Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 69:323-326 (1982)
© 1982 American Society of Plant Biologists

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Articles

Effect of IAA on Growth and Soluble Cell Wall Polysaccharides Centrifuged from Pine Hypocotyl Sections 1

Maurice E. Terry2, David McGraw3 and Russell L. Jones4

Department of Botany, University of California, Berkeley, California 94720

Auxin-induced elongation and cell wall polysaccharide metabolism were studied in excised hypocotyl sections of ponderosa pine (Pinus ponderosa) seedlings. Sections excised from hypocotyls of ponderosa pine elongate in response to the addition of auxin. The neutral sugar composition of the extracellular solution removed from hypocotyl sections by centrifugation was examined. In cell wall solution from freshly excised sections, glucose, galactose, xylose, and arabinose make up more than 90% of the neutral sugars, while rhamnose, fucose, and mannose are relatively minor components. The neutral sugar composition of the polysaccharides of the pine cell wall solution is both qualitatively and quantitatively similar to that of pea. Following auxin treatment of pine hypocotyls, the neutral sugar composition of the cell wall changes; glucose, xylose, rhamnose, and fucose increase by nearly 2-fold relative to controls in buffer without auxin. These changes in neutral sugars in response to auxin treatment are similar to those found in pea, with the exception that in pea, rhamnose levels decline in response to auxin treatment.

2 Current address: Department of Plant Pathology and Crop Physiology, Louisiana State University, Baton Rouge, LA 70803.

3 Current address: Department of Biology, Mount Royal College, Calgary, Alberta, Canada T3E 6K6.

4 To whom reprint requests may be addressed.

1 Supported by Grant PCM-78-13286 from the National Science Foundation.






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