ZESZYT Nr 10/ 2012 Abstrakty Volume No. 10/2012 Abstracts |
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| 1. The
mechanism of resistance to ALS-inhibiting herbicides in biotypes of
wind bent grass (Apera spica-venti L.) with cross and multiple
resistance - Kazimierz Adamczewski, Kinga Matysiak Abstract. The aim of the greenhouse experiments was to study the mechanism of cross- and multiple resistance of A. spica-venti to inhibitors of acetolactate synthesis (ALS). To determine the type of resistance to sulfonylurea herbicides, green mass of over ground parts of A. spica-venti plants was collected and examined. Of 3 tested weed biotypes characterized by cross resistance to sulfonylurea herbicides, 2 biotypes (R2 and R3) showed ALS gene point mutation at position Pro-197 conferring ALS targetsite-resistance. Within the group of 3 biotypes showing multiple resistance to ALS and acetylCoA carboxylase (ACCase) inhibitors the biotypes R4 and R6 with specifi c gene point mutation at position Pro-197 were also detected. The sulfometuron showed to be a useful tool to study weed resistance to sulfonylurea herbicides. key words: Apera spica-venti, herbicides, chlorsulfuron, fenoxaprop-P-ethyl, sulfometuron, mechanism of resistance |