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Allelopathy Effects of Water Extracts of Wheat Straw on Three Chinese Herbal Medicinal Plants

Authors Peng Xiaobang; Zhang Shuoxin

Journal Acat Agriculturae Boreali-Occidentalis Sinica , OCT 28 2021,:279

DOI 10.1016/j.jep.2021.114351 PubMed 34157324

Abstract The potential allelopathic effect of wheat straw (Triticum aestivum L.) on seed germination, seedling growth and physiology was investigated with three medicinal plants (Platycodon grandiflorum A.DC, Scutellaria baicalensis Georgi and Salvia miltiorrhiza Bge) with different concentrations (0, 0.5%, 1.0%, 2.5%, 5.0%, 10.0%). The results showed that low concentrations (0.5%, 1.0%) of wheat straw aqueous extract stimulated the germination and seedling growth (root length, shoot height, fresh weight) of all receptor plants significantly. With the concentration of the aqueous extract increased, the stimulating effects gradually decreased, and even changed into inhibited. The aqueous leachate of wheat straw exerted different allelopathic effects on physiology of different test medicinal plants. For Platycodon grandiflorum A.DC, there was no significant difference in photosynthesis rate at all tested concentration compared with control. For Scutellaria baicalensis Georgi, the lower concentration of leachates stimulated the net photosynthesis rate, yet the higher concentration decreased the net photosynthesis rate, and all tested concentration had inhibited effects on Salvia miltiorrhiza Bge and decreased its net photosynthesis rate. However, the content of soluble sugar and soluble protein of all tested plants were stimulated by low concentrations (0.5%, 1.0%) of wheat straw aqueous extract. Wheat straw aqueous extract can promote seed germination and seedling growth of the three medicinal plants.

Species covered 丹参 Salvia miltiorrhiza 黄芩 Scutellaria baicalensis 小麦 Triticum aestivum