Abstract
Cuscuta campestris Yuncker, commonly known as Golden dodder is an annual problematic parasitic weed in abandoned and derelict areas in Malaysia. The weed is leafless plant, glabrous, yellow-white in colour, with haustoria, sucker-like attachments to the aerial parts of a wide range of host plants. This study was instituted to assess the allelopathic potentials of C. campestris on lettuce and radish as test plants. Three types of treatment using aqueous extract of fresh (fc), and dried s (dc) and ethanol extract of dried C. campestris (ec) were assayed for their allelopathic effects on radish (Raphanus sativus) and lettuce (Lactuca sativa) seeds. These extracts reduced seed germination, root and shoot lengths of both radish and lettuce. The roots of radish were more sensitive vis-à-vis the shoots when exposed to fc, while shoots were more sensitive than roots when exposed to dc. Dose-mediated differences in shoot and root lengths of radish were registered when treated with ec. The roots of lettuce were more sensitive compared with the shoots when exposed to ec, while no measurable effect was observed when roots and shoots of lettuce were exposed to fc and dc. The results demonstrated the allelopathic effects of dodder on the tested host plants. The potentials of these extracts and their chemical constituents as bioactive ingredients for new herbicides are implied.
Highlights
The term “allelopathy” was first coined by Molisch (1937)
Allelopathy evolution resulting from changes in the plant environment factors such as competition for oxygen, sources of nutrients, space and light has led to the production of secondary metabolites that serve as allelopathy (Inderjit et al, 2011)
The principal objective of this study was to assess the allelopathic potentials of water aqueous extracts of fresh and dried C. campestris, and the ethanol extract of dried C. campestris on seed germination and growth of radish (Raphanus sativus L.) and lettuce (Lactuca sativa L.) seedlings
Summary
The term “allelopathy” was first coined by Molisch (1937). Allelopathy involves the release of bioactive compounds or chemicals into the environment by plants or organisms, and their ensuing biochemical activities may affect the growth of other plant species or organism presence in the immediate environment (Rice, 1974 & 1984), or impacting predators, fungi or bacteria from growing in the area (Putnam, 1988; Rice, 1974). Tesio and Ferrero (2010) showed that allelopathic activity was present in the annual and seasonal weeds, having an impact on agricultural crops especially giving effect by inhibiting the growth and proliferation of plants. Tesio and Ferrero (2010) showed that allelopathic activity was present in the annual and seasonal weeds, having an impact on agricultural crops especially giving effect by inhibiting the growth and proliferation of plants. Allelopathy serves as secondary metabolites, which result from the adaptation process of plants in relation to the hosts. Leslie and Stephen (2003) defined that these activities involved chemical mechanisms The presence of this mechanism is evident that internal activity plays a role in the protection of weedy plants
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