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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
28/01/1998 |
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Data da última atualização: |
13/07/2018 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
LOPES, M. A.; LARKINS, B. A. |
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Afiliação: |
EMBRAPA-CNPMS. |
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Título: |
Genetic regulation of modified protein composition in hard-endosperm opaque-2 maize (QPM). |
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Ano de publicação: |
1990 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON SORGHUM NUTRITIONAL QUALITY, 1990, West Lafayette. Proceedings. West Lafayette: Purdue University, 1990. p. 142-154. |
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Idioma: |
Inglês |
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Conteúdo: |
Opaque-2 (o2) is a mutation of one of the regulatory loci that control storage protein gene expression in maize endosperm. It results in a drastic reduction in the prolamine content of the seed, which impacts on the nutritional quality. The soft endosperm associated with this mutation is probably a consequence of the low amounts of these proteins, although the relationship between the reduction in prolamine content and this phenotype is not weel understood. Qaulity Protein Maize (QPM) seeds are opaque-2 genotypes with a high frequency of "modifier genes" that confer a normal, vitreous phenotype to the endosperm, while maintaining high levels of lysine and tryptophan in the protein. As in the soft endosperm opaque-2 mutant, the improved nutritional quality of QPM genotypes is due to a higher percentage of the non-zein fraction which is nutritionally more balanced than the zein proteins. However, the storage protein of QPM contains a pronounced increase in the amount of the Mr 27,000 gamma-zein as compared to normal, unmodified, opaque-2 genotypes. The synthesis of this protein is not regulated by the opaque-2 (o2) loci. Our studies with normal, soft endosperm opaque-2, and opaque-2 QPM genotypes, individually and in combination, suggest that there may be a relationships between the high synthesis of this zein protein (Mr 27,000) and modification of kernel structure in mutant genotypes. |
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Palavras-Chave: |
Biotecnology; Milho opaco; Opaque 2; Protein; QPM; Quality. |
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Thesagro: |
Biologia Molecular; Biotecnologia; Proteína; Qualidade. |
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Thesaurus Nal: |
molecular biology. |
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Categoria do assunto: |
S Ciências Biológicas |
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Marc: |
LEADER 02208nam a2200253 a 4500
001 1478770
005 2018-07-13
008 1990 bl uuuu u00u1 u #d
100 1 $aLOPES, M. A.
245 $aGenetic regulation of modified protein composition in hard-endosperm opaque-2 maize (QPM).$h[electronic resource]
260 $aIn: INTERNATIONAL CONFERENCE ON SORGHUM NUTRITIONAL QUALITY, 1990, West Lafayette. Proceedings. West Lafayette: Purdue University, 1990. p. 142-154.$c1990
520 $aOpaque-2 (o2) is a mutation of one of the regulatory loci that control storage protein gene expression in maize endosperm. It results in a drastic reduction in the prolamine content of the seed, which impacts on the nutritional quality. The soft endosperm associated with this mutation is probably a consequence of the low amounts of these proteins, although the relationship between the reduction in prolamine content and this phenotype is not weel understood. Qaulity Protein Maize (QPM) seeds are opaque-2 genotypes with a high frequency of "modifier genes" that confer a normal, vitreous phenotype to the endosperm, while maintaining high levels of lysine and tryptophan in the protein. As in the soft endosperm opaque-2 mutant, the improved nutritional quality of QPM genotypes is due to a higher percentage of the non-zein fraction which is nutritionally more balanced than the zein proteins. However, the storage protein of QPM contains a pronounced increase in the amount of the Mr 27,000 gamma-zein as compared to normal, unmodified, opaque-2 genotypes. The synthesis of this protein is not regulated by the opaque-2 (o2) loci. Our studies with normal, soft endosperm opaque-2, and opaque-2 QPM genotypes, individually and in combination, suggest that there may be a relationships between the high synthesis of this zein protein (Mr 27,000) and modification of kernel structure in mutant genotypes.
650 $amolecular biology
650 $aBiologia Molecular
650 $aBiotecnologia
650 $aProteína
650 $aQualidade
653 $aBiotecnology
653 $aMilho opaco
653 $aOpaque 2
653 $aProtein
653 $aQPM
653 $aQuality
700 1 $aLARKINS, B. A.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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