We characterize all plane bipartite graphs whose resonance graphs are daisy
cubes and therefore generalize related results on resonance graphs of benzenoid
graphs, catacondensed even ring systems, as well as 2-connected outerplane
bipartite graphs. Firstly, we prove that if G is a plane elementary bipartite
graph other than K2, then the resonance graph R(G) is a daisy cube if and
only if the Fries number of G equals the number of finite faces of G, which
in turn is equivalent to G being homeomorphically peripheral color
alternating. Next, we extend the above characterization from plane elementary
bipartite graphs to all plane bipartite graphs and show that the resonance
graph of a plane bipartite graph G is a daisy cube if and only if G is
weakly elementary bipartite and every elementary component of G other than
K2 is homeomorphically peripheral color alternating. Along the way, we prove
that a Cartesian product graph is a daisy cube if and only if all of its
nontrivial factors are daisy cubes