Annals of Botany

Downregulation of net phosphorus uptake vs. leaf resorption

A trade-off may exist between the capacity of plants to downregulate their phosphorus uptake capacity and the efficiency of resorption from leaves in severely impoverished environments.
Downregulation of net phosphorus uptake vs. leaf resorption
Downregulation of net phosphorus uptake vs. leaf resorption

A trade-off may exist between the capacity of plants to downregulate their phosphorus (P) uptake capacity and their efficiency of P resorption from senescent leaves in species from severely P-impoverished environments. de Campos et al. grow four Australian native species (Banksia attenuata, B. menziesii, Acacia truncata and A. xanthina) in nutrient solutions at a range of P concentrations and determine rates of uptake, leaf concentrations, and resorption proficiency values. The results support the hypothesis that the ability to resorb P from senescing leaves is inversely related to the capacity to downregulate net P uptake. Constitutive synthesis of P transporters may be a prerequisite for proficient P remobilization from senescing tissues.

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