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Table 2 Comparisons of the PCA results from the differentially expressed metabolites data of 15 amino acids (AAs), 31 organic acids (OAs) and 38 sugars and data of 918 related differentially expressed genes (DEGs) detected in LTH and IR29 under the chilling stress and non-stress control at the seedling stage

From: Temporal profiling of primary metabolites under chilling stress and its association with seedling chilling tolerance of rice (Oryza sativa L.)

Principal components (PC)

Metabolites or related DEGs1

Transcriptomic data

Metabolomic data

N

%

N

%

PC1 (Stress treatments)

R2 (%)

 

39.4

 

20.9

AA+

140

37.5

1

6.7

AA-

181

48.5

8

53.3

(AA+OA+sugar)+

94

32.2

  

(AA+OA+sugar-

143

49.0

  

OA+

39

33.3

25

80.6

OA-

53

45.3

0

0

(OA+sugar)+

7

13.7

  

(OA+sugar)-

28

54.9

  

Sugar+

30

35.3

29

76.3

Sugar-

33

38.8

0

0

PC3/PC2 (Genotypic differences)

R2 (%)

 

13.5

 

13.8

AA+

118

31.6

8

53.3

AA-

60

19.2

2

13.3

(AA+OA+sugar)+

72

24.7

  

(AA+OA+sugar-

66

22.6

  

OA+

36

30.8

7

22.6

OA-

29

24.8

17

54.8

(OA+sugar)+

24

47.1

  

(OA+sugar)-

7

13.7

  

Sugar+

29

34.1

16

42.1

Sugar-

15

17.6

12

31.6

PC2/PC3 (Genotypic difference in recovery/treatment timing)

R2 (%)

20.3

 

13.5

 

AA+

108

29.0

13

86.7

AA-

102

27.3

0

0

(AA+OA+sugar)+

81

27.7

  

(AA+OA+sugar-

97

33.2

  

OA+

43

36.8

11

35.5

OA-

35

29.9

5

16.1

(OA+sugar)+

24

47.1

  

(OA+sugar)-

16

31.4

  

Sugar+

29

34.1

18

47.4

 

Sugar-

33

38.8

9

23.7

  1. 1 N is the number of related DEGs or metabolites showing significant positive (+) or negative (-) loading (contributions) to the corresponding principal components (PCs).