Abstract
1. The intensity of growth inhibition caused by 2, 4-D application, such as decrease in number of living leaves, degree of leaf greenness, and morphological injury were in the following order: Monochoria vaginalis>Rotala indica, Ammannia multiflora>Cyperus difformis>Echinochloa crus-galli.2. Evolution of ethylene caused by 2, 4-D was greater in broad-leaf weeds, M. vaginalis, R. indica and A. multiflora than C. difformis, E. crus-galli and rice plants.3. The growth inhibition and morphological injury caused by ethylene were less than caused by 2, 4-D. However, both inhibition and injury caused by 2, 4-D were increased by the addition, regardless of the kind of weed.4. A part of the growth inhibition and morphological injury caused by 2, 4-D in broad-leaf weeds is assumed to be caused by ethylene evolution by the chemical stress.
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