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Plant Physiology 68:314-317 (1981)
© 1981 American Society of Plant Biologists

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Articles

Effect of Gibberellic Acid on Silica Content and Distribution in Sugarcane 1,2

Peter B. Kaufman, Najati S. Ghosheh3, Myong Lee, Thomas J. Carlson, John D. Jones, Ward Rigot, Wilbur C. Bigelow and Steve Kraus

Paul H. Moore

Department of Botany, University of Michigan, Ann Arbor, Michigan 48109, Division of Biological Sciences, Phoenix Memorial Laboratory, and Department of Materials and Metallurgical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States Department of Agriculture, Science and Education Administration, Agricultural Research, Hawaiian Sugar Planters' Association, Experiment Station, Aiea, Hawaii 96701

The effect of gibberellic acid on the content and distribution of silicon in the stem, leaf sheath, and leaf lamina of sugarcane was analyzed in relation to the effect of gibberellic acid on stem growth. Silicon content was measured by neutron activation analysis, and its distribution was followed by scanning electron microscopy and X-ray analysis.

Foliarly applied gibberellic acid increased stem length and fresh weight and decreased silicon content. Gibberellic acid treatments had little or no effect on growth or silicon content of leaf laminae or sheaths. The close correlation between increase in growth of an internode in response to gibberellic acid and the decrease in silicon content of that internode indicated a dilution effect of growth on the amount of silicon rather than a direct effect of gibberellic acid on silicon deposition. This conclusion was supported by scanning electrom microscopy, X-ray map photos, and counts of silica cells per unit of epidermis area.

3 Present address: Department of Biology, Eastern Michigan University, Ypsilanti, MI 48197.

1 This work was supported by Michigan Memorial Phoenix Project Grant 237 and NASA Grant NAGW-34.

2 Silica refers to SiO2·nH2O or silica gel, the deposition form of silicon (Si) in grasses and other living organisms which accumulate silica.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1981 by the American Society of Plant Biologists