Hanninen et al. 1999 [929
] show that there is potential IgE cross-reactivity between prohevein (Hev b 6.01) or hevein (Hev b 6.02) hevein from natural rubber latex and plants such as turnip. Five fragments of the sequence of the chitin binding protein, Bra r 2, showed 70% identity with Hev b 6.
Hanninen et al. 1999  studied the induction of IgE binding proteins (allergens) cross-reactive with natural rubber latex, NRL, in turnip. They found that salicylic acid or ethephon (an ethylene-releasing agent) induced the allergens. The SPT results above on NRL allergic patients are the evidence that this may have clinical significance.
Turnip has also been shown to cause contact allergy (Munoz-Bellido et al. 2003 ).