Table 1 Differential metabolites in leaf and head lettuce cultivars

LC_95

Caffeoylquinic acid hexose isomer 1

2.50

3.23

1.53E−02

8.12E−17

1.39E−14

LC_100

Caffeoylquinic acid hexose isomer 2

2.33

2.48

1.95E−02

7.24E−15

6.19E−13

LC_141

Quercetin 3-glucoside -6″-acetate (isomer 1)

2.21

3.09

8.37E−03

5.61E−14

3.20E−12

LC_144

Quercetin 3-glucoside -6″-acetate (isomer 2)

2.20

5.09

1.34E−02

1.15E−13

4.91E−12

LC_149

Quercetin diacetyl-hexoside

2.05

14.08

7.22E−03

9.79E−12

3.35E−10

LC_113

Quercetin 3-O-(6″-O-malonyl)-glucoside 7-O-glucoside

2.04

4.06

1.01E−02

2.20E−11

6.27E−10

LC_122

Luteolin di-glucoside

1.93

3.07

7.95E−03

1.51E−10

3.69E−09

LC_102

Dihydrocaffeic acid hexose isomer 2

1.90

2.48

1.03E−02

6.71E−10

1.43E−08

LC_90

Dihydroxybenzoic acid

1.87

2.39

1.32E−02

1.17E−09

2.22E−08

LC_112

Quercetin 3-O-(6″-O-malonyl)-glucoside 7-O-glucuronide

1.85

2.54

7.12E−03

1.87E−09

3.19E−08

LC_106

Dihydrocaffeic acid hexose isomer 3

1.82

2.36

5.11E−03

7.33E−09

1.14E−07

LC_120

Quercetin hexoside glucuronide isomer 3

1.77

2.66

6.91E−03

2.17E−08

2.85E−07

LC_135

Luteolin 7-glucuronide

1.63

2.51

4.10E−03

8.65E−08

7.79E−07

LC_103

Geniposide

1.55

9.17

1.10E−02

1.22E−06

9.92E−06

LC_97

Caffeoyl-hexose isomer 1

1.35

2.30

5.38E−03

6.22E−05

2.96E−04

LC_117

Luteolin glucuronide-hexoside

1.32

3.13

1.70E−02

3.02E−05

1.52E−04