1Yunnan Academy of Agricultural Sciences, Kunming 650205, China.
2The Center for Agricultural Diversity Research and Training, Kunming 650201, China.
4China National Rice Research Institute, Hangzhou 310006, China.
3USDA-ARS, Dale Bumpers National Rice Research Center, P.O. Box 1090, Stuttgart, AR 72160, USA.
Allelopathic potential in wild rice species against barnyardgrass (Echinochloa crus-galli L., Beauv.) was evaluated in bioassay and pot experiments in greenhouse and laboratory. Two wild rice accessions of S46 (Oryza barthii) and S72 (O. rufipogon) significantly reduced the plant height and dry weight of barnyardgrass. While, a wild rice accession of S37 (O. longistaminata) reduced the barnyardgrass germination rate significantly. The inhibitory effects of wild rice on the weed was greater during the rice elongation stage than at the reviving stage. Accessions S68 and S72 increasingly inhibited the plant height and dry weight of barnyardgrass as the distance between rice and weed plants decreased. Raw extracts from S37 were more inhibitory to the emergence rate, root length and seedling height of barnyardgrass than other accessions of wild rice.
Allelopathy, competition, Echinochloa crus-galli, Oryza barthii, O. longistaminata, O. nivara, O. rufipogon
