Plant Physiol. Drug Metab Dispos
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Plant Physiology 76:739-742 (1984)
© 1984 American Society of Plant Biologists

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Articles

Pea Xyloglucan and Cellulose 1

III. Metabolism during Lateral Expansion of Pea Epicotyl Cells

Takahisa Hayashi2 and Gordon Maclachlan

Department of Biology, McGill University, Montreal, Quebec, Canada H3A 1B1

Lateral expansion of the third internodes of pea epicotyls was evoked by treatment with either 2,4-dichlorophenoxyacetic acid (2,4-D) or ethylene gas. During growth, 2,4-D enhanced and ethylene inhibited the deposition of xyloglucan and cellulose in the cell wall, with the result that the wall framework (ghost) from ethylene-treated swollen tissue was much thinner than that from 2,4-D-treated. The level of activity of xyloglucan synthase, alkali-insoluble beta-glucan synthases, and endo-1,4-beta-glucanases were all enhanced by 2,4-D treatment but not by ethylene. Both 2,4-D and ethylene treatments led to increased osmotic potential in the swelling tissues. Accordingly, swelling after 2,4-D treatment was accompanied by xyloglucan degradation, concomitant with substantial net synthesis, but swollen tissue as a result of ethylene treatment was characterized by walls whose integrity was weakened by relatively low levels of newly deposited polysaccharides rather than by the degradation.

2 Current Address: ARCO Plant Cell Research Institute, Dublin, CA 94568.

1 Supported by grants from the Natural Sciences and Engineering Research Council of Canada and le Programme des Formation de Chercheurs et d'Action Concertée du Quebec.




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