Functional biology of plant phosphate uptake at root and mycorrhiza interfaces
2007
Bucher, Marcel
CONTENTS: Summary 11 I. Introduction 11 II. Phosphate uptake and its regulation 14 III. Phosphate uptake assisted by the arbuscular–mycorrhizal 18 symbiosis IV. Agricultural potential 21 V. Conclusions and perspectives 21 Acknowledgements 22 References 22 SUMMARY: Phosphorus (P) is an essential plant nutrient and one of the most limiting in natural habitats as well as in agricultural production world‐wide. The control of P acquisition efficiency and its subsequent uptake and translocation in vascular plants is complex. The physiological role of key cellular structures in plant P uptake and underlying molecular mechanisms are discussed in this review, with emphasis on phosphate transport across the cellular membrane at the root and arbuscular–mycorrhizal (AM) interfaces. The tools of molecular genetics have facilitated novel approaches and provided one of the major driving forces in the investigation of the basic transport mechanisms underlying plant P nutrition. Genetic engineering holds the potential to modify the system in a targeted way at the root–soil or AM symbiotic interface. Such approaches should assist in the breeding of crop plants that exhibit improved P acquisition efficiency and thus require lower inputs of P fertilizer for optimal growth. Whether engineering of P transport systems can contribute to enhanced P uptake will be discussed.
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