Journal
MOLECULES
Volume 23, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/molecules23102506
Keywords
Costus; allelochemicals; chemical basis; antioxidase system; replant problems
Funding
- National Key Research and Development Program of China [2017YFD0200804-05]
- National Natural Science Foundation of China [31570354, 21775154, 31772668, 21302195, 31560037]
- CAS Light of West China Program
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Allelochemicals are the media of allelopathy and form the chemical bases of plant-environment interactions. To determine true allelochemicals and their autotoxic effects, seven compounds were isolated and identified from in-situ sampled rhizosphere soil of cultivated Saussurea lappa. Of these; costunolide (2), dehydrocostus lactone (3) and scopoletin (4) showed significant inhibition on seedling growth in a concentration-dependent manner. Detection and observation demonstrated that the antioxidase system was found to be affected by these chemicals, resulting in the accumulation of ROS and membrane damage. To investigate their release ways, the compounds were traced back and volumes quantified in rhizosphere soil and plant tissues. This work made clear the chemical bases and their physiological effects on the plants. These chemicals were found to be the secondary metabolites of the plants and included in the rhizosphere soil. The findings identified a potential pathway of plant-plant interactions, which provided theoretical basis to overcoming replanting problems. This research was also useful for exploring ecological effects of allelochemicals in green agriculture.
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