1Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094 China.
2College of Plant Protection, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100 China.
3University of Hohenheim, Stuttgart 70599 Germany.
*Correspondence Author: E-mail: yqzheng@ippcaas.cn
The allelopathic effects of wheat aqueous extracts and wheat secondary metabolite 2,4-dihydroxy-7-methoxy-1, 4-benzoxazin-3-one (DIMBOA) were studied on weeds. The results showed that there was a negative correlation between the density of wheat seedlings and germination inhibition of weed seeds. Wheat aqueous extracts inhibited the seedlings growth of weeds: D. sanguinalis, Poa annua L., A. retroflexus L., E. crusgalli L., A. fatua L., with IC50 [the concentration to reach 50% inhibitory effects (mg/ml)] (root) < 1.5 mg/ml and IC50 (stem) < 3.0 mg/ml, but had no inhibitory effects on Lolium multiflorum Lam. and Ipomoea hederacea var. integriuscula L. There was no significant correlation between the aqueous extracts concentration and weeds germination inhibition, except in D. sanguinalis. DIMBOA allelopathic effects on weeds followed the order: A. retroflexus L. > D. sanguinalis > A. fatua L., with IC50 (root, stem) < 1.5 mg/ml and IC50 (seed germination) < 3.5 mg/ml. The DIMBOA was more potent than aqueous extracts in terms of IC50.
Allelopathy, Amaranthus retroflexus, Avena fatua, bioactivity, Digitaria sanguinalis, DIMBOA, Echinochloa crusgalli, Ipomoea hederacea, Lolium multiflorum, Poa annua, secondary metabolite, Triticum aestivum, weeds, wheat seedlings
