Allelopathic Effect of Aqueous Extract of Argemone mexicana L on Germination and Growth of Brachiaria dictyoneura L and Clitoria ternatea L

Abstract

The present study was conducted in the laboratory to investigate the allelopathic effect of Mexican poppy (Argemone mexicana L.) to the germination and growth parameters of two native species Brachiaria dictyoneura L and Clitoria ternatea L. Different concentrations of leaf and seed aqueous extracts from Argemone mexicana (0%, 25%, 50%, 75% and 100%) were evaluated. Results showed that seed germination, root length, shoot length, seedling length, fresh weight and dry weight of B. dictyoneura and C. ternatea seedlings were significantly reduced by leaf and seed extracts compared with control treatments. Roots were more affected than shoots; and leaf extract was more suppressive than seed extracts. From the results, it is concluded that leaf and seed extracts have some allelochemicals with inhibitory effect on germination and growth of the tested plant species.

Evaluation of the Allelopathic Effect of Aqueous Extract of <i>Zygophyllum simplex</i> L. on <i>Vicia faba</i> L. Plants

“…All treatments applied recorded low values in relation to the control (Table 1). This trend of negative effects of plant extract was previously reported by many authors (Haroun 2010, Haroun and Al Shehri 2001, Hassan et al 2013. All revealed that the tested plant extracts have inhibitory effects on mitotic division, especially at high concentrations.…”

“…To some extent this indicates the toxic effect level on Vicia faba at this concentration. A number of previous studies support this hypothesis (Siddiqui et al 2002, Laosinwattana et al 2009, Siddiqui 2007, Han et al 2008, Haroun and Al Shehri 2001, Hassan et al 2013, Teerarak et al 2010, Batish et al 2006.…”

“…This reduction could be due to inhibition of DNA synthesis or blocking in the G2 phase of the cell cycle, preventing the cycle from entering mitosis (Haroun 2010, Haroun and Al Shehri 2001, Schulze and Kirschner 1986. In detailed studies, Rice (1984) and Hassan et al (2013) revealed that allochemicals in plant extract interrupted the mitotic activity of young cells resulting in inhibition of germination and plant growth.…”

Allelopathic activity of Nepeta nuda L. subsp. nuda water extracts

“…According to [35] the permeability of allelochemicals to root is greater than to shoot. Obviously, the root length reduction is a better indicator of allelopathic effect than shoot growth [36].…”

Functional Traits Plasticity of the Invasive Herb Argemone ochroleuca Sweet in Different Arid Habitats

“…The spread of A. ochroleuca has been ascribed to disturbance, overgrazing, and invasive competency [ 32 , 34 ]. The Mexican poppy has been reported to possess allelopathic activity which enables it to invade and dominate new habitats [ 33 , 35 ].…”