Comparison of rhizosphere impacts of two wheat genotypes differing in phosphorus utilization efficiency
文献类型: 外文期刊
作者: Yan, Haili;Liu, Xuan;Li, Guihua;Zhang, Shuxiang;Liu, Wenke
作者机构:
关键词: enzyme activity;rhizosphere soil;fertizer utilization efficiency;rhizosphere activation
期刊名称: CANADIAN JOURNAL OF PLANT SCIENCE
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收录情况: SCI
摘要: Yan, H., Liu, W., Liu, X., Li, G. and Zhang, S. 2010. Comparison of rhizosphere impacts of two wheat genotypes differing in phosphorus utilization efficiency. Can. J. Plant Sci. 90: 311-317. Exploitation of high phosphorus (P) use efficiency genotypes of crops and understanding their rhizosphere P activation mechanisms is essential to development of beneficial management practices for sustainable agricultural production. A pot experiment was carried out to investigate the differences in changes of pH, phosphatase activity, and water-soluble P in the rhizosphere soil and crop growth and P content of two constrasting wheat genotypes (P-efficient, Xiaoyan54, and P-inefficient, Jing411) in a calcareous soil supplied with three rates (0, 50, and 100 mg kg(-1) soil, which are coded as P-0, P-50 and P-100, respectively) of fertilizer P. Results showed that root biomass, root/shoot ratio and efficiency index of Xiaoyan54 were significantly higher than those of Jing411 at the same P level. In addition, the roots of Xiaoyan 54 absorbed significantly more P than the roots of Jing 411, except for the P-50. The dry weight of shoot biomass was similar between the two wheat genotypes. Wheat biomass and P content in shoot, root and the total for both genotypes increased for P supplied treatments, compared with those without P supply. The rhizosphere acidification capacity of Xiaoyan54 was greater than Jing411 without P addition. However, Xiaoyan54 acidified rhizosphere soil at a larger distance than Jing411 at high P fertilization. The phosphatase activity did not differ between the two genotypes, regardless of the location in the rhizosphere. Soil applied with high P decreased the phosphatase activity for the root surface soil only. Water-soluble P concentration in rhizosphere and the bulk soil were similar for Xiaoyan54 and Jing411, and increased as increasing P levels. Xiaoyan54's large root biomass and strong acidification ability might be the main mechanisms contributing to high P uptake under P-deficient conditions.
分类号: Q94
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