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从营养学角度了解不同耐低磷水稻基因型在低磷胁迫时各基因型对氮、磷、钾3大营养元素的吸收能力及利用能力的差异。结果表明,水稻各基因型对低磷胁迫的适应能力与氮肥、钾肥的吸收量相关不显著,与磷肥的吸收量达显著负相关,即低磷胁迫下耐低磷基因型吸收磷肥量较正常磷处理下明显增加,低磷敏感基因型吸收磷肥量较正常磷处理下明显减少;水稻各基因型植株含氮量与氮效率、植株含磷量与磷效率、植株含钾量与钾效率之间均无显著相关性。根据植株肥料利用效率(干重/含肥量)将水稻不同基因型分为4类:Ⅰ增效型、Ⅱ受抑制型、Ⅲ钝感型、Ⅳ互作型。在耐低磷基因型筛选时应选择肥效类型属Ⅰ型和Ⅳ互作型中磷肥利用效率较正常磷处理下增加的水稻基因型。
From the nutritional point of view, the genotypes of different low-phosphorus-tolerant rice genotypes were tested for their absorption and utilization abilities of nitrogen, phosphorus and potassium nutrition elements under low-phosphorus stress. The results showed that the adaptability of genotypes to low-P stress was not significantly correlated with the uptake of nitrogen and potassium, but negatively correlated with the uptake of phosphate fertilizer, ie, Under phosphorus stress, the phosphorus uptake by low-phosphorus-sensitive genotypes decreased significantly compared with that under normal phosphorus treatments. The nitrogen and nitrogen efficiency, plant phosphorus and phosphorus efficiency, plant potassium and potassium efficiency There was no significant correlation between them. According to the plant fertilizer utilization efficiency (dry weight / fertilizer content), different genotypes of rice were divided into four groups: Ⅰ synergistic, Ⅱ inhibited, Ⅲ insensitive, Ⅳ interaction. In the screening of low-phosphorus-tolerant genotypes, the genotypes of fertilizer efficiency should be selected for genotypes Ⅰ and Ⅳ.