Figure 1.

Dendrograms of the Arabidopsis thaliana, Glycine max and Oryza sativa key genes responsive to drought, based on the amino acid sequences. The multiple alignment was made using ClustalW2 and the dendrograms were built using MEGA4.0 software, with the Neighbor-Joining and pair-wise deletion options as a consensus of 1,000 bootstrap replicates. O. sativa was used as outgroup. The solid brown arrows indicate the Arabidopsis reference key genes and the dotted purple arrows indicate the respective soybean homologs selected for qPCR validation of expression. A) Dendrogram of the RD20A family of A. thaliana, G. max and O. sativa; B) Dendrogram of the RD22 family of A. thaliana, G. max and O. sativa; C) Dendrogram of the RD29B family of A. thaliana, G. max and O. sativa; D) Dendrogram of the ERD1 family of A. thaliana, G. max and O. sativa.