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Registro Completo |
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
17/12/2002 |
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Data da última atualização: |
17/12/2002 |
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Autoria: |
FINGER, F.L.; ENDRES, L.; MOSQUIM, P.R.; PUIATTI, M. |
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Título: |
Physiological changes during postharvest senescence of broccoli. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.34, n.9, p.1565-1569, set. 1999. |
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Idioma: |
Inglês |
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Conteúdo: |
The objective of this work was to determine the early physiological changes throughout shelf life fresh broccoli (Brassica oleracea L. var. italica) cv. Piracicaba Precoce at 25 graus C. and relative humidity of 96% in the dark until complete senescence. Head inflorescences showed lack of turgidity and commercial value when weight loss reached up to 5%, coinciding with 48 hour after harvest. Chlorophyll content was stable until 24 hours after harvesting; afterwards, an intense degradation phase took place. At 72 hours, total head yellowing was observed when chlorophyll content dropped to 30% of its initial content. Peroxidase activity increased by 1.4 fold during the first six hours, dropping to its lowest level approximately 24 hours after harvesting. However, from this time on, an increment of activity was observed until 72 hours. At 24 hours after harvesting, respiration was reduced by 50%. At later stages of senescence, respiration of florets was stable, but in a lower level than that determined at harvest.Sharp reduction of starch and reducing sugars was observed within 24 hours after harvesting, followed by continuous period of decline in starch and non-reducing sugars. |
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Palavras-Chave: |
Acucares soluveis; Amido; Chlorophyll; Clorofila; Peroxidase; Respiracao; Respiration; Soluble sugars; Starch. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01890naa a2200265 a 4500
001 1022837
005 2002-12-17
008 1999 bl uuuu u00u1 u #d
100 1 $aFINGER, F.L.
245 $aPhysiological changes during postharvest senescence of broccoli.
260 $c1999
520 $aThe objective of this work was to determine the early physiological changes throughout shelf life fresh broccoli (Brassica oleracea L. var. italica) cv. Piracicaba Precoce at 25 graus C. and relative humidity of 96% in the dark until complete senescence. Head inflorescences showed lack of turgidity and commercial value when weight loss reached up to 5%, coinciding with 48 hour after harvest. Chlorophyll content was stable until 24 hours after harvesting; afterwards, an intense degradation phase took place. At 72 hours, total head yellowing was observed when chlorophyll content dropped to 30% of its initial content. Peroxidase activity increased by 1.4 fold during the first six hours, dropping to its lowest level approximately 24 hours after harvesting. However, from this time on, an increment of activity was observed until 72 hours. At 24 hours after harvesting, respiration was reduced by 50%. At later stages of senescence, respiration of florets was stable, but in a lower level than that determined at harvest.Sharp reduction of starch and reducing sugars was observed within 24 hours after harvesting, followed by continuous period of decline in starch and non-reducing sugars.
653 $aAcucares soluveis
653 $aAmido
653 $aChlorophyll
653 $aClorofila
653 $aPeroxidase
653 $aRespiracao
653 $aRespiration
653 $aSoluble sugars
653 $aStarch
700 1 $aENDRES, L.
700 1 $aMOSQUIM, P.R.
700 1 $aPUIATTI, M.
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.34, n.9, p.1565-1569, set. 1999.
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