The Allelochemicals Effect of Zygophyllum album on Control of Bromus tectorum

The aim of the present study was to investigate the potential allelopathic effects of different concentrations of Zygophyllum album (donor species) aqueous extract (2.5, 5, 7.5 and 10%) on germination percentage, plumule and radicle length of Bromus tectorum (weed) and Triticum aestivum (crop species) under laboratory conditions to have the greatest inhibitory allelopathic effect on the recipient species in mixed culture compared to that pure culture. The germination percentage, plumule and radicle length of B. tectorum in mixed culture was completely inhibited at the highest concentration of aqueous extracts of the donor species level the exerted weak measures as affected by the highest concentration level of donor in pure culture. This inhibition was markedly in obvious B. tectorum that is more sensitive to tested donor. The domineering effect of aqueous extract of the donor was more prominent on weeds than crop species. The variant response to the allelopathic substance could be related to the species specific growth regulatory effect of allelochemicals and concentration dependent. There is possibility of using these allelochemicals directly or as structural leads for the discovery and development of environment friendly herbicides to control weeds.