Abstract:

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.

Key words: Aerenchyma, Phosphorus, Recycle, Maize, ³²P isotope tracing