Inhibition Effects of Extracts from 113 Plant Species on the Germination and Growth of Amaranthus retroflexus and Digitaria sanguinlis

doi:10.16409/j.cnki.2095-039x.2021.05.018

Abstract

Abstract: The screening and evaluation of herbicidal activities can provide candidate materials and theoretical basis for the development of new plant-derived herbicides. In this study, seed germination and plate methods were used to evaluate the inhibitory activities of 113 plants extracts against Digitaria sanguinalis and Amaranthus retroflexus. At the test dose of 125 mg DW/mL, extracts of Rheum palmatum, Paeonia suffruticosa, Cimicifuga heracleifolia, Rodix aucklandiae, Eupatorium fortunei, Quercus dentata, Styrax benzoin, Paulownia fortunei, Podocarpus macrophylla, and Asarum forbesii showed excellent inhibitory effect against D. sanguinalis, while extracts of P. suffruticosa, E. fortunei, R. aucklandiae, R. volubilis, and P. macrophylla had effective inhibitory against A. retroflexus. The toxicity test showed that Q. dentata, R. aucklandiae, A. forbesii, P. fortunei, E. fortunei, S. benzoin and C. heracleifolia strongly inhibited root growth of D. sanguinalis with the inhibitory medium concentrations (IC₅₀) of 39.30, 5.93, 13.93, 28.69, 8.72, 19.19, and 15.19 mg DW/mL, respectively, and inhibited the stem growth with the IC₅₀of 48.22, 8.13, 15.28, 42.12, 22.39, 7.78, 23.43, and 12.92 mg DW/mL, respectively. Extracts of R. aucklandiae, P. suffruticosa, P. macrophylla, R. volubilis, E. fortunei, and Spirodela polyrhiza showed strong inhibition of root growth in A. retroflexus with the IC₅₀ values of 2.46, 2.85, 2.59, 1.03, 2.24, and 2.79 mg DW/mL, respectively, and of stem growth with the IC₅₀of 7.05, 31.21, 24.17, 4.52, and 32.72 mg DW/mL, respectively. Thus, extracts of P. suffruticosa, E. fortunei, R. aucklandiae, R. volubilis, and P. macrophylla have efficient herbicidal activities and should be further studied.

Key words: plant extract, herbicidal activity, Amaranthus retroflexus, Digitaria sanguinalis, botanical pesticide

CLC Number:

S476

LI Jingjing, TIAN Ci, WANG Mingsi, LIU Luwei, LI Muyang, MA Shujie, ZHANG Lihui, DONG Jingao. Inhibition Effects of Extracts from 113 Plant Species on the Germination and Growth of Amaranthus retroflexus and Digitaria sanguinlis[J]. Chinese Journal of Biological Control, 2022, 38(2): 374-382.

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