Kohlrabi (IMAGE)
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Kohlrabi, a member of the Brassica genus, is one of 17 vegetables tested that contain glucosinolates, a family of anti-thyroid plants toxins. Subjects with the sensitive form of the bitter receptor TAS2R38 tended to find glucosinolate-producing vegetables more bitter than those with the insensitive form of the gene. The two subject groups did not differ in their perceptions of other bitter vegetables. In the study, subjects tasted the ball at the bottom of the kohlrabi plant, which is actually a stem not a root. For more information see correspondence by Sandell et al. in the Sept. 19 issue of Current Biology.
Credit
Rick Davis
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