Differential allelopathic potential of wild rice (Oryza rufipogon W. Griffith) biotypes Song Yuanyuan, Wang Ruilong*, Zhao Meiyu, Yan Xinxin, Su Yijuan, Zeng Rensen State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou510642, China Key Laboratory of Tropical Agro-environment, Ministry of Agriculture, South China Agricultural University, Guangzhou510642, China Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou510642, China. *Correspondence author: E-Mail: yyuansong@163.com, rlw2009@scau.edu.cn
Online published on 7 November, 2012. Abstract Ten biotypes of Gaozhou (Guangdong, China) common wild rice (Oryza rufipogon W. Griffith) were bioassayed to evaluate their allelopathic potential against seedling growth of barnyardgrass (Echinochloa crus-galli L.). Aqueous stem leachates of Gaozhou 2 inhibited the root growth of barnyardgrass by 70.6%. HPLC analyses showed the presence of several phenolic acids but none of them was significantly correlated with the phytotoxicity. Aqueous leachates of Gaozhou 2 leaf residues after 7–day-decomposition had the strongest inhibition against root growth of barnyardgrass. The phytotoxicity of residue leachates was highest when prepared at low temp (14°C). Aqueous leachates of leaf residues decomposed in different water content had variable inhibitory effect on the seedling growth of barnyardgrass. Top Keywords Allelopathy, rice, residue leachates, barnyardgrass, temperature. Top |