Journal
PLANT DIVERSITY
Volume 42, Issue 5, Pages 323-333Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.pld.2020.04.003
Keywords
Panax notoginseng; Continuous cropping obstacle; Allelochemical; Triterpenes; Anthraquinone
Categories
Funding
- Science and Technology Planning Project of Yunnan Province, China [2013FC008]
- Major Science and Technique Program of Yunnan Province, China [2016ZF001-001]
- Yung-Chi Cheng academician workstation of Yunnan provincial academy of science and technology [2015IC017]
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Panax notoginseng (Araliaceae) is an important ginseng herb with various health benefits and a history of cultivation in southwestern China over 400 years. In recent years P. notoginseng has faced serious continuous-cropping obstacles due to its large-scale cultivation. In this study, we aim to explore the allelochemicals of P. notoginseng and their interactions with various plants and rhizosphere microorganisms. The chemical constituents of the soil cultivated with 3-year-old P. notoginseng were studied by column chromatography, spectroscopic and GC-MS analyses. We identified 13 volatile components and isolated six triterpenes (1-4, 6-7) and one anthraquinone (5). Compounds 1-7 were tested for their effects on seed germination and root elongation in P. notoginseng, corn, wheat, turnip, water spinach and Arabidopsis thaliana. We also examined the effect of compounds 1-7 on the growth of ten rhizosphere microorganisms of P. notoginseng. At a concentration of 1.0 mu g mL(-1), compounds 3 and 5-7 caused the death of P. notoginseng root cells and compounds 2, 6 and 7 induced the death of root cells of A. thaliana. Compounds 1-5 and 7 inhibited elongation of A. thaliana root tip cells at a concentration of 10.0 mu g mL(-1). Moreover, at a concentration of 0.1 mg mL(-1), compounds 3, 4, 6 and 7 inhibited the growth of probiotics and promoted the growth of pathogens of P. notoginseng. These results suggest that these isolated ursane-type triterpenoid acids and anthraquinone are potential allelochemicals that contribute to continuous-cropping obstacles of P. notoginseng. Copyright (C) 2020 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
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