Cellulase activity and localization during induced abscission of Coleus blumei |
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Authors: | Lisa M Baird Philip D Reid |
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Institution: | (1) Department of Biology, University of San Diego, 92110 San Diego, California, USA;(2) Department of Biological Sciences, Smith College, 01063 Northampton, Massachusetts, USA |
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Abstract: | Treatment with dimethipin (2,3-dihydro-5,6-dimethyl-1,4-dithiin 1,1,4,4 tetroxide) inhibited the increase in cellulase activity and decrease in breakstrength associated with the normal course of abscission in Coleus. Application of the surfactant UBI-1126 (Emery OAL 20 in isopropyl alcohol) increased cellulase activity and accelerated the process of abscission in Coleus expiants within 24 h of application. Cellulase activity was localized histochemically at the electron microscopic level in surfactant-treated tissue. The enzyme activity was localized primarily in the cell wall, middle lamella, and paramural bodies of abscission zone cells. |
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