论文部分内容阅读
本研究用营养液培养法定量地测定并计算了在正常供磷及缺磷后不同时间黄瓜植株体内磷的分布及再运输。缺磷处理５天后，新生叶和根系中的吸磷量明显增加，分别占植株总吸磷量的３６．１％和１３．５％，而相应的正常供磷植株的新生叶和根系中的吸磷量仅分别占植株总吸磷量的２２．４％和６．３４％，而且缺磷植株根系的生长显著快于供磷的植株。缺磷胁迫１０天后，植株地上部生长受到明显抑制，老叶中的磷通过韧皮部运向新生叶以保证新生器官的生长，使新生叶中磷的浓度比老叶中高４７％，但缺磷植株根系中磷的累积量下降不多。本研究还定量证明了即使在正常供磷条件下，随着生长时间的延长，也有大量的磷由老叶运向新叶。不论缺磷与否，植株新生叶和根中磷的浓度都保持最高，但缺磷和供磷植物体中磷的分配模式不同。
In this study, nutrient solution culture was used to quantitatively determine and calculate the distribution and re-transportation of phosphorus in cucumber plants at different periods after normal phosphorus supply and phosphorus deficiency. After 5 days of phosphorus deficiency treatment, the uptake of phosphorus in new leaves and roots increased significantly, accounting for 36.1% and 13.5% of the total phosphorus uptake of plants, respectively, whereas in the new leaves and roots of the corresponding normal P supply plants Phosphorus uptake accounted for only 22.4% and 6.34% of the total phosphorus uptake by plants respectively, and the root growth of phosphate-deficient plants was significantly faster than that of phosphorus-supplied plants. After 10 days of phosphorus deficiency, the shoot growth was significantly inhibited. Phosphorus in the old leaves migrated to the new leaf through the phloem to ensure the growth of new organs. The phosphorus concentration in the new leaves was 47% higher than that in the old leaves. However, Phosphorus accumulation in root decreased little. This study also quantitatively proved that, even under the normal conditions of phosphorus supply, a large amount of phosphorus is transported from the old leaf to the new leaf with the growth of the growth time. Regardless of lack of phosphorus or not, the phosphorus concentration in the new leaves and roots of the plants remained the highest, but the patterns of phosphorous allocation were different for phosphorus-deficient and phosphorus-supplying plants.