Phytotoxic Activity of Alkaloids in the Desert Plant Sophora alopecuroides

• Published in: Toxins Vol. 13; no. 10; p. 706
• Main Authors: Lei, Lijing, Zhao, Yu, Shi, Kai, Liu, Ying, Hu, Yunxia, Shao, Hua
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 06.10.2021; MDPI
• Subjects: Abscisic acid; abscisic acid (ABA); Alfalfa; Alkaloids; Alkaloids - chemistry; Alkaloids - pharmacology; Allelopathy; Amaranthus - drug effects; Antimicrobial agents; Competitiveness; cytokinin (CTK); Desert plants; Ethanol; Flavonoids; Herbicides; indole-3-acetic acid (IAA); Lolium - drug effects; malondialdehyde (MDA); Medicago sativa - drug effects; Phytotoxicity; Seedlings; Seeds; Setaria Plant - drug effects; Sophora - chemistry; Sophora alopecuroides; China; Sophora alopecuroides L; abscisic acid (ABA); allelopathy; cytokinin (CTK); antioxidant defense system; malondialdehyde (MDA); alkaloids; indole-3-acetic acid (IAA)
• ISSN: 2072-6651; 2072-6651
• DOI: 10.3390/toxins13100706

is known to produce relatively large amounts of alkaloids; however, their ecological consequences remain unclear. In this study, we evaluated the allelopathic potential of the main alkaloids, including aloperine, matrine, oxymatrine, oxysophocarpine, sophocarpine, sophoridine, as well as their mixture both in distilled H O and in the soil matrix. Our results revealed that all the alkaloids possessed inhibitory activity on four receiver species, i.e., , , and . The strength of the phytotoxicity of the alkaloids was in the following order: sophocarpine > aloperine > mixture > sophoridine > matrine > oxysophocarpine > oxymatrine (in Petri dish assays), and matrine > mixture > sophocarpine > oxymatrine > oxysophocarpine > sophoridine > aloperine (in pot experiments). In addition, the mixture of the alkaloids was found to significantly increase the IAA content, MDA content and POD activity of seedlings, whereas CTK content, ABA content, SOD activity and CAT activity of seedlings decreased markedly. Our results suggest might produce allelopathic alkaloids to improve its competitiveness and thus facilitate the establishment of its dominance; the potential value of these alkaloids as environmentally friendly herbicides is also discussed.