الفهرس 
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Abstract
The present study is an endeavor to investigate the allelopathic potentiality of the common exotic noxious weed; Nicotiana glauca on seed germination, seedling growth and protein expression of two important economic crops; Medicago sativa and Triticum aestivum and two important leafy vegetable species; Eruca sativa and Raphanus sativus by testing their shoots aqueous extract (NGSAE) and shoots crude powder (NGSCP).
In the present study, bioassay indicated that the inhibitory effect varied with the origin, the extracts concentration and the target plants. The germination of the recipient species affected differentially by NGSAE. For example, in M. sativa the maximum germination percentage (GP) was achieved at 25 and 50% NGSAE (stimulation effect of the extract). Whereas 100% NGSAE achieved a value of 96.70% for germination similar to that achieved by the control. With regard to T. aestivum GP was stimulated at 100% NGSAE compared to the other concentrations. With respect to the leafy vegetable species, GP of E. sativa seeds attained their maximum value (93.3%) at control and 1% NGSAE and the maximum inhibition percentage (IP) was exhibited at 100% NGSAE. GP of R. sativus seeds attained their maximum value (100%) at control and 100% concentration levels. Consequently, the maximum IP was achieved at 25% extract concentration level which indicates the suppression effect of the extract.
Radicle (RL) and coleoptile (CL) lengths of the recipient species were found to be affected by different aqueous extracts of N. glauca. RL was inhibited differentially by NGSAE for all the test species. Though, recipient species are arranged in the order: E. sativa> M. sativa > T. aestivum > R. sativus concerning the degree of sensitivity to NGSAE.