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在水培条件下,研究不同浓度磷影响大豆根冠中碳分配的结果表明:磷有效性对大豆根冠中碳分配的影响依赖于磷浓度与胁迫时间。磷浓度高于0.125mmol·L-1或低磷胁迫7d以内,大豆根冠中碳分配受到的影响不显著。低磷胁迫14d的大豆的净光合速率和根呼吸速率均显著下降,根冠比显著提高。这显示长期低磷胁迫下大豆碳同化总量和根呼吸消耗的碳量虽然减少,但根系生长的碳消耗则增加,光合碳同化形成的碳水化合物向根部的分配是受到促进的。
Under the conditions of hydroponic culture, the effect of different phosphorus concentrations on carbon allocation in soybean rhizomes showed that the effect of phosphorus availability on carbon allocation in soybean rhizome depended on the phosphorus concentration and the stress time. Phosphorus concentration was higher than 0.125mmol·L-1 or under low-phosphorus stress within 7d, the distribution of carbon in soybean rhizome had no significant effect. The net photosynthetic rate and root respiration rate of soybean under P deficiency for 14 d decreased significantly, and the ratio of root to shoot increased significantly. The results showed that although the amount of carbon assimilation and the amount of carbon consumed by root respiration decreased under long-term low-phosphorus stress, the carbon consumption of root growth increased, and the distribution of carbohydrate assimilated by photosynthetic carbon was promoted to roots.