The root mediated allelopathic interference of Eclipta alba infested soil on growth, physiological
parameters and antioxidant enzyme activity was conducted on Arachis hypogaea L. and vigna radiata L. It
was found that rhizosphere soil significantly reduced the germination percentage, seedling growth and
dry biomass depending upon the species sensitivity. The germination inhibition was correlated with
membrane deterioration as proved by a strong electrolyte leakage, increase in malondialdehyde (MDA)
and H2O2 content. The physiological parameters like chlorophyll content, photosynthetic rate (Pn),
intercellular CO2 concentration (Ci), stomatal conductance (Gs), and transpiration (E) also showed
significant reduction in E. alba infested soil and non-significant increase in leaf temperature (Lt) of two
test species. The test seedlings have circumvented the allelochemicals stress, by both significant decrease
and non-significant increase in the antioxidant activities in E. alba infested soil in contrast to control soil.
Rhizosphere soil contained significantly higher amount of water-soluble phenolics as the putative
allelochemicals, which were vanillic acid, benzoic acid, ferulic acid, and p-coumaric acid. The study
concluded that rhizosphere soil exerts an allelopathic influence on peanut and mung bean by releasing
water soluble phenolic acids as putative allelochemicals in soil.
The root mediated allelopathic interference of Eclipta alba infested soil on growth, physiologicalparameters and antioxidant enzyme activity was conducted on Arachis hypogaea L. and vigna radiata L. Itwas found that rhizosphere soil significantly reduced the germination percentage, seedling growth anddry biomass depending upon the species sensitivity. The germination inhibition was correlated withmembrane deterioration as proved by a strong electrolyte leakage, increase in malondialdehyde (MDA)and H2O2 content. The physiological parameters like chlorophyll content, photosynthetic rate (Pn),intercellular CO2 concentration (Ci), stomatal conductance (Gs), and transpiration (E) also showedsignificant reduction in E. alba infested soil and non-significant increase in leaf temperature (Lt) of twotest species. The test seedlings have circumvented the allelochemicals stress, by both significant decreaseand non-significant increase in the antioxidant activities in E. alba infested soil in contrast to control soil.Rhizosphere soil contained significantly higher amount of water-soluble phenolics as the putativeallelochemicals, which were vanillic acid, benzoic acid, ferulic acid, and p-coumaric acid. The studyconcluded that rhizosphere soil exerts an allelopathic influence on peanut and mung bean by releasingwater soluble phenolic acids as putative allelochemicals in soil.
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