Additional file 1: Figure S1. of B-BOX genes: genome-wide identification, evolution and their contribution to pollen growth in pear (Pyrus bretschneideri Rehd.)

Expression profiles of PbBBX genes in pear pollen. P1, P2, P3, and P4 are represents mature dry pollen, hydrated pollen grains, pollen tubes, and stop growing pollen tubes, respectively. Color scale represents log2 transformed RPKM (Reads Per Kilobase per Million mapped reads) values. The gradually change of the color indicates different expression level of PbBBX genes, and the middle expression level was represented by white color. (TIFF 87 kb)