High correlation between net assimilation rate and specific P utilization rate suggests that P utilization is strongly related to... Mostrar Tudo
Palavras-Chave:  Biological nitrogen fixation; BNF; Common bean; FBN; Fixação biológica de nitrogênio; Genotypes; P; Root nodulation.
Thesagro:  Feijão; Fósforo; Genética; Genótipo; Nodulação; Phaseolus Vulgaris.
Thesaurus Nal:  genetics; phosphorus.
Categoria do assunto:  --
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Agrobiologia (CNPAB)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CNPAB30402 - 1UPCSP - --0022741
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