Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 61, Issue 45, Pages 10779-10786Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf403466r
Keywords
Brassica oleracea L. var. italica; broccoli; glucosinolates; flavonols; soluble sugars; vitamin C; photoperiod; temperature; day length
Funding
- Research Council of Norway [185017/110]
- Norwegian Foundation for Research Levy on Agricultural Products
- BAMA Gruppen AS, Gartnerhallen SA
- COOP Norge AS
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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 X 2 factorial experiment was conducted under controlled growth conditions, with contrasting temperatures (15/9 and 21/15 degrees 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 degrees 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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