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The Phosphorus Cycle01:21

The Phosphorus Cycle

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Primary Production01:06

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
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  1. Home
  3. Interactions Between Nitrogen And Phosphorus Modulate The Food Quality Of The Marine Crop Pyropia Haitanensis (t. J. Chang & B. F. Zheng) N. Kikuchi & M. Miyata (porphyra Haitanensis).
  1. Home
  3. Interactions Between Nitrogen And Phosphorus Modulate The Food Quality Of The Marine Crop Pyropia Haitanensis (t. J. Chang & B. F. Zheng) N. Kikuchi & M. Miyata (porphyra Haitanensis).

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Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management
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Interactions between nitrogen and phosphorus modulate the food quality of the marine crop Pyropia haitanensis (T. J.

Ningning Xu1, Kai Xu1, Yan Xu1

  • 1Fisheries College, Jimei University, Xiamen, China; Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Xiamen, China; Fujian Engineering Research Center of Aquatic Breeding and Healthy Aquaculture, Xiamen, China; State Key Laboratory of Mariculture Breeding, Fisheries College of Jimei University, Ningde, China.

Food Chemistry
|March 24, 2024

View abstract on PubMed

Summary
This summary is machine-generated.
Keywords:
Carbon/nitrogen metabolismColorationFlavorFood qualityNitrogenPyropia haitanensis

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High nitrogen and phosphorus levels improve seaweed quality by enhancing pigment and amino acid production, while affecting carbohydrate content. This study reveals the molecular mechanisms behind nutrient regulation in Pyropia haitanensis.

Area of Science:

  • Marine Biology
  • Phycology
  • Nutritional Biochemistry

Background:

  • Seaweed quality, specifically in Pyropia haitanensis, is significantly influenced by nutrient availability.
  • The precise molecular mechanisms governing the synergistic effects of nitrogen (N) and phosphorus (P) on seaweed quality remain largely unexplored.

Purpose of the Study:

  • To investigate the combined impact of nitrogen and phosphorus on the quality of Pyropia haitanensis.
  • To elucidate the molecular mechanisms underlying nutrient-regulated seaweed quality.

Main Methods:

  • Physiological analyses were conducted.
  • Multi-omics approaches were employed to analyze changes at the molecular level.

Main Results:

  • High nitrogen availability led to increased pigment accumulation, enhanced N metabolism, porphyrin metabolism, and amino acid metabolism, boosting nutritional value and taste by increasing amino acid and inosine 5'-mononucleotide (IMP) content while decreasing agaro-carrageenan and cellulose.
  • High phosphorus availability promoted carbon and amino acid metabolism.
  • Intense thalli coloration was observed under high N conditions.

    • Conclusions:

    • Nitrogen and phosphorus play crucial synergistic roles in regulating the quality of Pyropia haitanensis.
    • Understanding these nutrient-driven molecular pathways provides a foundation for optimizing seaweed cultivation and quality.