Allelopathic effects of Sonchus oleraceus L. on the germination and seedling growth of crop and weed species

Acta Botanica Brasilica

Nasr Hassan Gomaa²  Mahmoud Omar Hassan²  Gamal Mohammad Fahmy¹  Luís González¹  Ola Hammouda²  Atteya Mostafa Atteya² 

[1] ,Beni-Suef University Faculty of Science Department of Botany & MicrobiologyBeni-Suef,Egypt

关键词: Allelochemicals;    aqueous extract;    bioherbicide;    phytotoxicity;   

DOI  :  10.1590/0102-33062014abb3433

来源: SciELO

【 摘 要 】

We assessed the allelopathic effects of the aqueous extract of Sonchus oleraceus dry shoots on the germination and seedling growth of Trifolium alexandrinum, three weed species (Brassica nigra, Chenopodium murale and Melilotus indicus) and S. oleraceus itself. We assayed four different concentrations of the aqueous extract (w v-1): 1%, 2%, 3% and 4%. To determine whether the effects of the extract were attributable to the presence of allelopathic compounds, its osmotic potential or both, we prepared concentrations of polyethylene glycol (PEG) with osmotic potentials equivalent to those of the aqueous extract. All concentrations of the plant extract completely inhibited the germination and seedling growth of C. murale. The lowest concentration of the plant extract partially inhibited germination and seedling growth of B. nigra, M. indicus and S. oleraceus, whereas the higher concentrations inhibited those parameters completely. The germination of T. alexandrinum was not affected by the aqueous extract at 1% or 2%. In general, the aqueous extracts were more effective in inhibiting seed germination and seedling growth than were the PEG solutions. Phytochemical analyses revealed that phenols and alkaloids were the most abundant compounds in S. oleraceus dry matter. Our results suggest that the aqueous extract of S. oleraceus has an allelopathic effect on some weeds, and its usefulness as a bioherbicide therefore merits further study.

【 授权许可】

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