Distribution of the response patterns to repeated dehydration stress by homologous genes in the two species. A) Overall maize memory genes and their homologs in Arabidopsis are shown in the larger frames. The numbers of Arabidopsis homologous genes distributed according to the patterns of their responses to repeated dehydration stress are in the smaller frames below. Comparable numbers of the homologs respond to dehydration stress by providing memory or non-memory responses in Arabidopsis. The largest numbers of homologous genes not belonging in the dehydration response category are indicated. Members of gene families homologous to a maize memory gene account for the higher numbers of genes in Arabidopsis. B) Distribution of the maize homologs in Arabidopsis according to the memory response type. The numbers of maize genes of a particular memory category are in larger frames. The numbers of respective homologs according to their responses in Arabidopsis are in smaller frames: memory response genes are in shaded brackets (bottom rows); conserved-memory responses are shaded in green; non-memory genes and Arabidopsis homologs that do not respond in S1 (indicated by the =/* sign) are in brackets on top. Multiple members with a gene family responding differently to dehydration stress account for the higher numbers of summed up genes in both species.