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A New Bioassay Method for Evaluation Allelopathic Potential of Rice Germplasm



Author(s)

Yongliang Lu, Hong Lu, Kilung Kim, Yiding Sun, Jian Fu and Yiqing Guo

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DOI:10.17265/1934-7391/2016.03.003

Allelopathy was defined in 1996 by IAS (international allelopathy society) as any process involving secondary metabolites produced by plant, algae, bacteria and fungi that influences the growth and development of agricultural and biological systems. Rice allelopathy against weeds was reported since 1989, which offers an integrated weed management with substantially reduced herbicide usage. Application of allelopathic rice cultivars is thought a resources conservation and environmental friendly way of weed bio-control, and could promote the sustainable development of agriculture. Screening or evaluating the allelopathic potential rice variety is the first step. In this paper, a new bioassay method was set up by the allelopathic potential of 9 rice lines on the target weed barnyardgrass (Echinochloa crusgalli), and comparing with bioassay methods such as relay seeding in filter paper (RSF) and relay seeding in agar (RSA). The results indicated that three methods had a same tendency in evaluating the allelopathic potential of rice; there existed a significant difference among different bioassay methods, and an interaction between bioassay methods and rice lines. The method of root exudates (RE) with the highest value and a correlation efficiency of 0.98 was considered as ideal bioassay method for evaluation of allelopathic potential.

Rice, allelopathic potential, bioassay methods, comparison