Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using 32P Tracer

Phosphorus (P) is among the most intractable constraints on plant fertility, particularly in acidic soils with high P fixation capacities. The effects of nutrient limitation and adaptive strategies plants infertile are central topics ecology. development tree cultivars greater use efficiency (PUE), defined as ability a to grow be productive reduced availability, would substantially improve forest development. redistribute transfer across fractions determines their adaptability limitations. However, mechanisms utilization transport remain unknown Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) from perspective fraction distribution. In this study, we investigated distribution translocation patterns exogenous different M1 fir, which was identified exhibiting P-deficient resistance maintaining higher yield under low stress relative average clones, using 32P tracking, can accurately trace migration pathways after absorption. We found that roots than stems or leaves low-P conditions amount absorbed by significantly reduced. Under conditions, optimized allocation, led PUE high-P highest leaves, followed roots. clone maintained ratio soluble (i.e., inorganic ester P) its stems, improved mobility recycling limited P. roots, shifted insoluble nucleic P), but total concentration relatively stable, may ensure root growth absorption Our results confirm reduces demand, optimizes allocation fractions, increases maintain aboveground productivity response conditions.