Abstract
The involvement of β-D-glucosidase activity in grey mould was studied in two ornamental plant species attacked by Botrytis cinerea.
β-D-glucosidase activity in the susceptible pelargonium cultivar ‘Shiva’ gradually increased with the disease development in the leaf spots and their surroundings. The endogenic level of the studied hydrolase in the resistant pelargonium ‘Cascade’ was several times higher than in the susceptible cultivar ‘Shiva’ and in principle underwent no changes after inoculation.
The postinfection increase in the activity of β-D-glucosidase noted in the leaves of the susceptible poinsettia cultivar ‘Malibu Red’ was evidently weaker in the intensity, but its tendencies were similar to those of the susceptible pelargonium cultivar. In the leaves of the medium-resistant poinsettia ‘Coco White’ the constitutional level of β-D-glucosidase was 2-3-fold higher in that cultivar than in the susceptible cv. ‘Malibu Red’. In attacked leaves of ‘Coco White’, the enzyme activity continued to increase temporarily until the 3rd h after inoculation.
The process of healthy leaf senescence in both species had no significant influence on the change of the studied enzyme activity which was generally low. A high activity of β-D-glucosidase was also observed in the homogenate prepared from mycelium and in the fungal spores.
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Kułek, B., Floryszak-Wieczorek, J. & Jackowiak, H. b-D-glucosidase activity in pelargonium and poinsettia leaves infected by Botrytis cinerea Pers. ex Fr.. Acta Physiol Plant 26, 95–102 (2004). https://doi.org/10.1007/s11738-004-0049-0
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DOI: https://doi.org/10.1007/s11738-004-0049-0