Abstract:
Iris pallida Lam., also known as Sweetie Iris, is a perennial ornamental and medicinal plant
that produces a wide range of secondary metabolites. The Sweetie Iris was recently reported to have
high allelopathic properties with the potential to be explored in sustainable weed management. This
study aimed to identify and evaluate the contributions of compounds involved in the inhibitory
effects of the rhizome of Sweetie Iris. High-performance liquid chromatography (HPLC) analysis
was used to determine the content of β-ionone in the rhizome of Sweetie Iris. The phytotoxicity of
β-ionone was evaluated on lettuce (Lactuca sativa L.) and other test plants. The content of β-ionone
The crude extract of Sweetie Iris rhizome was found to be 20.0 mg g1 by HPLC analysis. The
phytotoxicity bioassay showed that β-ionone had strong inhibitory activity on the growth of lettuce
(Lactuca sativa L.) and the other test plants, including Taraxacum officinale, Stellaria media, Eleusine indica,
Amaranthus hybridus, Vicia villosa, and Brassica napus. At a concentration of 23.0 µg mL−1,
, β-ionone
inhibited the growth of all test plant species treated. Therefore, β-ionone is an active compound
among the other allelopathic substances contained in the rhizome of Sweetie Iris.
