H.M. Abou-Zeid, S.M. EL-Darier
Department of Botany and Microbiology, Faculty of science, Alexandria University, Alexandria, Egypt
Key words: Allelopathy, Eucalyptus, Chenopodium, Portulaca, seed germination, seedling growth.
Eucalyptus rostrata is known to contain various substances that are allelopathic. The allelopathic effect of leaf (ERLAE) and bark (ERBAE) of Eucalyptus rostrata aqueous extracts was evaluated for their potential uses as control on seed germination and seedling growth of two noxious weeds; Chenopodium album and Portulaca oleracea. The biological activity of the two types of extracts on germination efficiency differs with respect to the type of extract and the recipient species. Assertively, the consequence of the extracts on the two weeds was in the following order: ERLAE > ERBAE and almost, the action was highly effective and significant in C. album compared to P. oleracea. The reduction in plumule and radical lengths for the two recipient plants in the present study may be attributed to the reduced rate of cell division and cell elongation due to the presence of allelochemicals in the aqueous extracts. In conclusion, the obtained results in the present study may share in solving the problem of heavy use of synthetic herbicides via application and trying of a number of promising medicinal plants rich in allelochemicals such as E. rostrata.
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