关键词: 水稻, 基因型, 低磷胁迫, 筛选指标

Abstract: In order to approach the relationships between the allelopathy and the resource competition capability of Amaranthus retroflexus during its invasion to farmland ecosystem, a sand culture experiment with A. retroflexus and Glycine max was conducted to study the biomass accumulation and allocation and the nitrogen content in different organs of the two plants under four levels of nitrogen supply with or without the addition of activated carbon. Under lower nitrogen supply, the allelopathic potential of A. retroflexus increased, and its biomass was mainly allocated to reproduction organs, under higher nitrogen supply, the allelopathic potential of A. retroflexus  decreased, and its biomass was mainly allocated to root and leaf. Under the conditions of poorer nitrogen nutrition, the nitrogen content of G. max was significantly lower when active carbon was added, compared with the control, but the difference became smaller when the nitrogen supply was increasing. These results suggested that the A. retroflexus during its invasion could adjust its allelopathic potential and biomass allocation to adapt different levels of nitrogen nutrition.

Key words: Rice (Oryza sativa), Genotype, Low P stress, Screening criteria