Interaction Between Atmospheric CO2 and Glucosinolates in Broccoli
2007
Schonhof, I. | Kläring, H.-P. | Krumbein, A. | Schreiner, M.
Total and individual glucosinolate contents of broccoli cv Marathon were assessed at ambient CO₂ (430–480 ppm) and elevated atmospheric CO₂ (685–820 ppm) to determine the ecological relationship between changing atmospheric CO₂ concentrations and phytochemicals. Elevated atmospheric CO₂ concentration had a differing effect on individual glucosinolates and glucosinolate groups. Total glucosinolate content increased at elevated atmospheric CO₂ concentration as a result of a strong increase in both methylsulfinylalkyl glucosinolates glucoraphanin and glucoiberin. In contrast, indole glucosinolates simultaneously decreased, predominantly because of a reduction of glucobrassicin and 4-methoxy-glucobrassicin contents. We conclude that changes in N content and N/S ratios as well as alterations in photochemical processes at elevated atmospheric CO₂ concentration can influence total and individual glucosinolates contents of Brassicaceae, as demonstrated in the greenhouse, for broccoli.
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