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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
29/01/2016 |
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Data da última atualização: |
25/04/2017 |
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Autoria: |
LAVINSKY, A. O.; MAGALHAES, P. C.; ÁVILA, R. G.; DINIZ, M. M.; SOUZA, T. C. de. |
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Afiliação: |
PAULO CESAR MAGALHAES, CNPMS. |
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Título: |
Partitioning between primary and secondary metabolism of carbon allocated to roots in four maize genotypes under water deficit and its effects on productivity. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
The Crop Journal, v. 3, p. 379-386, 2015. |
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DOI: |
http://dx.doi.org/10.1016/j.cj.2015.04.008 |
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Idioma: |
Inglês |
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Conteúdo: |
Plants may respond to drought by altering biomass allocation to shoots and roots or by changing the metabolic activities in these organs. To determine how drought changes the partitioning of carbon allocated to growth and secondary metabolism in maize roots and how it affects photosynthesis (A) and productivity in maize, we evaluated leaf gas exchange, yield componentes, root morphology, and primary and secondary metabolites including total soluble sugars (TSS), starch (S), phenolics (PHE), and lignin (LIG). Data were collected from pot-grown plants of four maize genotypes: BRS 1010 and 2B710 (sensitive genotypes) and DKB390 and BRS1055 (tolerant genotypes) under two soil water tensions: field capacity (FC,-18 kPa) and water deficit (WD,-138 kPa). WD was applied at the pre-flowering stage for 12 days and then the water supply was restored and maintained at optimum levels until the end of the cycle. For genotype BRS 1055 under FC, the greatest A did not result in greater grain biomass (DGB) because the accumulated photoassimilates had already filled the cells, and thus the excessive TSS synthesized in leaves was allocated to roots in large amounts. However, the sharp decrease in A caused by WD imposition in this genotype did not affect the influx pressure of leaf TSS, which was due largely to conversion of primary metabolites to PHE compounds to increase the length of fine roots. In leaves of DKB390 under WD, both S and TSS were reduced, whereas PHE were increased to prevent excessive water loss and xylem cavitation. Under WD, both BRS1010 and 2B710 genotypes displayed reduced allocation of biomass to shoots and roots and LIG content in leaves, as well as lower A and DGB values. In BRS1010 this response was coupled to S decrease in leaves and TSS increase in roots, whereas in 2B710 there was a concomitant S increase in roots. MenosPlants may respond to drought by altering biomass allocation to shoots and roots or by changing the metabolic activities in these organs. To determine how drought changes the partitioning of carbon allocated to growth and secondary metabolism in maize roots and how it affects photosynthesis (A) and productivity in maize, we evaluated leaf gas exchange, yield componentes, root morphology, and primary and secondary metabolites including total soluble sugars (TSS), starch (S), phenolics (PHE), and lignin (LIG). Data were collected from pot-grown plants of four maize genotypes: BRS 1010 and 2B710 (sensitive genotypes) and DKB390 and BRS1055 (tolerant genotypes) under two soil water tensions: field capacity (FC,-18 kPa) and water deficit (WD,-138 kPa). WD was applied at the pre-flowering stage for 12 days and then the water supply was restored and maintained at optimum levels until the end of the cycle. For genotype BRS 1055 under FC, the greatest A did not result in greater grain biomass (DGB) because the accumulated photoassimilates had already filled the cells, and thus the excessive TSS synthesized in leaves was allocated to roots in large amounts. However, the sharp decrease in A caused by WD imposition in this genotype did not affect the influx pressure of leaf TSS, which was due largely to conversion of primary metabolites to PHE compounds to increase the length of fine roots. In leaves of DKB390 under WD, both S and TSS were reduced, whereas PHE were increased to prevent ... Mostrar Tudo |
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Palavras-Chave: |
Déficit hídrico. |
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Thesagro: |
Amido; Genótipo; Lignina; Milho; Raiz. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02642naa a2200253 a 4500
001 2035551
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024 7 $ahttp://dx.doi.org/10.1016/j.cj.2015.04.008$2DOI
100 1 $aLAVINSKY, A. O.
