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. 1987 Sep;85(1):261–267. doi: 10.1104/pp.85.1.261

Cell Wall Proteins at Low Water Potentials 1

Connie S Bozarth 1,2,2, John E Mullet 1,2, John S Boyer 1,2
PMCID: PMC1054238  PMID: 16665667

Abstract

We investigated the proteins extractable from cell walls of stem tissues when plants were subjected to low water potentials (low ψw). Dark-grown soybean seedlings (Glycine max [L.] Merr.) showed decreased stem growth when the roots were exposed to vermiculite having low water content (ψw = −3 bar). After a time, growth resumed but at a reduced rate relative to the controls. The extractable protein increased in the cell walls as ψw decreased, especially a 28-kilodalton protein in the young tissue. In contrast, a 70 kilodalton protein, mainly extractable from mature cell walls, appeared to decrease slightly at low ψw. No hydroxyproline was present in either protein, which shows that neither protein is related to extensin. The level of the 28 kilodalton protein increased in the cell wall of the dividing region soon after the initial growth inhibition, and it appeared in the elongating tissue at about the time growth resumed. The correlation between growth and these protein changes suggests that the two events could be related.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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