A study of the allelopathic effect of extracts from different parts of Iva xanthiifolia on five Brassicaceae species

doi:10.11686/cyxb2017398

Abstract

Abstract: This study investigated the allelopathic effect of extracts of Iva xanthiifolia root and stem tissues on Raphanus sativus, Brassica campestris, Brassica pekinensis, Brassica juncea, and Brassica oleracea. In this study, the effects of different concentrations (10, 20, 30, 40 g·L^-1) aqueous extract on the germination and seedling growth of the above 5 Brassicaceae species were studied indoors to elucidate allelopathic effects of I. xanthiifolia on these crops indoors. Significant (P<0.05) allelopathic effects on the germination rate, germination potential, germination index, vigor index, root length, seedling height and fresh weight were found, and some differences in response among the five tested brassica species. A notable feature of the results were that growth promoted effects on seed germination and growth of R. sativus, B. pekinensis and B. campestris at the lowest treatment rate of 10 g·L^-1 I. xanthiifolia extract and inhibitory effects at higher rates, while B. juncea and B. oleracea were inhibited even at the lowest treatment rates. Stem extract of I. xanthiifolia was more potent than root extract, which indicated that the aqueous extract of the stem contained the main allelochemicals with inhibitory effects on seed germination and seedling growth. The results of this comprehensive allelopathy index evaluation, demonstrated that aqueous extracts of I. xanthiifolia exert a strong inhibitory effect on seedling growth of the five Brassicaceae species tested.

Key words: Iva xanthiifolia, aqueous extract, allelopathy, seed germination, seedling growth

YAO Shu-kuan, LI Feng-lan, PENG Li-na, FENG Xu, DONG Jia-min, FENG Zhe, ZHANG Jun-feng, ZHAO Qiao-qin, FENG Shan-shan, XU Yong-qing, HU Bao-zhong. A study of the allelopathic effect of extracts from different parts of Iva xanthiifolia on five Brassicaceae species[J]. Acta Prataculturae Sinica, 2018, 27(9): 56-66.

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