Allelopathic effects of some Lamiaceae on seed germination and seedling growth of dodder (Cuscuta campestris Yunck.)

Abstract

Dodder (Cuscuta campestris Yunck.) is one of the parasitic weeds that cause yield losses of many crops and orchards. Control of this weed is very difficult. This experiment was carried out to assay the effects of different concentrations [0 (distilled water as a control), 1.25%, 2.5%, and 5% (gram powder of plant per 100 ml of distilled water)] of lavender (Lavandula vera DC.), rosemary (Rosmarinus officinalis L.), garden sage (Salvia officinalis L.), thyme (Thymus vulgaris L.), and common balm (Melisa officinalis L.) on dodder seed germination and seedling growth. Results showed that all of these medicinal plants had significantly effect on dodder seed germination and seedling growth. So that the highest concentration of lavender, thyme, garden sage, common balm, and rosemary, respectively; dodder seed germination was reduced 58.25%, 25.25%, 25%, 23. 5%, and 11.25%, respectively. Seedling growth of dodder was more sensitive than that of germination against extract concentration of all medicinal plant. The present study shows that the inhibitory effect of lavender aqueous extract on germination and seedling growth of dodder was more than that of other medicinal plant tested in this experiment. These results showed inhibitory effects of these medicinal plants extract on dodder seed germination and seedling growth.

Herbicidal effects of Datura stramonium (L.) leaf extracts on Amaranthus hybridus (L.) and Tagetes minuta (L.)

“…The results showed a reduced germination percentage with increasing concentration of allelochemicals from D.stramonium across all the measured weeds. These results concur with the findings of many authors (Hassannejad and Ghafarbi, 2013;Yu et al, 2003;Elisante et al, 2013;Oyun, 2006;Alam and Islam, 2002). D. stramonium allelochemicals contains chemicals that retard the metabolism of food reserves in the seed (Levit et al, 1984) and the secondary effects of these processes include reduced germination and early growth of radicles (Levitt and Lovetti, 1984).…”

Impact of Biological Agents and Plant Essential Oils on Growth, Quality and Productivity of Cabbage and Cauliflower Plants Correlated to Some Diseases Control

“…These results may be due to the superior effect of both eucalyptus oil and Trichoderma harzianum, which has resulted in increased cabbage and cauliflower vegetative growth characteristics (Table 2 and 3). These results agree with those of Niakan and Saberi (2009), also Cumagun (2012), Rehman et al (2012), and Hassannejad & Ghafarbi (2013).…”

“…These results agree with those of Niakan and Saberi (2009) on phalaris weed who stated that eucalyptus increased root and shoot length. Also, Hassannejad and Ghafarbi (2013) revealed that eucalyptus caused increases in seed germination. Also, Rehman et al (2012) stated that Trichoderma treatments increased seed germination and improved plant growth vigor on cauliflower.…”

Thorn apple (Datura stramonium L.) allelopathy on cowpeas (Vigna unguiculata L.) and wheat (Triticum aestivum L.) in Zimbabwe

“…This shows that water is necessary for germination to take place; it triggers biochemical reactions. Seed germination on all tested species might have been inhibited by the presence of aqueous thorn apple extracts; these results were in line with those by Hassannejad and Ghafarbi (2013). This could be attributed to reduced water uptake by the seeds in the presence of allelochemicals found in thorn apple (ELshora et al, 2015a).…”