Bao, L.; Zhao, X.; Kang, G.; Suzuki, K.; Ismail, T.; Fujii, Y.; Motoki, S. Assessment of the Allelopathic Activity of Various Parts of Platycodon (Platycodon grandiflorus) and Its Mitigation by Activated Carbon. Agronomy2024, 14, 385.
Bao, L.; Zhao, X.; Kang, G.; Suzuki, K.; Ismail, T.; Fujii, Y.; Motoki, S. Assessment of the Allelopathic Activity of Various Parts of Platycodon (Platycodon grandiflorus) and Its Mitigation by Activated Carbon. Agronomy 2024, 14, 385.
Bao, L.; Zhao, X.; Kang, G.; Suzuki, K.; Ismail, T.; Fujii, Y.; Motoki, S. Assessment of the Allelopathic Activity of Various Parts of Platycodon (Platycodon grandiflorus) and Its Mitigation by Activated Carbon. Agronomy2024, 14, 385.
Bao, L.; Zhao, X.; Kang, G.; Suzuki, K.; Ismail, T.; Fujii, Y.; Motoki, S. Assessment of the Allelopathic Activity of Various Parts of Platycodon (Platycodon grandiflorus) and Its Mitigation by Activated Carbon. Agronomy 2024, 14, 385.
Abstract
Continuous cropping of Platycodon produces problems that significantly impact its yield and quality making it a pressing issue that requires immediate attention. In this study, the sandwich method is employed to evaluate the allelopathic activity of different plant parts (leaves, stems, and roots) of Platycodon. The inhibitory effects of the various Platycodon plant parts were quantified based on their effects on lettuce seedlings growth by Sandwich method, with the following average inhibition percentages at 1 mg/ml (agar) of : leaves (79.4%, 61.8%), stems (58.0%, 45.7%), and roots (53.4%, 49.3%) for lettuce radicals and hypocotyls, respectively. At a concentration of 5 mg/ml, the inhibitory effects were as follow: leaves (91.9%, 72.2%), stems (79.5%, 60.3%), and roots (71.4%, 65.2%). Also, by employing the Plant Box method, it was determined that Platycodon root exudation. The growth inhibition rates of lettuce seedling roots and hypocotyls were 45.5% and 18.9%, respectively. The effect of activated carbon on the adsorption of allelopathic substances was investigated, and the results of the sandwich method with a concentration of 1 mg/ml showed the following growth inhibitory effects on lettuce seedlings and hypocotyls: roots (27.8%, 25.7%), leaves (13.3%, 25.7%), and stem (9.07%, 13.6%). The Plant Box method revealed average rates of inhibition of -16.7% and -4.70% on the growth of lettuce seedlings and hypocotyls, respectively. The results of this study demonstrated that activated carbon has a mitigating effect on the allelopathic inhibition associated with the different plant parts and root exudation of Platycodon, thus may provide a potential solution for overcoming obstacles associated with continuous cropping of Platycodon.
Keywords
Activated carbon; Platycodon; continuous cropping problem; exudation of allelochemicals
Subject
Biology and Life Sciences, Plant Sciences
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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