Table 1 GO categorization of differentially expressed poplar genes during water-deficit treatment

Biological Process

Metabolic process

27.9

21.1

24.5

28.2

27.7

28.9

Oxidation reduction

7.0

6.1

7.2

7.4

8.4

7.1

Carbohydrate metabolic process

4.6

-

4.8

3.3

4.8

3.4

Regulation of transcription

3.2

4.3

-

4.1

4.3

3.2

Localization

7.5

6.2

8.1

7.1

5.0

9.3

Transport

3.8

5.1

4.3

6.1

4.7

5.0

Intracellular protein transport

1.9

-

3.0

-

-

3.4

Cellular process

7.6

12.2

7.9

13.5

6.2

11.1

Protein amino acid dephosphorylation

4.5

-

-

-

-

-

Protein amino acid phosphorylation

-

6.8

4.2

5.4

4.6

4.0

Response to stimulus

2.4

1.1

4.7

1.6

2.9

2.5

Molecular Function

Binding

23.2

27.1

25.8

28.4

27.9

27.7

Nucleotide binding

7.9

7.2

6.7

8.1

8.1

7.6

ATP binding

5.4

8.0

7.1

7.2

7.4

7.2

Protein binding

2.9

2.1

3.1

3.4

3.0

4.0

Metal ion binding

4.1

3.2

4.1

3.3

6.2

4.1

Catalytic activity

15.6

21.1

18.2

18.8

19.1

16.2

Protein Kinase activity

-

3

2

3

-

3

Protein serine/thromine kinase activity

-

3

-

-

-

2

Hydrolase activity

4.5

-

3.2

3.6

3.2

3.8

Nucleoside-triphosphatase activity

-

-

-

-

2

-

Oxidoreductase activity

4.2

4.1

4.6

4.4

4.6

4.3

Transferase activity

2.1

4.8

3.8

3.4

4.3

-

Structural molecule activity

-

-

-

3.8

-

-

Cell Complement

Intracellular

43.3

31.5

30.1

40.4

35.5

27.9

Chloroplast

-

5.5

2.8

-

-

-

Cytoplasm

19.8

5.7

13.8

11.2

20.1

9.8

Ribosome

9.8

5.2

4.4

10.1

4.6

7.7

Membrane

24.8

28.1

18.2

20.2

14.4

22.2

Extrisic to membrance

3.1

-

-

4.5

-

2.9

Integral to membrane

11.0

8.9

12.3

13.1

10.8

13.3

Nucleus

10.1

10.9

12.3

-

8.5

8.3

Apoplast

3.6

-

-

4.3

-

3.9