245 $aPartitioning between primary and secondary metabolism of carbon allocated to roots in four maize genotypes under water deficit and its effects on productivity.$h[electronic resource]
260 $c2015
520 $aPlants may respond to drought by altering biomass allocation to shoots and roots or by changing the metabolic activities in these organs. To determine how drought changes the partitioning of carbon allocated to growth and secondary metabolism in maize roots and how it affects photosynthesis (A) and productivity in maize, we evaluated leaf gas exchange, yield componentes, root morphology, and primary and secondary metabolites including total soluble sugars (TSS), starch (S), phenolics (PHE), and lignin (LIG). Data were collected from pot-grown plants of four maize genotypes: BRS 1010 and 2B710 (sensitive genotypes) and DKB390 and BRS1055 (tolerant genotypes) under two soil water tensions: field capacity (FC,-18 kPa) and water deficit (WD,-138 kPa). WD was applied at the pre-flowering stage for 12 days and then the water supply was restored and maintained at optimum levels until the end of the cycle. For genotype BRS 1055 under FC, the greatest A did not result in greater grain biomass (DGB) because the accumulated photoassimilates had already filled the cells, and thus the excessive TSS synthesized in leaves was allocated to roots in large amounts. However, the sharp decrease in A caused by WD imposition in this genotype did not affect the influx pressure of leaf TSS, which was due largely to conversion of primary metabolites to PHE compounds to increase the length of fine roots. In leaves of DKB390 under WD, both S and TSS were reduced, whereas PHE were increased to prevent excessive water loss and xylem cavitation. Under WD, both BRS1010 and 2B710 genotypes displayed reduced allocation of biomass to shoots and roots and LIG content in leaves, as well as lower A and DGB values. In BRS1010 this response was coupled to S decrease in leaves and TSS increase in roots, whereas in 2B710 there was a concomitant S increase in roots.
650 $aAmido
650 $aGenótipo
650 $aLignina
650 $aMilho
650 $aRaiz
653 $aDéficit hídrico
700 1 $aMAGALHAES, P. C.
700 1 $aÁVILA, R. G.
700 1 $aDINIZ, M. M.
700 1 $aSOUZA, T. C. de
773 $tThe Crop Journal$gv. 3, p. 379-386, 2015.
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| 5. |  | REZENDE, H. E. B. DE; ARAÚJO, J. L. DE B.; GOMES, P. A. C.; NUERNBERG, S.; PIMENTEL NETO, M.; OLIVEIRA, G. P. de; MELLO, R. P. DE. Notas sobre duas espécies de Lymnaea Lamark, 1799, hospedeiros intermediários de Fasciola hepática L. no estado do Rio de Janeiro (Mollusca, Gastropoda, Basommatophora, Lymnaeidae). Revista da Universidade Federal do Rio de Janeiro, Rio de Janeiro, v.3, n.1, p.21-23, 1973.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 6. | | PIMENTEL NETO, M.; NUERNBERG, S.; OLIVEIRA, G. P. de; REZENDE, H. E. B. DE; MELLO, R. P. DE; ARAÚJO, J. L. DE B.; COSTA, P. A. 'Fasciola hepática' já contamina homens e animais no estado. Jornal Fluminense, Rio de Janeiro, 20 de Marco, 1973.| Tipo: Artigo de Divulgação na Mídia |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 7. | | GOMES, P. A. C.; NUERNBERG, S.; PIMENTEL NETO, M.; OLIVEIRA, G. P. de; REZENDE, H. E. B. de; ARAUJO, J. L. de B.; MELLO, R. P. de. Biologia da Lymnaea columella say 1817 (Mollusca, Gastropoda, Basommatophora, Lymnaeidae). Arquivos Museu Nacional, Rio de Janeiro, v.55, p.67-70, 1975. Resumo.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - B |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 8. | | GOMES, P. A. C.; NUENBERG, S.; PIMENTEL NETO, M.; OLIVEIRA, G. P. de; REZENDE, H. E. B. de; ARAUJO, J. L. de B.; MELLO, R. P. de. Infecção experimental de Lymnaea columella Say, 1817, com Fasciola hepatica Linnaeus, 1758, de ocorrência no estado do Rio de Janeiro. Arquivo da Universidade Federal Rural, Rio de Janeiro, v. 4, n. 1, p. 35-38, 1974.| Tipo: Artigo em Periódico Indexado |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 9. | | ARAÚJO, J. L. B. de; NUERNBERG, S.; OLIVEIRA, G. P. de; MELO, R. P. DE; RESENDE, H. E. B. DE; PIMENTEL NETO, M.; GOMES, P. A. C. Pesquisadores acham que parasita ataca grande parte do rebanho do estado do Rio. Jornal Fluminense, Rio de Janeiro, 15 de mar., 1973.| Tipo: Artigo de Divulgação na Mídia |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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