New Gene Name
Previous Gene Name(s)
AGI ID Gene Structure
Group 1

At-XTH1

At4g13080

At-XTH2

At4g13090

At-XTH3

At3g25050

At-XTH4
EXGT-A1 or EXT
At2g06850

At-XTH5
EXGT-A4 or XTR12
 At5g13870

At-XTH6
XTR10
 At5g65730

At-XTH7
XTR15
 At4g37800

At-XTH8

At1g11545

At-XTH9
EXGT-A6 or XTR16
 At4g03210

At-XTH10
XTR14
 At2g14620

At-XTH11

At3g48580
Group 2

At-XTH12

At5g57530

At-XTH13

At5g57540

At-XTH14
XTR9
 At4g25820

At-XTH15
XTR7
 At4g14130

At-XTH16

At3g23730

At-XTH17
XTR1
 At1g65310

At-XTH18

At4g30280

At-XTH19

At4g30290

At-XTH20

At5g48070

At-XTH21
XTR17
 At2g18800

At-XTH22
TCH4
 At5g57560

At-XTH23
XTR6
 At4g25810

At-XTH24
Meri5
 At4g30270

At-XTH25
EXGT-A5 or XTR3
 At5g57750

At-XTH26
XTR18
 At4g28850
Group 3

At-XTH27
EXGT-A3
 At2g01850

At-XTH28
EXGT-A1 or XTR2
 At1g14720

At-XTH29
XTR13
 At4g18890

At-XTH30
XTR4
 At1g32170

At-XTH31
ATXG or AtXTR8
 At3g44990

At-XTH32

At2g36870

At-XTH33

At1g10550

Table 1: Systematic nomenclature and gene structure of the Arabidopsis XTH gene family. The family of 33 Arabidopsis XTH genes is shown divided into three major groups (see also Fig. 2). Each gene has the new systematic XTH nomenclature, the previously used common names, the designated identification number assigned by the Arabidopsis Genome Initiative and a schematic diagram of the corresponding gene structure. Exons are shown as open boxes and introns as lines. The crosshatched boxes indicate a putative signal peptide directing secretion of the polypeptide into the cell wall and the filled boxes represent the DEIDFEFLG motif that is thought to correspond to the XTH catalytic site (Rose et al. 2002 ).

New Gene Name
Previous Gene Name(s)

Database IDa

SlXTH1

LeEXT

(Catalá et al. 1997)

gb D16456; TC162611

SGN-U215539

SlXTH2

LeXET2

(Catalá et al. 2001)

gb AF176776; 163540

SGN-U215153

SlXTH3b

gb AY497476; TC153904

TC153905; TC154605

SGN-U213043;

SGN-U213044

SlXTH4

LeXET4

(Chen et al. 2002)

gb AF186777; TC166485

SlXTH5b

gb AY497475 TC161980

SGN-U213444

SlXTH6b

gb AY497477; 155091

  N-U215860

SlXTH7b

gb AY497478; 157241

SGN-U220494

SlXTH8

ETAG-A3

gb AB036338; 156974

SGN-U213679

SlXTH9b

gb AY497479; 162660

SGN-U216405

SlXTH10

LetXET-B2

(Arrowsmith and de Silva 1995)

gb X82684; TC154659;

  SGN-U213454

SlXTH11

LetXET-B1 (Arrowsmith and de Silva 1995)

gb X82685; TC164317

SGN-U213455

SlXTH12

LeBRI1

(Koka et al. 2000)

gb AF205069; 154952

SGN-U215382

SlXTH13p

TC160407; SGN-U221639

SlXTH14

TC164033; SGN-U219308

SlXTH15p

TC163748; SGN-U218042

SGN-U218043

SlXTH16p

gb DQ098654; TC163780;

SGN-U217823

SlXTH17p

TC162661; SGN-U217975;

SGN-U217974

SlXTH18

TC168577; SGN-U224493

SlXTH19p

TC159664; SGN-U220883

SlXTH20p

TC161367; SGN-U223918

SlXTH21p

TC168701; SGN-U213678

SlXTH22p

EST303652; SGN-U226745

SlXTH23

EST256076; EST338030

SGN-U224413

SlXTH24p

EST546506; SGN-U241086

SlXTH25p

EST541828; SGN-U238267

a gb: Genbank accession no.; TC, The Institute for Genomic Research Assembly number (http://www.tigr.org/tigr-scripts/tgi/T_reports.cgi?species=tomato) .; EST, The Institute for Genomic Research EST identifier; SGN, Solanaceae Genomics Network Unigene build number.
b cDNAs amplified and sequenced by the authors using sequence information from the corresponding TCs in The Institute for Genomic Research database;
p partial length sequences; (IG, immature green; MG, mature green; Br, breaker; RR, red ripe)

Table 2: Systematic nomenclature of the Tomato XTH gene family
Systematic Gene Name
Previous Gene Name
RiceGAASa
GeneBankb
Chromosomec
OsXTH1 OJ2027_B02.20 AP003899 7
OsXTH2 OsXTR1 OSJNBa0007D07.03 AC136481 11
OsXTH3 OsXTR4 OSJNBb0015D13.12 AL606650 4
OsXTH4 OJ1217_D10.02 AP003907 8
OsXTH5 P0031C02.06 AP004657 8
OsXTH6 OSJNBa0041A02.39 AL606638 4
OsXTH7 OSJNBb0015N08.21 AL662996 4
OsXTH8 P0682A06.10 AP004705 8
OsXTH9 OSJNBa0041A02.36 AL606638 4
OsXTH10 P0028E05.21 AP005445 6
OsXTH11 OsXTR2 P0028E05.28 AP005445 6
OsXTH12 P0028E05.24 AP005445 6
OsXTH13 P0669G10.02 AP005398 2
OsXTH14 P0669G10.04 AP005398 2
OsXTH15 OSJNBa0012F14.38 AP004784 6
OsXTH16 OSJNBb0015N08.20 AL662996 4
OsXTH17 P0682A06.21 AP004705 8
OsXTH18 P0028E05.26 AP005445 6
OsXTH19 OJ1384D03.12 AC113930 3
OsXTH20 OSJNBa0001O14.09 AC025783 10
OsXTH21 OJ1624_G09.09 AP003839 7
OsXTH22 OJ1136_C04.15 AP004026 2
OsXTH23 OsXTR3 B1053A04.21 AP005859 2
OsXTH24 OSJNBb0060O08.26 AC120506 3
OsXTH25 OSJNBa0027L23.23 AC018929 10
OsXTH26 P0576F08.35 AP004886 2
OsXTH27 OSJNBa0023I19.12 AP079037 10
OsXTH28 OSJNBa0060E18.16 AC118981 3
OsXTH29

P0705B06.23
AP005430
9

a Gene no. assigned by RiceGAAS (http://RiceGAAS.dna.affrc.go.jp, February 6, 2003)
b GenBank accession nos. of the Genomic DNA
c Chromosome no

Table 3. Identification of XTH genes in the rice genome

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