Abstract
Response of pepper (Capsicum annuun L.) cultivars to imazethapyr {2-[4, 5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridine carboxylic acid} was evaluated at the whole plant and enzyme levels. Red Top and Happy Dry demonstrated 4-fold tolerance to imazethapyr in terms of plant height and dry weight compared to Korea and Hanam. Acetolactate synthase (ALS) levels showed that the concentrations of imazethapyr required for 50% in vitro inhibition of ALS activity were 10 times greater at the tolerant cultivars compared to the susceptible ones. These data suggest that the level of tolerance by the ALS enzyme may be related to observed whole plant tolerance to imazethapyr.
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