选取4个典型耐低磷水稻基因型99011、508、580和99112，并以2个磷敏感基因型99012和99056为参照，采用营养液培养和砂培的方法，研究不同磷处理对秧苗生长的影响以及不同耐低磷基因型对3种难溶性磷源(有机磷、铝磷和磷矿粉)吸收利用能力的差异。结果表明，不同无机磷处理，6个基因型生物量和根干重基本上均为全磷处理（P）>对照+铝磷（CK+Al-P）>对照+磷矿粉（CK+RP）> 对照（CK）；4个耐低磷基因型根干重和根冠比均大于2个磷敏感基因型；对于根冠比，耐低磷基因型580和99011为对照+磷矿粉（CK+RP）>对照+铝磷（CK+Al-P）> 对照（CK）> 全磷处理（P），耐低磷基因型508、99112和磷敏感基因型99012为CK> CK+RP> CK+Al-P > P，磷敏感基因型99056为CK+Al-P > CK+RP > P>CK；缺磷处理，秧苗活化吸收难溶性磷源的能力均为OP> Al-P> RP，且不同基因型的分解吸收能力对OP为99011> 508> 580> 99012> 99112> 99056（表2），对Al-P为580> 99011> 99112> 508> 99056> 99012（表3），对RP为580> 99112> 99011> 508> 99012> 99056（表2）。此外，缺磷即CK处理，508对低浓度的磷吸收最多(表2和表3)，而580对磷的利用效率显著高于其他基因型（表3），这些特征可能也是它们耐低磷的重要贡献因子之一。
Four low-P tolerant rice genotypes named 99011, 580, 508 and 99112 were used with two low-P sensitive rice genotypes named 99012 and 99056 as reference, to investigate the genetic differences for growth as influenced by different inorganic phosphorus supply, and availability and uptake ability to three insoluble P named organic P, Al-P and RP, using solution culture and sand quartz culture respectively. The results demonstrated that biomass and root dry weight of rices were reduced by low P, but R/S was affected by both supplied P level and uptake ability of plant to low P. Under the condition of low P, the biomass and root dry weight with different inorganic phosphorus treatments were P> CK+Al-P > CK+RP > CK; root dry weight and root shoot ratio of four low-P tolerant rice genotypes were larger than those of two low-P sensitive rice genotypes; For R/S, 580 and 99011 were CK+RP > CK+Al-P > CK> P, 508, 99112 and 99012 were CK> CK+RP > CK+Al-P > P, but 99056 was CK+Al-P > CK+RP > P> CK. The availability of sparingly soluble phosphates and organic phosphorus absorbed by rice seedlings was OP> Al-P> RP, but different rice cultivars had significant difference in response to three insoluble P compounds. P uptake amount for organic phosphorus was 99011> 508> 580> 99012> 99112> 99056, for Al-P was 580> 99011> 99112> 508> 99056> 99012, and for RP was 580> 99112> 99011> 508> 99012> 99056. Furthermore 508 has highest uptake efficiency to low phosphorus; 580 has highest P utilization efficiency , and absorbed more sparingly soluble phosphorus especially Al-P and RP than others; They are maybe one of the important reasons in 508 and 580 for low-P tolerance in 508 and 580. Low-P tolerant rice genotype 99112, a special material, it has small biomass and achieve high relative grain yield. As for low-P sensitive rice genotype 99056, its utilization efficiency to phosphorus is not low, but it just has small root system, only active and uptake a little sparingly soluble phosphorus, and can not absorb low concentration phosphorus.
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