Comparing the two studies, it seems that
Brassica oleracea and B. napus seem more sensitive to
waterlogging than B. rapa. B. napus cv Chikuzen is able to
produce roots on the hypocotyl (Voesenek et al., 1999), as is
Caisin, but in the case of Chikuzen this does not seem to be
associated with increased tolerance to waterlogging, at least in
plants up to 25 days old.