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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Hortaliças. Para informações adicionais entre em contato com cnph.biblioteca@embrapa.br. |
Registro Completo |
Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
21/07/2000 |
Data da última atualização: |
11/06/2024 |
Autoria: |
CANTLIFFE, D. J.; NASCIMENTO, W. M.; SUNG, Y.; HUBER, D. J. |
Afiliação: |
D. J. CATLIFFE, UNIVERSITY OF FLORIDA; WARLEY MARCOS NASCIMENTO, CNPH. |
Título: |
Lettuce endosperm weakening: a role for endo-B-mannanase in seed germination at high temperature. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
In: BLACK, M.; BRADFORD, K.J.; VAZQUEZ-RAMOS, J., (Ed.). Seed biology: advances and applications. Wallingford: CAB, 2000. |
Páginas: |
p. 277-285. |
ISBN: |
0-85199-404-0 |
Idioma: |
Inglês |
Conteúdo: |
Under high temperatures, seed germination of most lettuce genotypes can be erratic or completely inhibited. Weakening of the endosperm layer is a prerequisite to radicle protrusion at high temperatures. Enzyme-mediated degradation of endosperm cell walls may be a crucial factor for lettuce germination at high temperatures. The galactomannan polysaccharides in lettuce endosperm cell wall are mobilized by endo-b-mannanase. The involvement of endo-b-mannanase during germination of lettuce seeds at high temperature (35°C) was investigated by gel-diffusion assay. Genotype, seed maturation temperature, and seed priming enhanced lettuce seed germination at high temperature. Less force to penetrate the endosperm was required by seeds of thermotolerant genotypes or primed seeds, and structural alterations of endosperm in the micropylar area were also observed before radicle protrusion. Higher endo-b-mannanase activity in lettuce endosperm before radicle protrusion was verified in these situations. Moreover, at high temperature, thermotolerant genotypes produced more ethylene, more endo-b-mannanase, and germinated better than thermosensitive genotypes. An inhibitor of ethylene action, silver thiosulphate, inhibited both mannanase activity and germination. A precursor of ethylene, ACC, induced endo-b-mannanase activity and germination of thermosensitive ‘Dark Green Boston’ at 35°C. These results suggest that increased endo-b-mannanase activity might contribute to lettuce endosperm weakening, especially at high temperatures. MenosUnder high temperatures, seed germination of most lettuce genotypes can be erratic or completely inhibited. Weakening of the endosperm layer is a prerequisite to radicle protrusion at high temperatures. Enzyme-mediated degradation of endosperm cell walls may be a crucial factor for lettuce germination at high temperatures. The galactomannan polysaccharides in lettuce endosperm cell wall are mobilized by endo-b-mannanase. The involvement of endo-b-mannanase during germination of lettuce seeds at high temperature (35°C) was investigated by gel-diffusion assay. Genotype, seed maturation temperature, and seed priming enhanced lettuce seed germination at high temperature. Less force to penetrate the endosperm was required by seeds of thermotolerant genotypes or primed seeds, and structural alterations of endosperm in the micropylar area were also observed before radicle protrusion. Higher endo-b-mannanase activity in lettuce endosperm before radicle protrusion was verified in these situations. Moreover, at high temperature, thermotolerant genotypes produced more ethylene, more endo-b-mannanase, and germinated better than thermosensitive genotypes. An inhibitor of ethylene action, silver thiosulphate, inhibited both mannanase activity and germination. A precursor of ethylene, ACC, induced endo-b-mannanase activity and germination of thermosensitive ‘Dark Green Boston’ at 35°C. These results suggest that increased endo-b-mannanase activity might contribute to lettuce endosperm weak... Mostrar Tudo |
Palavras-Chave: |
Endosperms; High temperature. |
Thesagro: |
