Abstract
Allelopathy is described as both beneficial and deleterious biochemical interaction between plant and weeds, and/or plant and microorganisms through the production of chemical compounds that escape into the environment and subsequently influence the growth and development of neighbouring plants. The present laboratory experimental study was conducted to evaluate the allelopathic effect of Cassia sophera (L.) on three weed plants (Chenopodium album L., Melilotus alba Medik and Nicotiana plumbaginifolia Viv.). Aqueous extracts of Cassia at 0.5, 1.0, 2.0 and 4.0% concentrations were applied to determine their effect on seed germination, seedling growth, dry biomass, leaf area, relative water content, chlorophyll and protein content of test plants under laboratory conditions. The aqueous extracts had a significant retardatory effect on seed germination of test plants which varied among species and also with the different concentrations used. Root length and shoot length of weed species decreased significantly when plants were exposed to increasing aqueous concentration (0.5, 1, 2 and 4%). The noticed reduction in dry biomass, leaf area and relative water content were also significant. Physiological parameters (total chlorophyll content and protein content) in relation to three test species (M. alba, C. album and N. plumbaginifolia) were significantly reduced with the different concentrations of aqueous extract used. From this we can predict that cassia might possess allelochemicals that causes the suppressive ability. Key words: Allelopathy, aqueous extract, Melilotus alba, Chenopodium alba and Nicotiana plumbaginifolia.
Highlights
Weeds have been a persistant problem for agriculture systems because it causes economic losses by reduction in crop yield, increase cost of crop production, and often cause total crop failure (Bhuler et al, 1998)
The present laboratory experimental study was conducted to evaluate the allelopathic effect of Cassia sophera (L.) on three weed plants (Chenopodium album L., Melilotus alba Medik and Nicotiana plumbaginifolia Viv.)
Aqueous extracts of Cassia at 0.5, 1.0, 2.0 and 4.0% concentrations were applied to determine their effect on seed germination, seedling growth, dry biomass, leaf area, relative water content, chlorophyll and protein content of test plants under laboratory conditions
Summary
Weeds have been a persistant problem for agriculture systems because it causes economic losses by reduction in crop yield, increase cost of crop production, and often cause total crop failure (Bhuler et al, 1998). Concerns about negative effects of herbicide use, such as environmental contamination, development of herbicide resistant weeds and human health problems, make it necessary to diversify or other weed management options (Holethi et al, 2008). The use of allelopathic behavior is one of the new options for sustainable weed management (Olofsdotter and Navarez, 1996). The invasive nature of weeds is due to the allelopathy which can be defined as the direct or indirect harmful or beneficial effects of one plant on another through the production of chemical compounds that escape into the environment.
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