Allelopathic effects of velvetleaf volatile oil on germination and seedling growth of wheat, maize, and soybean

doi:10.13287/j.1001-9332.202007.030

Abstract

Abstract: Velvetleaf (Abutilon theophrasti) is a common weed in dryland, which can reduce crop yield. Allelopathy is one of the possible reasons resulting in crop yield reduction. In this study, we analyzed the allelopathic effect of velvetleaf volatile oil components on germination and seedling growth of three dryland crops, wheat (Triticum aestivum), maize (Zea mays), and soybean (Glycine max). A total of 26 compounds in velvetleaf volatile oil were identified by GC-MS, accounting for 98.1% of the total chromatographic peak areas. The terpenes with lower molecular weight in the volatile oil were α-pinene, eucalyptol, α-terpinolene, β-terpinene, trans-α-ionone, and trans-β-ionone. The saturated aqueous solution of velvetleaf volatile oil could inhibit seed germination of three crops by filter paper and soil. Velvetleaf volatile oil could inhibit the seedling growth of three crops through air, filter paper, and soil. Wheat was the most susceptible to volatile oil, followed by maize and soybean. The inhibitory effect of volatile oil on the growth of wheat was the strongest in air medium, followed by filter paper and soil medium. The lower molecular weight of terpene components from volatile oil might be the important allelochemicals.

Key words: velvetleaf, volatile oil, wheat, maize, soybean, allelopathy

LI Chun-ying, TIAN Yao, YU Mei-ting, ZHAO Chun-jian. Allelopathic effects of velvetleaf volatile oil on germination and seedling growth of wheat, maize, and soybean[J]. Chinese Journal of Applied Ecology, 2020, 31(7): 2251-2256.

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