Laboratory bioassays demonstrate variable germination effects of Iva xanthiifolia in multiple plant species, indicating possible agricultural implications.
In laboratory bioassays, we evaluated the effects of Iva xanthiifolia leaf aqueous extract concentrations on the germination and seedling growth of Raphanus sativus, Brassica campestris, B. pekinensis, B. juncea and B. oleracea. With GC-MS we analyzed the chemical component of I. xanthiifolia leaf aqueous extract and studied their allelopathic effects on test plants. The I. xanthiifolia leaf aqueous extract promoted and inhibited the seed germination and seedling growth of R. sativus, B. juncea and B. campestris, exhibiting the hermetic effects. Whereas extracts suppressed the seed germination and seedling growth of B. juncea and B. oleracea. The main allelochemical in I. xanthiifolia extract was found in the neutral component. The inhibition was greatest in B. juncea and B. oleracea but less in R. sativus, indicating the variability in the allelopathic effects of I. xanthiifolia. Ethyl acetate was used for the extraction of I. xanthiifolia leaf aqueous extract for GC-MC analysis, which identified 70-compounds, consisting mainly of allelochemicals (2-camphor, borneol, isovanillin, 2-methylallyl phenol, dibutyl phthalate, 1-caryophyllene and ambrosin).
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Yao et al. (2018) studied this question.
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