Effects of Allelochemicals of Some Eucalyptus Species on Germination and Radicle Growth of <i>Arachis Hypogea</i>

Abstract

A laboratory experiment was conducted to assess the effects of allelochemicals of Eucalyptus camaldulensis, Eucalyptus citriodora and Eucalyptus globules on germination and root elongation using leguminous crop ground nut ( Arachis hypogea) as bioassay material. The experiments were conducted in sterilized petridishes. The effect of different concentration of aqueous extracts was compared with distilled water (control). The result revealed that different concentrations of E. globulus and E. camaldulensis extracts caused highly significant (p=0.05) inhibitory effect on germination and root elongation. The bioassays indicated that the inhibitory effect was proportional to the concentrations of the extracts so that higher concentration has a stronger inhibitory effect. The study also revealed that inhibitory effect was much pronounced in root development rather than seed germination.

Allelopathy and Sowing Depth Effects on Agropyron Desertorum and Onobrychis Sativa

“…. Changes in DNA synthesis, mitochondrial metabolism, and cell mitotic indices contribute to the inhibition of root growth and development, consistent with ndings byLawan et al, (2011). The higher sensitivity of roots to allelochemicals compared to aerial parts of seedlings has been reported in various studies(Bughio et al, 2013;Das & Bandyopadhyay, 2011;Ercoli et al, 2007;Florence, 1986;Jafari et al, 2004).…”

Reducing Herbicide Dependency: Impact of Murraya koenigii Leaf Extract on Weed Control and Growth of Wheat (Triticum aestivum) and Chickpea (Cicer arietinum)

“…Although the allelochemicals were shown either to be stimulatory or inhibitory in the first tranche of experiments, i.e., Petri plate experiments (PPEs), the results revealed that higher concentrations (6%, 8%, and 10%) of aqueous extracts significantly inhibited the germination of both crops, i.e., C. arietinum and T. aestivum. Lawan et al [33], Vashishth et al [34] and Khattak et al [35] have also reported similar findings. The allelochemicals found in aqueous extracts of Jatropha curcas were found to be stimulatory to wheat at lower concentrations, while at higher concentrations, the extracts were either inhibitory or did not affect wheat plant growth compared with the control.…”

Extracto acuoso de Eucalyptus globulus Labill. en la germinación y desarrollo de cultivos andinos: un estudio de alelopatía en Cusco, Perú

“…En contraste, Murillo et al (2005), registran que los extractos hexánicos de E. globulus tiene un efecto alelopático negativo sobre el crecimiento de la soya, el tomate y la lechuga. Lawan et al (2011) registraron el potencial negativo del eucalipto afectando la longitud radicular de Arachis hypogaea L. hasta en un 50.4% con extractos acuosos (45 g/L) durante 120 horas. Los bioensayos desarrollados en Cusco en concentraciones de 10, 25, 50, 100 y 1,000 mg/L, son coincidentes con Castro-Moreno y Chong-Rodríguez (2015) y difieren de los resultados obtenidos por Murillo et al (2005) y Lawan et al (2011), aun cuando en Cusco se trabajó con concentraciones menores, pero, durante un tiempo mayor.…”

“…Lawan et al (2011) registraron el potencial negativo del eucalipto afectando la longitud radicular de Arachis hypogaea L. hasta en un 50.4% con extractos acuosos (45 g/L) durante 120 horas. Los bioensayos desarrollados en Cusco en concentraciones de 10, 25, 50, 100 y 1,000 mg/L, son coincidentes con Castro-Moreno y Chong-Rodríguez (2015) y difieren de los resultados obtenidos por Murillo et al (2005) y Lawan et al (2011), aun cuando en Cusco se trabajó con concentraciones menores, pero, durante un tiempo mayor. Ballester et al (1982), realizaron cuatro ensayos utilizando extractos de hojas de eucalipto y acículas de pino, para determinar los efectos alelopáticos en la germinación de semillas de Trifolium repens L., Trifolium pratense L., Di chondra repens J.R. Forst.…”