磷在植物体内可被活化和循环利用，因此磷的再利用程度成为评价植物磷营养效率的重要指标。低磷胁迫下植物根皮层细胞解体形成通气组织的过程中，原细胞内磷素可能被转运到根尖用于根轴的伸长从而扩大吸收范围，并提高体内磷素的利用效率。本研究旨在检验这一假设。试验结果表明，在低磷胁迫下，玉米种子根皮层细胞的磷素在细胞解体过程中主要被转运往茎叶重新利用。
The mobilization and transportation of phosphorus from old tissues to young and active metabolized tissues are important physiological processes in plant, so the extent or degree of phosphorus recycling in plant has been considered as one of indexes for evaluating plant phosphorus efficiency. The previous researches have shown that parts of root cortical cells are formed lysigenous aerenchyma when maize plant is subjected to phosphorus deficiency. The present study was to test the hypotheses that phosphorus might be mobilized and transported from the root cortical cells with lysis to root apex for root enlongation. 32P isotope tracing technique was used in this study, and the results indicated that phosphorus stored or pre-existed in roots would be remobilized in maize under phosphorus deficiency from root cortical cells with lysis to shoot mostly rather than root apex during aerenchyma formation.
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