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Table 3 Deduced polysaccharide compositions of the cell walls and fractions from collenchyma strands from middle petiole segments

From: Polysaccharide compositions of collenchyma cell walls from celery (Apium graveolens L.) petioles

Polysaccharides

Composition mol %a

 

HEPES

Cell walls

CDTA

Na2CO3

1 M KOH

4 M KOH

Residue

Glycosyl linkages

HG

6.8 (5.8)

18

68.4

48.0

9.3

5.7

5.8

4-, 4,6-, t-GalpA

RG-I backbone

5.2 (4.0)

3.0

7.0

15.7

6.2

5.2

0.9

2-, 2,4-Rhap; 4-GalpA

Arabinan (RG-I)

6.7 (7.1)

2.7

8.7

12.8

5.2

3.3

0.4

3-, 5-, 3,5-, t-Araf

(Arabino) galactans (RG-I)

1.1 (1.2)

1.4

2.0

4.3

1.6

1.8

0.8

4-, t-Galp

RG-II

0.8 (1.2)

1.9

9.0

8.7

1.7

1.3

0.9

2,4-, 3,4-, t-GalpA; t-Fucp; t-Araf; 2,4-, t-Galp; t-Rhap

Type II Arabinogalactans (AG-II)

18.9 (20.0)

1.0

1.4

3.4

1.9

1.8

0.7

3-, 6-, 3,6-, 3,4,6-, t-Galp; t-Araf; t-Arap; 4-, t-GlcpA; t-Rhap

HXs

47.9 (43.4)

4.2

0.5

1.1

36.9

5.5

0.2

4-, 2,4-, 2,3,4-, t-Xylp; 4-, t-GlcpA; t-Araf

XGs

4.5 (10.5)

7.5

-

-

23.1

52.0

0.8

2-, t-Xylp; 4-, 4,6-Glcp; 2-, t-Galp; t-Fucp

HMs

2.5 (1.9)

4.8

0.8

1.7

10.3

15.6

1.8

4-, 4,6-Manp; 4-, 4,6-Glcp; 2-, t-Galp

Cellulose

-

51.3

-

-

-

-

84.9

4-Glcp

Otherb

5.7 (5.0)

4.1

2.2

4.3

3.9

7.9

2.7

4-, 2,4-, 3,4-, 4,6-, 3,4,6-, 2,3,4,6-, t-Glcp; t-Xylp; 4-, t-GlcpA;

  1. () Values represent HEPES fraction from upper segment of the collenchyma in celery petioles
  2. Note: The deduced polysaccharides from fractions may contain only part of the glycosyl linkages listed in the last column
  3. amol% of total polysaccharides present in the fractions, calculated from the mol% of methylated alditol acetates characteristic of polysaccharides
  4. bGlycosyl linkages that cannot be assigned to well-defined cell wall polysaccharides
  5. - Not detected