Influence of lighting in retail markets on atmospheric composition in vegetable packaging.
Herppich, W.B. and Linke, M.
ISHS Acta Horticulturae 553: 693-694.
2001
บทคัดย่อ
Packed corn salads (Valerianella olitoria [Valerianella locusta]) in different types of packaging (polypropylene trays with either polyethylene stretch film or sealed polyethylene film bags) were purchased from local supermarkets. Halogen lamps were set to a photon fluence rate of approximately 200 micro mol m-2 s-1 above the packaging. Steady state oxygen and carbon dioxide concentrations varied to only a small degree within one type of packaging. Differences were large when different types of packaging were compared. Irrespective of the packaging, illumination induced photosynthetic activity which rapidly, within 1-2 h, reduced the carbon dioxide concentration inside the packaging to a level below ambient. The results indicate that the corn salad plants were well-adapted to low temperatures. Ethylene concentration was relatively high and more or less constant both in packaging illuminated or kept in darkness. Both carbon dioxide exchange and photosynthetic electron transport (ETR) were light saturated at photon fluence rates above 300 micro mol m-2 s-1. In older leaves, increasing the light intensity reduced photosynthesis. Light compensation of carbon dioxide uptake was at a photon fluence rate of 17 micro mol m-2 s-1.