Between the Constituent Polymers in Primary Cell-Walls of Dicots

Interconnections Between the Constituent Polymers in Primary Cell-Walls of Dicots 

In earlier Sections, the individual polymers that make up the constituent parts of the primary cell-wall have been discussed, and partial structures proposed for some of these polymers are shown in Figs. 1-4. A model of the primary cell-wall of suspension-cultured sycamore-cells, illustrating proposed interconnections between these constituent polymers within the intact wall, has been constructed by Albersheim and his associates.5,10 57,64,65 The model, not designed to be spatially or quantitatively accurate, is depicted in Fig. 6. 

This generalized model for the cell wall of dicots has, by no means, received general acceptance. In particular, the occurrence of arabinoga- 

Attachment of the neutral pectic polysaccharides, galactan and ara-binan, to rhamnogalacturonan has been established from a number of lines of evidence. Purified Colletotrichum lindemuthianum endopolyga-lacturonase, free from arabinanase and galactanase activities, solubilizes, 

The possibility of other types of noncovalent interactions between the pectic polysaccharides and other cell-wall polymers must be borne in mind,30 251 but there is at present little evidence to indicate that such interactions do exist in the primary cell-wall (see also, Section IX,3). 

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