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[目的]研究低磷胁迫下不同磷效率基因型大豆花期的磷营养效率。[方法]选用4个“磷低效”大豆基因型(D03、D05、D17和D18)和4个“磷高效”大豆基因型(D31、D34、D37和D38)为试验材料,采用土培试验,设高磷(+P)和低磷(-P)2个处理,分析不同磷效率大豆基因型的含磷量、吸磷量和磷的利用效率与磷效率的关系。[结果]低磷处理下,4个磷高效基因型大豆苗期植株吸磷量的优势均较明显,D34表现出较强的磷吸收能力,但其磷利用效率的适应性并未表现出优势,只有D37表现出较强的磷利用能力和吸磷能力。相关与通径分析表明,在大豆花期(-P)和(+P)处理下,大豆磷效率的高低主要是由吸磷能力的强弱来决定的,(-P)处理明显大于(+P)处理。(-P)和(+P)处理的吸磷量和磷的利用效率对磷效率直接影响均较大,而吸磷量贡献更大;间接影响均较小。低磷胁迫下,在大豆的营养生长阶段花期,磷高效基因型适应低磷的机理是不同的,磷吸收效率即吸磷量是不同基因型大豆花期磷效率的主要变异来源。[结论]该研究明确了不同磷效率基因型大豆的磷吸收效率和磷利用效率对磷效率的贡献。
[Objective] The research aimed to study the phosphorus nutrition efficiency of soybean with different P efficiency genotypes under phosphorus deficiency stress. [Method] With 4 “P inefficient” soybean genotypes (D03, D05, D17 and D18) and 4 “Phosphorus - efficient” soybean genotypes (D31, D34, D37 and D38) The soil P was used to determine the phosphorus uptake, phosphorus uptake, phosphorus use efficiency and phosphorus efficiency of two soybean cultivars with different phosphorus efficiency (S) genotypes, including high P (P) and low P (P) treatments. [Result] The results showed that the phosphorus uptake efficiency of four phosphorus-efficient soybean genotypes at seedling stage was significantly lower under low-phosphorus treatment, while D34 showed stronger ability of phosphorus uptake, but its adaptability to phosphorus use efficiency did not show any advantage , Only D37 showed strong ability of phosphorus utilization and phosphorus uptake. Correlation and path analysis showed that under the treatment of soybean (-P) and (+ P), the phosphorus efficiency of soybean was mainly determined by the ability of phosphorus uptake, (- P) treatment was significantly greater than (+ P )deal with. (-P) and (+ P), the phosphorus uptake efficiency and phosphorus utilization efficiency had a direct impact on the phosphorus efficiency, while the phosphorus uptake contributed more; the indirect effects were small. Under low-P stress, the mechanism of phosphorus-efficient genotypes adapting to low-P was different during the vegetative growth phase of soybean, and the phosphorus uptake efficiency, that is, the amount of uptake of phosphorus, was the main source of variation in phosphorus efficiency in different soybean genotypes. [Conclusion] The study clarified the contribution of phosphorus uptake efficiency and phosphorus use efficiency to phosphorus efficiency of soybean with different P efficiency genotypes.