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Bean rust as a model system to evaluate efficiency of teliospore induction, especially in the potential mycoherbicide Puccinia punctiformis


, : Bean rust as a model system to evaluate efficiency of teliospore induction, especially in the potential mycoherbicide Puccinia punctiformis. Weed Research 34(4): 275-281

The use of teliospores of the rust fungus Puccinia punctiformis (Str.) Rohl., a potential mycoherbicide against the dicotyledonous weed Cirsium arvense (L.) Scop. has shown promise. Methods to increase teliospore production for systemic infections were investigated using two dicotyledonous host-pathogen systems, the thistle rust and the bean rust (Phaseolus vulgaris-Uromyces appendiculatus). Three different approaches (culture filtrate extracts of different Aphanofadium album strains, application of Ajoen and dark periods) were tested for their capacity to induce teliospore production in the above-mentioned host-pathogen systems. The methods significantly increased the teliospore production in the model system (bean-rust), although differing in the order dark period gt A. album extract gt ajoen. The effect of the A. album extract depends on the strain used. A two-day dark period increased the teliospore production of bean rust in addition to precipitating its onset. The same effect was noted for thistle rust using A. album extract. The advantage of bean rust as a model organism together with combined applications and host pathogen reaction mechanisms are discussed.

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