Physiological changes during postharvest senescence of broccoli

Pesquisa Agropecuária Brasileira

Fernando Luiz Finger²  Laurício Endres¹  Paulo Roberto Mosquim¹  Mário Puiatti¹ 

[1] ,UFV Dep.deFitotecnia Viçosa MG

关键词: chlorophyll;    peroxidase;    respiration;    starch;    soluble sugars;    clorofila;    peroxidase;    respiração;    amido;    açúcares solúveis;   

DOI  :  10.1590/S0100-204X1999000900006

来源: SciELO

【 摘 要 】

The objective of this work was to determine the early physiological changes throughout shelf life of fresh broccoli (Brassica oleracea L. var. italica) cv. Piracicaba Precoce at 25ºC 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.

【 授权许可】

CC BY   
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