The amino acid sequences of all Arabidopsis ABCB (MDR) proteins and those of Vitis vinifera were aligned using the MUSCLE program and subjected to phylogenetic analysis by the distance with neighborjoining method using MEGA5 programme. Accession numbers for Arabidopsis sequences are AtABCB1 (NP_181228.1), AtABCB2 (NP_194326.2), AtABCB3 (NP_192091.1), AtABCB4 (NP_182223.1), AtABCB5 (NP_192092.1), AtABCB6 (NP_181480.1), AtABCB7 (NP_199466.1), AtABCB8 (NP_683599.1), AtABCB9 (NP_193539.6), AtABCB10 (NP_172538.1), AtABCB11 (NP_171753.1), AtABCB12 (NP_171754.1), AtABCB13 (NP_174115.1), AtABCB14 (NP_174122.1), AtABCB15 (NP_189475.1), AtABCB16 (NP_189477.4), AtABCB17 (NP_189479.1), AtABCB18 (NP_189480.1), AtABCB19 (NP_189528.1), AtABCB20 (NP_191092.1) and AtABCB21 (NP_191774.1). AtSKD1 (AEC08019.1) and VvSKD1 (XP_002266534.1) were used as outgroups.