Abstract
Benzothiadiazole (BTH) was found to be highly effective in increasing resistance of two poinsettia cultivars — ‘Coco White’ and ‘Malibu Red’, moderately susceptible to the fungus Botrytis cinerea. BTH applied at a concentration of 0.3 mM on the discs cut out from the leaves of these poinsettia cultivars reduced disease symptoms by more than 60 % in comparison to the control discs treated with water and exposed to infection.
It was also observed that the applied inducer at a concentration of 0.03 and 0.3 mM had a favourable influence on the increase of poinsettia systemic resistance of SAR type (systemic acquired resistance). The effectiveness of BTH was much less when disease development was examined on detached leaves (a 20 % reduction of lesion area) in comparison with a pronounced inhibition of grey mould development on intact leaves of previously induced plants (a 80 % protection of intact plants).
Benzothiadiazole in the concentration range from 0.03 to 1.4 mM added to in vitro agar medium was not found to have an inhibitory influence on Botrytis cinerea mycelium growth and sporulation.
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Abbreviations
- LAR :
-
local acquired resistance
- SAR :
-
systemic acquired resistance
- BTH :
-
benzothiadiazole (benzo [1,2,3] thiadiazole — 7 — carbothioic acid S — methyl ester
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Kułek, B., Floryszak-Wieczorek, J. Local and systemic protection of poinsettia (Euphorbia pulcherrima Willd.) against Botrytis cinerea Pers. induced by benzothiadiazole. Acta Physiol Plant 24, 273–278 (2002). https://doi.org/10.1007/s11738-002-0051-3
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DOI: https://doi.org/10.1007/s11738-002-0051-3