Effects of Primisulfuron and Terbufos on Growth and Acetolactate Synthase Activity in Several Corn Cultivars
1998
Piao R.Z. | Pyon J.Y. Dept. of agronomy, College of Agriculture, Chungnam National University, Taejon, 305-764 (Korea Republic)
Growth response and acetolactate synthase(ALS) activity were examined to determine the resistance of corn cultivars to primisulfuron when primisulfuron and/or insecticide Terbufos were applied. Pioneer 3571 IR showed resistance to primisulfuron regardless of Terbufos treatment, but Pioneer 3571 was greatly injured with primisulfuron plus Terbufos treatment. Suwon 118 was relatively tolerant to primisulfuron compared to Chalok 2, but crop injury was occurred at both cultivars by primisulfuron plus Terbufos treatment. ALS activity at Pioneer 3751 IR was very high in primisulfuron and/or Terbufos treatment. Suwon 118 also showed higher ALS activity compared to Pioneer 3751 and Chalok 2, but ALS activities were greatly decreased by primisulfuron plus Terbufos treatment at Suwon 118 and Chalok 2. The I50 concentration for 50% inhibition of the ALS enzyme was 10.0, 0.06, 7.75, and 0.04 micro M for Pioneer 3751 IR, Pioneer 3751, Suwon 118, and Chalok 2, respectively. Consequently, resistance of corn cultivars to primisulfuron was significantly related to ALS activity. Crop injury and lower ALS activity were recognized in susceptible corn cultivars by primisulfuron plus Terbufos treatment.
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