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首页> 外文期刊>Plant and Soil >Rhizosphere properties of Poaceae genotypes under P-limiting conditions.
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Rhizosphere properties of Poaceae genotypes under P-limiting conditions.

机译：P限制条件下禾本科基因型的根际性质。

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Plant genotypes differ in P efficiency, i.e. their capacity to grow in soil with low P availability. Plant properties such as root and root hair length, release of P mineralising and mobilizing compounds by the roots and P requirement for optimal growth are known to influence P efficiency. In order to improve the understanding of the role of rhizosphere properties in plant P uptake, we grew three Poaceae genotypes [two wheat (Triticum aestivum L.) genotypes (the P-efficient Goldmark and the P-inefficient Janz), and the Australian native grass Austrostipa densiflora L.] to maturity in an acidic loamy sand with low P availability. Addition of 120 mg P as FePO4 kg-1 (P120) improved the growth of all three genotypes. In both P0 and P120, growth and P uptake were smaller in Janz than in Goldmark. During the vegetative phase, growth and P uptake of Austrostipa were smaller than in Goldmark in P0 but greater in P120. These differences can be explained by plant properties such as root growth, specific P uptake, mobilization of inorganic and organic P by root exudates and P utilisation efficiency. In P120, P availability in the rhizosphere was least in Janz and greatest in Austrostipa. Microbial biomass P in the rhizosphere was least in Janz. Acid phosphatase activity was greatest in the rhizosphere of Austrostipa and least in Janz. Plant growth and P uptake were positively correlated with microbial P, acid phosphatase activity and resin P in the rhizosphere, suggesting that microorganisms contribute to uptake of P by plants in this soil. Microbial community composition in the rhizosphere [analysed by fatty acid methylester (FAME) analysis and denaturing gradient gel electrophoresis (DGGE)] differed among genotypes, changed during plant development and was affected by P addition to the soil. Genotype-specific microbial community composition in the rhizosphere may have contributed to the observed differential capacity of plants to grow at low P availability..
机译：植物基因型的磷效率不同，即它们在低磷有效性土壤中的生长能力。已知植物特性（例如根和根毛长度），根部释放的P矿化和动员化合物以及最佳生长所需的P需求会影响P效率。为了更好地了解根际特性在植物吸收磷中的作用，我们种植了三种禾本科基因型（两种小麦（Triticum aestivum L.）基因型（P型高效金标和P型低效Janz），以及澳大利亚原住民草在低磷可用性的酸性壤质沙土中成熟。添加120 mg P作为FePO4 kg-1（P120）可以改善所有三种基因型的生长。在P0和P120中，Janz的生长和P吸收均小于Goldmark。在营养阶段，P0的Austrostipa的生长和P吸收小于Goldmark，而P120的则更大。这些差异可以通过植物的特性来解释，例如根系生长，特定的P吸收，根系分泌物对无机P和有机P的迁移以及P的利用效率。在P120中，根际中磷的有效性在Janz中最少，在Austrostipa中最大。根际的微生物量P最少。酸性磷酸酶活性在Austrostipa的根际中最大，而在Janz中则最小。根际中植物的生长和磷的吸收与微生物磷，酸性磷酸酶活性和树脂P呈正相关，这表明微生物有助于土壤中植物对磷的吸收。根际中的微生物群落组成[通过脂肪酸甲酯（FAME）分析和变性梯度凝胶电泳（DGGE）分析]在基因型之间有所不同，在植物发育过程中发生了变化，并受到土壤中磷的添加的影响。根际中特定于基因型的微生物群落组成可能导致观察到的植物在低磷条件下生长的差异能力。

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