Table 2 Calculation of substitution rates of homologues SWEET genes between Saccharum spontaneum and Sorghum bicolor

Clade I

SsSWEET1

Sb09g020860

105.1

644.9

0.0451

0.1673

0.2696

SsSWEET2

Sb03g032190

106.2

646.8

0.0613

0.3314

0.1851

SsSWEET3a

Sb09g006950

73.1

643.9

0.096

0.2051

0.4679

SsSWEET3b

Sb03g001520

83.1

648.9

0.0413

0.1782

0.232

Clade II

SsSWEET4d

Sb03g003470

159.7

420.2

0.5298

0.5749

0.9215

N/A

Sb03g003480

N/A

N/A

N/A

N/A

N/A

SsSWEET4a

Sb04g015420

203.5

573.5

0.0086

0.3632

0.0238

SsSWEET4b

Sb04g012910

135.9

614.1

0.0095

0.267

0.0355

SsSWEET4c

Sb04g012920

140.9

372.1

0.0233

0.3578

0.0652

SsSWEET5

Sb09g030270

113.5

654.5

0.0256

0.3868

0.0661

SsSWEET6

Sb03g027260

92.8

528.2

0.02

0.4329

0.0461

Clade III

SsSWEET11a

Sb07g026040

164.6

744.4

0.008

0.1685

0.0475

SsSWEET11b

Sb02g029430

109.1

676.9

0.0291

0.1804

0.161

SsSWEET12

Sb01g035490

159.9

821.1

0.0186

0.1214

0.1535

SsSWEET13a

Sb08g014040

148.2

775.8

0.0177

0.4333

0.0408

SsSWEET13b

Sb08g013840

113.9

810.1

0.0484

0.4496

0.1077

SsSWEET13c

Sb08g013620

108.8

707.2

0.0091

0.3827

0.0237

SsSWEET14

Sb05g018110

142.2

763.8

0.0443

0.4067

0.1089

SsSWEET15

Sb04g021000

161.9

741.1

0.0499

0.2817

0.1771

Clade IV

SsSWEET16a

Sb01g035840

109.8

844.2

0.037

0.2446

0.1512

SsSWEET16b

Sb03g012930

102.9

386.1

0.0377

0.0916

0.4117