Allelopathy Journal

  • Year: 2012
  • Volume: 30
  • Issue: 2

Differential allelopathic potential of wild rice (Oryza rufipogon W. Griffith) biotypes

  • Author:
  • Yuanyuan Song, Ruilong Wang, Meiyu Zhao, Xinxin Yan, Yijuan Su, Rensen Zeng
  • Total Page Count: 8
  • DOI:
  • Page Number: 189 to 196

State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou510642, ChinaKey Laboratory of Tropical Agro-environment, Ministry of Agriculture, South China Agricultural University, Guangzhou510642, ChinaKey Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou510642, China.

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.

Keywords

Allelopathy, rice, residue leachates, barnyardgrass, temperature