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Plant Physiology 58:380-386 (1976)
© 1976 American Society of Plant Biologists

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Articles

Production of Cell Wall Hydrolyzing Enzymes by Barley Aleurone Layers in Response to Gibberellic Acid 1

Lincoln Taiz and William A. Honigman2

a Division of Natural Sciences, Thimann Laboratories, University of California, Santa Cruz, California 95064

The cell walls of barley (Hordeum vulgare var. Himalaya) aleurone layers undergo extensive degradation during the tissue's response to gibberellic acid. Previous work had shown that these cell walls consist almost entirely of arabinoxylan. In this study we show that gibberellic acid stimulates endo-beta-1,4-xylanase activity in isolated aleurone layers. In addition, gibberellic acid enhances the activity of two glycosidases: beta-xylopyranosidase and {alpha}-arabinofuranosidase. No gibberellic acid-stimulated cellulase activity was detected. Germination studies showed a similar pattern of enzyme development in intact seeds.

2 Present address: Department of Molecular Biology, University of California, Irvine, Calif. 92664.

1 This research was supported in part by Grant BMS75-03391 from the National Science Foundation to L.T. and by a grant from the Faculty Research Committee, University of California, Santa Cruz, to L.T.




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R. C. Lee, M. Hrmova, R. A. Burton, J. Lahnstein, and G. B. Fincher
Bifunctional Family 3 Glycoside Hydrolases from Barley with alpha -L-Arabinofuranosidase and beta -D-Xylosidase Activity. CHARACTERIZATION, PRIMARY STRUCTURES, AND COOH-TERMINAL PROCESSING
J. Biol. Chem., February 7, 2003; 278(7): 5377 - 5387.
[Abstract] [Full Text] [PDF]


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Copyright © 1976 by the American Society of Plant Biologists