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| Gomaa,Nasr Hassan; Hassan,Mahmoud Omar; Fahmy,Gamal Mohammad; González,Luís; Hammouda,Ola; Atteya,Atteya Mostafa. |
| Annual sowthistle (Sonchus oleraceus) has been reported to produce allelopathic effects. Two greenhouse experiments were conducted to estimate the allelopathic potential of both plant residue and root exudates of S. oleraceus on flavonoid composition and nodulation in a leguminous crop, Trifolium alexandrinum, and in two leguminous weeds, Melilotus indicus and T. resupinatum. The results of high performance liquid chromatography-mass spectrometry (HPLC-MS/MS) showed that all three legumes contained six flavonoid aglycones: apigenin, daidzein, kaempferol, luteolin, myricetin and quercetin; and seven flavonoid glycosides: daidzin, genistin, hesperidin, hyperoside, kaempferol-7-O-glucoside, naringin and rutin. In general, both plant residue and root exudates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelopathy; Flavonoids; Legumes; Nodulation; Sonchus oleraceus. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400553 |
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| Gomaa,Nasr Hassan; Hassan,Mahmoud Omar; Fahmy,Gamal Mohammad; González,Luís; Hammouda,Ola; Atteya,Atteya Mostafa. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allelochemicals; Aqueous extract; Bioherbicide; Phytotoxicity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300014 |
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