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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
14/11/2016 |
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Data da última atualização: |
14/11/2016 |
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Autoria: |
SOUZA, I. R. P. de; MACADAM, J. W. |
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Afiliação: |
ISABEL REGINA PRAZERES DE SOUZA, CNPMS; Jennifer W. MacAdam, Utah State University. |
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Título: |
Gibberellic acid and dwarfism effects on the growth dynamics of B73 maize (Zea mays L.) leaf blades: a transient increase in apoplastic peroxidase activity precedes cessation of cell elongation. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Journal of Experimental Botany, London, v. 52, n. 361, p. 1673-1682, Aug. 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
The relationship between apoplastic peroxidase (EC 1.11.1.7) activity and cessation of growth in maize) Zea mays L.) leaf blades was investigated by altering elongation zone length. Apoplastic peroxidase activity in the elongation and secondary cell wall deposition zones of elongating leaf blades of the maize inbred line B73 was used as a control and compared to leaves of the dwarf mutant D8-81127, a near-isogenic line of B73 unresponsive to gibberellins, and to leaves of B73 plants to which gibberellic acid (GA 3) had been applied via root uptake. Elongation zone length was increased by treatment with GA 3 through an increase in cell number as well as increased final cell length. The shorter elongation zone of dwarf leaves occurred primarily through reduced final cell length. Although elongation zone length differed among dwarf, control, and GA 3 -treated leaf blades, in all three treatments a transient increase in apoplastic peroxidase activity preceded a reduction in the segmental elongation rate in leaves. A peroxidase isoenzyme with p I7.0 occurred in the leaf elongation zone during growth deceleration in all three treatments, and its activity decreased as growth displaced tissue into the region of secondary cell wall deposition. Growth cessation for all treatments coincided with the first appearance of peroxidase isozymes with pIs of 5.6 and 5.7. Based on the activity of particular isozymes relative to growth and differentiation, the p I7.0 isoenzyme is most likely to be involved in cessation of cell elongation, while isozymes with pIs 5.6 and 5.7 are likely to be active in lignification. MenosThe relationship between apoplastic peroxidase (EC 1.11.1.7) activity and cessation of growth in maize) Zea mays L.) leaf blades was investigated by altering elongation zone length. Apoplastic peroxidase activity in the elongation and secondary cell wall deposition zones of elongating leaf blades of the maize inbred line B73 was used as a control and compared to leaves of the dwarf mutant D8-81127, a near-isogenic line of B73 unresponsive to gibberellins, and to leaves of B73 plants to which gibberellic acid (GA 3) had been applied via root uptake. Elongation zone length was increased by treatment with GA 3 through an increase in cell number as well as increased final cell length. The shorter elongation zone of dwarf leaves occurred primarily through reduced final cell length. Although elongation zone length differed among dwarf, control, and GA 3 -treated leaf blades, in all three treatments a transient increase in apoplastic peroxidase activity preceded a reduction in the segmental elongation rate in leaves. A peroxidase isoenzyme with p I7.0 occurred in the leaf elongation zone during growth deceleration in all three treatments, and its activity decreased as growth displaced tissue into the region of secondary cell wall deposition. Growth cessation for all treatments coincided with the first appearance of peroxidase isozymes with pIs of 5.6 and 5.7. Based on the activity of particular isozymes relative to growth and differentiation, the p I7.0 isoenzyme is most likely to ... Mostrar Tudo |
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Thesagro: |
Ácido giberelico; Milho; Peroxidase. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02260naa a2200169 a 4500
001 2056344
005 2016-11-14
008 2001 bl uuuu u00u1 u #d
100 1 $aSOUZA, I. R. P. de
245 $aGibberellic acid and dwarfism effects on the growth dynamics of B73 maize (Zea mays L.) leaf blades$ba transient increase in apoplastic peroxidase activity precedes cessation of cell elongation.$h[electronic resource]
260 $c2001
520 $aThe relationship between apoplastic peroxidase (EC 1.11.1.7) activity and cessation of growth in maize) Zea mays L.) leaf blades was investigated by altering elongation zone length. Apoplastic peroxidase activity in the elongation and secondary cell wall deposition zones of elongating leaf blades of the maize inbred line B73 was used as a control and compared to leaves of the dwarf mutant D8-81127, a near-isogenic line of B73 unresponsive to gibberellins, and to leaves of B73 plants to which gibberellic acid (GA 3) had been applied via root uptake. Elongation zone length was increased by treatment with GA 3 through an increase in cell number as well as increased final cell length. The shorter elongation zone of dwarf leaves occurred primarily through reduced final cell length. Although elongation zone length differed among dwarf, control, and GA 3 -treated leaf blades, in all three treatments a transient increase in apoplastic peroxidase activity preceded a reduction in the segmental elongation rate in leaves. A peroxidase isoenzyme with p I7.0 occurred in the leaf elongation zone during growth deceleration in all three treatments, and its activity decreased as growth displaced tissue into the region of secondary cell wall deposition. Growth cessation for all treatments coincided with the first appearance of peroxidase isozymes with pIs of 5.6 and 5.7. Based on the activity of particular isozymes relative to growth and differentiation, the p I7.0 isoenzyme is most likely to be involved in cessation of cell elongation, while isozymes with pIs 5.6 and 5.7 are likely to be active in lignification.
650 $aÁcido giberelico
650 $aMilho
650 $aPeroxidase
700 1 $aMACADAM, J. W.
773 $tJournal of Experimental Botany, London$gv. 52, n. 361, p. 1673-1682, Aug. 2001.
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Embrapa Milho e Sorgo (CNPMS) |
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| 7. |  | RAMALHO FILHO, A.; PEREIRA, L. C. Avaliação da aptidão agrícola das terras do Brasil: potencial de terras e análise crítica dos principais métodos de avaliação. In: CONGRESSO LATINO AMERICANO DE CIÊNCIA DO SOLO, 13.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 1.; SIMPÓSIO BRASILEIRO SOBRE MICROBIOLOGIA DO SOLO, 4.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 6.; REUNIÃO BRASILEIRA DE MANEJO E CONSERVAÇÃO DO SOLO E DA ÁGUA, 11., 1996, Águas de Lindóia. Solo suelo 96. Campinas: Sociedade Brasileira de Ciência do Solo, 1996. 1 CD-ROM.| Biblioteca(s): Embrapa Solos. |
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| 15. | | RAMALHO FILHO, A.; PEREIRA, L. C.; OLIVEIRA, R. P. de. Sustainable land management in Brazil: potentialities and user needs. In: CONFERENCE ON GEO INFORMATION FOR SUSTAINABLE LAND MANAGEMENT, 1997, Enschede, The Netherlands. Geo-information for sustainable land management: General information, list of participants, programme, abstracts. Enschede: ITC/ISSS, 1997. Ref.5.2.| Biblioteca(s): Embrapa Solos. |
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| 20. | | RAMALHO FILHO, A.; MOTTA, P. E. F. da; NAIME, U. J.; BACA, J. F. M. Procedimento metodológico da avaliação da aptidão agrícola das terras para a cultura da palma de óleo nas áreas desmatadas da Amazônia Legal. In: RAMALHO FILHO, A.; MOTTA, P. E. F. da; FREITAS, P. L. de; TEIXEIRA, W. G. (ed.). Zoneamento agroecológico, produção e manejo para a cultura da palma de óleo na Amazônia. Rio de Janeiro: Embrapa Solos, 2010. pt. 1, cap. 2, p. 23-45.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Solos. |
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| Registros recuperados : 70 | |
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