Table 1

Pattern and extent of transgenerational, non-additive gene expression in each of the synthetic allohexaploid lines

Synthetic line and

generation

Allo-AT5

Allo-AT9


S4

S5

Aver.

S4

S5

Aver.


Total no. and (%a) of

nonadditively expressed genes

828

(2.8)

1,642

(5.5)

1,235

(4.2)

1,121

(3.8)

930

(3.1)

1,026

(3.5)


No. and (%b) of up-regulated genes

485

(58.6)

826

(50.3)

656

(53.1)

545

(48.6)

398

(42.8)

472

(46.0)


No. and (%b) of down-regulated genes

343

(41.4)

816

(49.7)

580

(46.9)

576

(51.4)

532

(57.2)

554

(54.0)


No. and (%b) of the total as well as up- and down-regulated non-additively expressed genes that matched the genes showing differential expression between parental species

T-483

(58.3)

Up-

237

(28.6)

Down:

246

(29.7)

T-1055

(64.3)

Up-

426

(25.9)

Down:

629

(38.3)

T-769

(62.3)

Up-

332

(26.8)

Down:

438

(35.4)

T-741

(66.1)

Up-

316

(28.2)

Down:

425

(37.9)

T-613

(65.9)

Up-

203

(21.8)

Down:

410

(44.1)

T-677

(66.0)

Up-

260

(25.3)

Down:

418

(40.7)


No. and (%b) of high-diploid

Parental dominance genes

31

(3.7)

41

(2.5)

36

(2.9)

97

(8.7)

79

(8.5)

88

(8.6)


No. and (%b) of high-tetraploid

Parental dominance genes

178

(21.5)

342

(20.8)

260

(21.1)

112

(10.0)

64

(6.9)

88

(8.6)


No. and (%b) of Low-diploid

Parental dominance genes

64

(7.7)

62

(3.8)

63

(5.1)

110

(9.8)

91

(9.8)

101

(9.8)


No. and (%b) of low-tetraploid

parental dominance genes

78

(9.4)

190

(11.6)

134

(10.9)

129

(11.5)

115

(12.4)

122

(11.9)


No. and (%b) of over-dominance

genes

44

(5.3)

94

(5.7)

69

(5.6)

108

(9.6)

65

(7.0)

87

(8.4)


No. and (%b) of under-

Dominance genes

14

(1.7)

31

(1.9)

23

(1.8)

73

(6.5)

35

(3.8)

54

(5.3)


aof all expressed genes.

bof non-additively expressed genes.

The up- or down-regulated numbers of the nonadditively expressed genes.

The nonadditively expressed genes can be divided into six categories based on their expression: F represented the synthetic allohexaploid lines; P, paternal lines; and M, maternal lines. High-paternal dominance, F = P, F > M, P > M; high-maternal dominance, F = M, F > P, M > P; low-paternal dominance, F = P, F < M, P < M; low-maternal dominance, F = M, F < P, M < P; over-dominance, F > P and F > M; under-dominance, F < P and F < M.

Qi et al. BMC Biology 2012 10:3   doi:10.1186/1741-7007-10-3

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