Cladogram of plants whose RLK superfamily has been characterized. The RLK superfamily size ranges from 329 (moss) to 1192 (poplar) members. The RLK superfamily expanded after divergence between the Bryophyta and Angiosperm lineages and independently expanded in the plants of the Angiosperm lineage. Dramatic expansions were observed in rice and poplar.
Sakamoto et al. BMC Plant Biology 2012 12:229 doi:10.1186/1471-2229-12-229