Elongation growth

Pritchard, J., Tomos, A.D. Wyn Jones, R.G. (1987). Control of wheat root elongation growth. I. Effects of ions on growth rate, wall rheology and cell water relations. Journal of Experimental Botany, 38, 948-59. 

There is thus some evidence for the tight binding of enzymes, especially glycosidases, to cell walls in both dicots and monocots. The nature and localization of these enzymes suggest that they may, perhaps, play a role in wall breakdown and such other processes as elongation growth. The membrane systems of plant cells are known to be involved in the transport, and introduction, of polysaccharides into the cell wall247-249 enzymes localized in the wall may also play a part in the metabolism of these polymers when they are transferred from the membrane system to the wall. 

The detailed structure, and the significance, if any, of this wall fragment in elongation growth, are areas of further investigation. 

It is now generally accepted that auxin and low-pH-induced stimulation of elongation growth results from a temporary weakening or relaxation of the wall.400,469,470,473-477 There is some evidence that such hormones as auxin activate, within the cell membrane, ion pumps that lower the pH of the wall,400,468,477,478-481 and it was suggested that the direct... 

P. Albersheim, Primary Cell Walls and control of elongation growth. Ann. Proc. Phytochem. Soc., 10 (1975) 145. 

Gibberellic acid itself seemed to slightly stiaailate root elongation growth of etiolated radish seelings, especially in the later stages of development [681. 

Figure 9. Cumulative periodogram of an elongational growth series.

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