Alface; Atividade Enzimática; Dormência; Endosperma; Germinação; Lactuca Sativa; Semente; Temperatura. |
Thesaurus Nal: |
dormancy; enzyme activity; germination; lettuce; seeds. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
Marc: |
LEADER 02576naa a2200361 a 4500 001 1767626 005 2024-06-11 008 2000 bl uuuu u00u1 u #d 020 $a0-85199-404-0 100 1 $aCANTLIFFE, D. J. 245 $aLettuce endosperm weakening$ba role for endo-B-mannanase in seed germination at high temperature.$h[electronic resource] 260 $c2000 300 $ap. 277-285. 520 $aUnder high temperatures, seed germination of most lettuce genotypes can be erratic or completely inhibited. Weakening of the endosperm layer is a prerequisite to radicle protrusion at high temperatures. Enzyme-mediated degradation of endosperm cell walls may be a crucial factor for lettuce germination at high temperatures. The galactomannan polysaccharides in lettuce endosperm cell wall are mobilized by endo-b-mannanase. The involvement of endo-b-mannanase during germination of lettuce seeds at high temperature (35°C) was investigated by gel-diffusion assay. Genotype, seed maturation temperature, and seed priming enhanced lettuce seed germination at high temperature. Less force to penetrate the endosperm was required by seeds of thermotolerant genotypes or primed seeds, and structural alterations of endosperm in the micropylar area were also observed before radicle protrusion. Higher endo-b-mannanase activity in lettuce endosperm before radicle protrusion was verified in these situations. Moreover, at high temperature, thermotolerant genotypes produced more ethylene, more endo-b-mannanase, and germinated better than thermosensitive genotypes. An inhibitor of ethylene action, silver thiosulphate, inhibited both mannanase activity and germination. A precursor of ethylene, ACC, induced endo-b-mannanase activity and germination of thermosensitive ‘Dark Green Boston’ at 35°C. These results suggest that increased endo-b-mannanase activity might contribute to lettuce endosperm weakening, especially at high temperatures. 650 $adormancy 650 $aenzyme activity 650 $agermination 650 $alettuce 650 $aseeds 650 $aAlface 650 $aAtividade Enzimática 650 $aDormência 650 $aEndosperma 650 $aGerminação 650 $aLactuca Sativa 650 $aSemente 650 $aTemperatura 653 $aEndosperms 653 $aHigh temperature 700 1 $aNASCIMENTO, W. M. 700 1 $aSUNG, Y. 700 1 $aHUBER, D. J. 773 $tIn: BLACK, M.; BRADFORD, K.J.; VAZQUEZ-RAMOS, J., (Ed.). Seed biology: advances and applications. Wallingford: CAB, 2000.
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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Tabuleiros Costeiros. Para informações adicionais entre em contato com cpatc.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Tabuleiros Costeiros. |
Data corrente: |
23/01/2018 |
Data da última atualização: |
23/01/2018 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
DOMPIERI, M. H. G.; SILVA, M. A. S. da; RUSSO, S. L. |
Afiliação: |
MARCIA HELENA GALINA DOMPIERI, CPATC; MARCOS AURELIO SANTOS DA SILVA, CPATC; SUZANA LEITAO RUSSO, UFS. |
Título: |
Modelagem Box-Jenkins sazonal na análise da produção de fertilizantes intermediários no Brasil. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
In: CONGRESSO DE ESTATÍSTICA, 5.; SEMANA ACADÊMICA DE ESTATÍSTICA, 8., 2017, São Cristóvão. Anais ... São Cristóvão, DF: Universidade Federal de Sergipe, 2017. |
Idioma: |
Português |
Thesagro: |
Estatística; Fertilizante. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00602nam a2200145 a 4500 001 2086095 005 2018-01-23 008 2017 bl uuuu u00u1 u #d 100 1 $aDOMPIERI, M. H. G. 245 $aModelagem Box-Jenkins sazonal na análise da produção de fertilizantes intermediários no Brasil.$h[electronic resource] 260 $aIn: CONGRESSO DE ESTATÍSTICA, 5.; SEMANA ACADÊMICA DE ESTATÍSTICA, 8., 2017, São Cristóvão. Anais ... São Cristóvão, DF: Universidade Federal de Sergipe$c2017 650 $aEstatística 650 $aFertilizante 700 1 $aSILVA, M. A. S. da 700 1 $aRUSSO, S. L.
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