不同拟南芥磷营养效率的差异及其营养机理初探

Study on phosphorus efficiency of various Arabidopsis and its nutritional mechanism

将初步筛选出3个磷高效(01,03,05)和4个磷低效(02,04,06,07)共7个拟南芥在人工培养室营养液培养条件下进行培养,以低磷与适宜磷条件下种子产量的比值作为磷效率系数,结果证明,它们的磷效率系数与初步筛选结果一致。试验还表明,拟南芥苗期生物量的磷效率系数与种子含量的磷效率系数基本一致,即各拟南芥的磷效率差异在苗期已显现。在低磷胁迫条件下,磷高效的拟南芥幼苗比磷低效的拟南芥幼苗具有较长的主根,较大的根冠比值,较高的含磷量和磷积累量,较强的酸性磷酸酯酶活性,是其磷高效的可能机理。

Under the condition of greenhouse, three phosphorus efficient Arabidopsis and four phosphorus inefficient Arabidopsis obtained from several screening experiments were examined further using the criterion of phosphorus efficient coefficient, e.g. the ratio of yield at phosphorus deficient level to phosphorus normal level, with solution culture experiments. The results showed that the phosphorus efficient coefficient at seedling stage was identical to that at mature stage, which indicated that phosphorus efficient Arabidopsis showed the characteristics of phosphorus efficiency at seedling stage and it was effective to screen phosphorus efficient Arabidopsis at seedling stage. The nutrition mechanism of phosphorus efficient Arabidopsis might be attributed to longer root, higher ratio of root to shoot, more phosphorus accumulation, and higher activity of acid phosphatase at phosphorus deficiency.