Table 1 Linear regressions between the number of monocot species with a syntenic anchor to the Nelumbo gene (x) and different gene-related traits (y) for all Nelumbo genes

Methylation level (−1 kb)

y = 0.0581 − 0.00111x

−0.22

0.0484

2.20 × 10⁻¹⁶

Methylation level (+1 kb)

y = 0.0517 − 0.000983x

−0.21

0.0441

2.20 × 10⁻¹⁶

Tissue specificity (τ index)

y = 0.571 − 0.00426x

−0.21

0.0441

2.20 × 10⁻¹⁶

No. of exons

y = 4.03 + 0.0657x

0.18

0.0324

2.20 × 10⁻¹⁶

CDS length

y = 1020 + 12.1x

0.17

0.0289

2.20 × 10⁻¹⁶

Average expression level (FPKM)

y = 2.07 + 0.0242x

0.15

0.0225

2.20 × 10⁻¹⁶

Methylation level (gene)

y = 0.0547 − 0.000709x

−0.15

0.0225

2.20 × 10⁻¹⁶

Proportion of TEs (+3 kb)

y = 0.392 − 0.00208x

−0.12

0.0144

2.20 × 10⁻¹⁶

Nucleotide diversity (π)

y = 0.000677 − (1.01 × 10⁻⁵)x

−0.11

0.0121

2.20 × 10⁻¹⁶

Proportion of TEs (−3 kb)

y = 0.423 − 0.0017x

−0.094

0.008836

2.20 × 10⁻¹⁶

Gene length

y = 7460 + 83.6x

0.069

0.004761

2.20 × 10⁻¹⁶

PPI

y = 0.871 + 0.0108x

0.034

0.001156

1.40 × 10⁻⁸

Proportion of TEs (gene)

y = 0.187 − 0.000149x

0.0081

0.00006561

0.16