Allelopathic effect of black mustard (Brassica nigra L.) on germination and growth of wild oat (Avena fatua L.)

Allelopathic effect of ginger on seed germination and seedling growth of soybean and chive

“…Stem extracts exhibited the greatest inhibition at all concentrations, while rhizome extracts was the least inhibitory. The results found in this study are inconsistent with those of Turk and Tawaha (2003), who reported that leaf extracts of black mustard (Brassica nigra L.) exhibited the greatest inhibition, while stem extracts were the least inhibitory ns: not significant; (*) and (**) represent significant difference over control at P < 0.05 and P < 0.01, respectively. (the test species is wild oat (Avena fatua L.)).…”

“…Water uptake of two test species was significantly inhibited with increasing extract concentration (Tables 3 and 4), which was similar to results of Turk and Tawaha (2003) who reported that increasing the concentration of black mustard aqueous leaf extracts significantly inhibited the water uptake of germinating wild oat seeds. There may be an indirect association between lower seed germination and allelopathic inhibition of water uptake and lipase activity.…”

“…There may be an indirect association between lower lipase activity and allelopathic inhibition of water uptake. To a large extent, lipase activity is primarily related to water uptake by the seeds (Turk and Tawaha, 2003). Lipase activity of soybean seed was significantly higher than that of chive seed under the same aqueous extract concentration (Tables 5 and 6).…”

“…At 4-h intervals, seeds were taken from the solution, blotted for 3 h between two folds of filter paper, and weighed (W 2 , the final seed weight). This is based on the method given by Turk and Tawaha (2003). Water uptake percentage is expressed as follows:…”

Allelopathic suppression by Conyza canadensis depends on the interaction between latitude and the degree of the plant’s invasion

“…At present, the invasive plant species C. canadensis has spread into most regions of China (Weber et al 2008;Hao et al 2011;Yan et al 2014). Seed germination and growth are highly important for plant recruitment and resource competition (Weiner et al 1997;Turk & Tawaha 2003). Th e allelopathic eff ects of invasive plant species can decrease the competitiveness of co-occurring species.…”