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Plant and Cell Physiology, 1973, Vol. 14, No. 1 157-168
© 1973

Article

Studies on trehalase in Saccharum spp. leaf and storage tissues

Alex G. Alexander1

Agricultural Experiment Station, University of Puerto Rico Mayaguez Campus, Rio Piedras, Puerto Rico

Trehalase properties and behavior were examined in commercial sugarcane varieties (predominandy S. officinarum), pure S. spontaneum clones, and pure S. robustum clones propagated in sand culture. The standard commercial variety, P. R. 980, contained trehalase in all tissues except the leaf sheath, widi greatest activity localized in expanding internodes and spindle leaves. Optimum pH was 6.0 and the Michaelis constant was 6.3 × 10–4 M for trehalose. Foliar experiments based on leaf rank, variable illumination, and diurnal sugar and enzyme changes gave no evidence of trehalase involvement in sugar transport processes. Activity levels ranged from 4- to 10-fold higher in S. spontaneum clones than in commercial varieties. Present evidence suggests a trehalase role in sugar utilization rather than sugar storage which favored the evolutionary survival of primitive Saccharum forms.

1Present address: Biophysics Program, Washington State University, Pullman, Washington 99163, U.S.A.

(Received July 4, 1972; )
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