| |
|
|
|
Registro Completo |
|
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 photosynthetic activity. Despite, the wide variation among cultivars on root growth, nodulation and rates of P absorption and utilization, the genotypic variability for total dry mass and P content was narrow by pod setting. Owing to growth constraints caused by a possible inefficient symbiosis, the concomitant selection of bean genotypes for tolerance to low P and high N2 fixation activity should prioritize traits related to the root system and to N2 fixation over total dry matter. The ontogenetic variations of traits associated with P adsorption and utilization in common bean cultivars require evaluations at different plant growth stages. MenosAn 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: |
LEADER 03040naa a2200325 a 4500
001 1626249
005 2004-08-02
008 2000 bl --- 0-- u #d
100 1 $aARAÚJO, A. P.
245 $aOntogenetic variations on absorption and utilization of phosphorus in common bean cultivars under biological nitrogen fixation.
260 $c2000
520 $aAn 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 photosynthetic activity. Despite, the wide variation among cultivars on root growth, nodulation and rates of P absorption and utilization, the genotypic variability for total dry mass and P content was narrow by pod setting. Owing to growth constraints caused by a possible inefficient symbiosis, the concomitant selection of bean genotypes for tolerance to low P and high N2 fixation activity should prioritize traits related to the root system and to N2 fixation over total dry matter. The ontogenetic variations of traits associated with P adsorption and utilization in common bean cultivars require evaluations at different plant growth stages.
650 $agenetics
650 $aphosphorus
650 $aFeijão
650 $aFósforo
650 $aGenética
650 $aGenótipo
650 $aNodulação
650 $aPhaseolus Vulgaris
653 $aBiological nitrogen fixation
653 $aBNF
653 $aCommon bean
653 $aFBN
653 $aFixação biológica de nitrogênio
653 $aGenotypes
653 $aP
653 $aRoot nodulation
700 1 $aTEIXEIRA, M. G.
773 $tPlant and Soil, Dordrecht$gv. 225, p. 1-10, 2000.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Agrobiologia (CNPAB) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Soja. |
|
Data corrente: |
28/10/2010 |
|
Data da última atualização: |
26/07/2017 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 2 |
|
Autoria: |
KUMUDINI, S.; GODOY, C. V.; KENNEDY, B.; PRIOR, E.; OMIELAN, J.; BOERMA, H. R.; HERSHMANN, D. |
|
Afiliação: |
S. KUMUDINI, Monsanto Co.; CLAUDIA VIEIRA GODOY, CNPSO; B. KENNEDY, University of Kentucky; E. PRIOR, University of Kentucky; J. OMIELAN, University of Kentuchy; H. R. BOERMA, University of Georgia; D. HERSHMANN, University of Kentucky. |
|
Título: |
Role of host-plant resistance and disease development stage on leaf photosynthetic competence of soybean rust infected leaves. |
|
Ano de publicação: |
2010 |
|
Fonte/Imprenta: |
Crop Science, Madison, v. 50, n. p. 2533-2542, nov./dec. 2010. |
|
DOI: |
10.2135/cropsci2010.01.0003 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Host-plant resistance is known to reduce fungal growth of Phakospora pachyrhizi Syd. & P. Syd., the causal agent of soybean rust (SBR) in soybean (Glycine max L. Merr.). This disease has been shown to reduce soybean leaf photosynthesis in susceptible soybean plants. Since resistant lines have reduced fungal growth, the resistance genes may protect these plants against injury to leaf photosynthesis. The objectives of this study were to determine the impact of a host-plant resistance gene and disease developmental stage on leaf photosynthesis. Two controlled-environment studies and a field experiment were conducted using genotypes resistant and susceptible to SBR. Photosynthesis was measured at the pre- and the postsporulation disease developmental stage and its quantitative impact was calculated for the genotypes. The susceptible genotypes formed tan, sporulating lesions, and the resistant genotype formed reddish-brown (RB), nonsporulating lesions. The resistant genotype reduced disease severity (measured as relative lesion area). The negative impact of SBR on leaf photosynthesis was the same for resistant and susceptible genotypes (at equivalent disease severity levels), and the pre- and postsporulation disease development stages. Since the resistant genotype formed significantly lower lesion area, the reduced disease severity and the lack of sporulation in the resistant genotype will likely minimize the impact of the disease on canopy photosynthesis and yield. |
|
Thesagro: |
Ferrugem; Fungo; Phakopsora Pachyrhizi; Praga de planta; Soja. |
|
Thesaurus NAL: |
Microbial growth; Soybean rust; Soybeans. |
|
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
|
Marc: |
LEADER 02341naa a2200301 a 4500
001 1865531
005 2017-07-26
008 2010 bl uuuu u00u1 u #d
024 7 $a10.2135/cropsci2010.01.0003$2DOI
100 1 $aKUMUDINI, S.
245 $aRole of host-plant resistance and disease development stage on leaf photosynthetic competence of soybean rust infected leaves.
260 $c2010
520 $aHost-plant resistance is known to reduce fungal growth of Phakospora pachyrhizi Syd. & P. Syd., the causal agent of soybean rust (SBR) in soybean (Glycine max L. Merr.). This disease has been shown to reduce soybean leaf photosynthesis in susceptible soybean plants. Since resistant lines have reduced fungal growth, the resistance genes may protect these plants against injury to leaf photosynthesis. The objectives of this study were to determine the impact of a host-plant resistance gene and disease developmental stage on leaf photosynthesis. Two controlled-environment studies and a field experiment were conducted using genotypes resistant and susceptible to SBR. Photosynthesis was measured at the pre- and the postsporulation disease developmental stage and its quantitative impact was calculated for the genotypes. The susceptible genotypes formed tan, sporulating lesions, and the resistant genotype formed reddish-brown (RB), nonsporulating lesions. The resistant genotype reduced disease severity (measured as relative lesion area). The negative impact of SBR on leaf photosynthesis was the same for resistant and susceptible genotypes (at equivalent disease severity levels), and the pre- and postsporulation disease development stages. Since the resistant genotype formed significantly lower lesion area, the reduced disease severity and the lack of sporulation in the resistant genotype will likely minimize the impact of the disease on canopy photosynthesis and yield.
650 $aMicrobial growth
650 $aSoybean rust
650 $aSoybeans
650 $aFerrugem
650 $aFungo
650 $aPhakopsora Pachyrhizi
650 $aPraga de planta
650 $aSoja
700 1 $aGODOY, C. V.
700 1 $aKENNEDY, B.
700 1 $aPRIOR, E.
700 1 $aOMIELAN, J.
700 1 $aBOERMA, H. R.
700 1 $aHERSHMANN, D.
773 $tCrop Science, Madison$gv. 50, n. p. 2533-2542, nov./dec. 2010.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Soja (CNPSO) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
