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  • Title: Influence of day length and temperature on the content of health-related compounds in broccoli (Brassica oleracea L. var. italica).
    Author: Steindal AL, Mølmann J, Bengtsson GB, Johansen TJ.
    Journal: J Agric Food Chem; 2013 Nov 13; 61(45):10779-86. PubMed ID: 24168154.
    Abstract:
    Vegetables grown at different latitudes are exposed to various temperatures and day lengths, which can affect the content of health- and sensory-related compounds in broccoli florets. A 2 × 2 factorial experiment was conducted under controlled growth conditions, with contrasting temperatures (15/9 and 21/15 °C) and day lengths (12 and 24 h), to investigate the effect on glucosinolates, vitamin C, flavonols, and soluble sugars. Aliphatic glucosinolates, quercetin, and kaempferol were at their highest levels at high temperatures combined with a 12 h day. Levels of total glucosinolates, d-glucose, and d-fructose were elevated by high temperatures. Conversely, the content of vitamin C was highest with a 12 h day length combined with 15/9 °C. Our results indicate that temperature and day length influence the contents of health-related compounds in broccoli florets in a complex way, suggesting no general superiority of any of the contrasting growth conditions.
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