Table 7 Populus gene models whose ESTs are specific to a unique library and comparative numbers of the corresponding genes in Arabidopsis. Libraries: (I) senescing leaves, (F) flower buds, (T) shoot meristem, (V) male catkins, (AB) cambial zone, (UB) active cambium, (G) tension wood, (X) wood cell death.

Pt816035

I

PtVFCYSPRO.1

1

2

Pt814139

F

Proteasome subunit beta type 2-2

1

3

Pt781583

I

RD21 Papain-Like cysteine protease

9

5

Pt678915

T

Proteasome subunit beta type 2-2

1

3

Pt666563

V

PtCYSP2.1

4

4

Pt722254

I

RD21 Papain-Like cysteine protease

9

5

Pt721246

F

aminoacylase

1

2

Pt830360

F

20S proteasome alpha subunit F

1

2

Pt717215

AB

Proteasome subunit alpha type 6-1

1

2

Pt417380

UB

aminopeptidase M

1

5

Pt419163

F

20S proteasome beta subunit.

1

2

Pt713305

V

Proteasome subunit

1

3

Pt747519

I

similar to SAG12

1

7

Pt819223

G

Metallopeptidase M24 family protein

1

3

Pt706718

I

PtDeg1

1

1

Pt410970

I

PtFtsH5.1

1

3

Pt585288

I

PtFtsH8.3

1

3

Pt709916

X

subtilase family protein

1

3

Pt559264

AB

Proteasome subunit beta type 3-2

2

2