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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
29/03/1994 |
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Data da última atualização: |
29/03/1994 |
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Autoria: |
BAR-PELED, M.; FLUHR, R.; GRESSEL, J. |
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Afiliação: |
Department of Plant Genetics, The Weizamann Institute of Science, Rehovot 76100, Israel. |
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Título: |
Juvenile-Specific localization and accumulation of a rhamnosyltransfrase and its bitter flavonoid in foliage, flowers, and yong Citrus fruit |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Plant Physiology, v.103, n.4, p.1377-1384, dez. 1993 |
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ISSN: |
0032-0889 |
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Idioma: |
Inglês |
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Conteúdo: |
Rhamnosyltransferase catalyzes the production of disaccharide-flavonoids that accumulate to 75% of dry weight. Vast energy is expended in short time span to produce these flavonoids. The highoest rhamnosyltransferase activities and immunodetected concentrations were observed in early development of Citrus grandis (pummelo), coinciding with up to 13% of fresh weight as naringin. The concentration of naringin in leaves, petals, receptacles, filaments, albedo, and flavedo drops drastically development and corrdlated directly with a decrease in the activity and amounts of 1-2-rhamnosyltransferase. Anthers had minute rhamnosyltrans ferase activities and low concentrations of naringin. Conversely,high 1-2-rhamnosyltransferase activity and naringin concentra tions appeared in both young and mature ovaries, as well as in young fruits. The total amounts of naringin in mature leaves decreased without detectable in vitro degradation of naringin in leaves. There was still a net accumulation of naringin in the albedo and flovedo of older fruit even though these tissues had only traces of 1-2-rhamnosyltransferase. Traces of enzyme synthesis in fruits or import of the product from leaves, may explain the net accumulation of naring in growing fruits. Unlike the late-expressed genes for glycosyltransferases in anthocyanin biosynthesis, the rhamnosyltransferases from Citrus are active only in juvenile stages of development. |
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Palavras-Chave: |
Biosintese; Fisilogia. |
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Thesagro: |
Metabolismo. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02006naa a2200193 a 4500
001 1633056
005 1994-03-29
008 1993 bl uuuu u00u1 u #d
022 $a0032-0889
100 1 $aBAR-PELED, M.
245 $aJuvenile-Specific localization and accumulation of a rhamnosyltransfrase and its bitter flavonoid in foliage, flowers, and yong Citrus fruit
260 $c1993
520 $aRhamnosyltransferase catalyzes the production of disaccharide-flavonoids that accumulate to 75% of dry weight. Vast energy is expended in short time span to produce these flavonoids. The highoest rhamnosyltransferase activities and immunodetected concentrations were observed in early development of Citrus grandis (pummelo), coinciding with up to 13% of fresh weight as naringin. The concentration of naringin in leaves, petals, receptacles, filaments, albedo, and flavedo drops drastically development and corrdlated directly with a decrease in the activity and amounts of 1-2-rhamnosyltransferase. Anthers had minute rhamnosyltrans ferase activities and low concentrations of naringin. Conversely,high 1-2-rhamnosyltransferase activity and naringin concentra tions appeared in both young and mature ovaries, as well as in young fruits. The total amounts of naringin in mature leaves decreased without detectable in vitro degradation of naringin in leaves. There was still a net accumulation of naringin in the albedo and flovedo of older fruit even though these tissues had only traces of 1-2-rhamnosyltransferase. Traces of enzyme synthesis in fruits or import of the product from leaves, may explain the net accumulation of naring in growing fruits. Unlike the late-expressed genes for glycosyltransferases in anthocyanin biosynthesis, the rhamnosyltransferases from Citrus are active only in juvenile stages of development.
650 $aMetabolismo
653 $aBiosintese
653 $aFisilogia
700 1 $aFLUHR, R.
700 1 $aGRESSEL, J.
773 $tPlant Physiology$gv.103, n.4, p.1377-1384, dez. 1993
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Embrapa Mandioca e Fruticultura (CNPMF) |
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| 1. |  | ZISKA, L. H.; GEALY, D. R.; BURGOS, N.; CAICEDO, A. L.; GRESSEL, J.; LAWTON-RAUH, A. L.; AVILA, L. A.; THEISEN, G.; NORSWORTHY, J.; FERRERO, A.; VIDOTTO, F.; JOHNSON, D. E.; FERREIRA, F. G.; MARCHESAN, E.; MENEZES, V.; COHN, M. A.; LINSCOMBE, S.; CARMONA, L.; TANG, R.; MEROTTO, A. Weedy (Red) Rice: an emerging constraint to global rice production. Advances in Agronomy, v. 129, p. 181-228, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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