Studies of the Interactions between Weed Species and Crop Seedlings

Studies were made of isoenzyme patterns of three enzymes and of total soluble proteins from seedlings of three crop species which were grown in association with different weed species. The gel electrofocusing separation technique was used. Marked qualitative and quantitative changes were observed in peroxidase of cabbage (Brassica oleracea L. ) Seedlings when grown in association with weed plants, but no differences were observed when lettuce (Lactuca sativa L.) and tomato (Lycopersicum esculentum Mill.) were grown in association with weed species. No differences were found In total soluble proteins or the isoenzyme patterns of esterase and acid phosphatase.