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Temporal Phosphorus Allocation and Resorption Plasticity Drive Interspecific Phosphorus-Use Efficiency in

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Rice shows higher phosphorus-use efficiency (PUE) than rapeseed due to prolonged internal phosphorus recycling. This research offers insights into optimizing crop selection for sustainable agriculture.

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Biochemistry

Background:

  • Diversified cropping rotations enhance agricultural sustainability.
  • Understanding interspecific differences in phosphorus-use efficiency (PUE) is crucial for optimizing crop yields.
  • The physiological basis for varying PUE among species requires further investigation.

Purpose of the Study:

  • To investigate species-specific temporal dynamics of leaf phosphorus allocation, resorption, and their coordination with lipid metabolism and photosynthesis.
  • To compare the PUE and physiological strategies of rice and rapeseed in a rotation system.
  • To elucidate the mechanisms underlying enhanced PUE in crop species.

Main Methods:

  • Comparative analysis of leaf phosphorus dynamics in rice and rapeseed.
  • Assessment of phosphorus resorption capacity and its temporal regulation.
  • Investigation of the interplay between phosphorus metabolism, lipid metabolism, and photosynthesis.
  • Evaluation of plant responses under phosphorus deficiency.

Main Results:

  • Rice demonstrated higher PUE and phosphorus resorption efficiency than rapeseed.
  • Rice exhibited prolonged phosphorus remobilization throughout its leaf lifespan, facilitated by efficient inorganic-P export and coordinated degradation of phosphorus-containing compounds.
  • Rapeseed minimized lipid-P investment and confined phosphorus resorption to a shorter senescence phase.
  • Under phosphorus deficiency, rapeseed prioritized phospholipid replacement, while rice maintained high resorption through simultaneous degradation of phospholipids and nucleic acids.

Conclusions:

  • A higher inorganic/organic phosphorus ratio and extended internal phosphorus recycling contribute to enhanced PUE.
  • Species-specific strategies in phosphorus allocation and remobilization are key to PUE.
  • Findings provide valuable insights for optimizing crop selection and precision phosphorus management in sustainable cropping systems.