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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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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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Rapid quantification of biological nitrogen fixation using optical spectroscopy.

Haiyang Zhang1,2, Jonathan M Plett2, Karen L M Catunda2

  • 1College of Life Sciences, Hebei University, Baoding, China.

Journal of Experimental Botany
|October 27, 2023
PubMed
Summary

Optical spectroscopy offers a rapid, cost-effective method to quantify biological nitrogen fixation (BNF). This technique accurately measures nitrogen (N) and isotopes, complementing traditional methods for BNF studies.

Keywords:
isotopic compositionnitrogen cyclespatial variationsymbiotic fixationtemporal variationδ15N

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Area of Science:

  • Agricultural Science
  • Plant Physiology
  • Biogeochemistry

Background:

  • Biological nitrogen fixation (BNF) is a critical global nitrogen input, but its accurate quantification is challenging.
  • Traditional methods like isotope ratio mass spectrometry (IRMS) are time-consuming and costly.
  • Leaf reflectance spectroscopy presents a faster alternative for assessing plant nitrogen status.

Purpose of the Study:

  • To develop and validate a novel, rapid, and inexpensive method for quantifying BNF using optical spectroscopy.
  • To compare optical spectroscopy-derived BNF measurements with traditional IRMS quantification.
  • To assess the method's ability to capture BNF responses to environmental changes.

Main Methods:

  • Plant tissues from controlled and field experiments were analyzed for nitrogen concentration ([N]), nitrogen isotope composition (δ15N), and N derived from atmospheric fixation (Ndfa) using IRMS.
  • Optical spectroscopy was employed to predict the same parameters ([N], δ15N, Ndfa) from the same tissues.
  • Spectroscopic predictions were validated against IRMS measurements.

Main Results:

  • Optical spectroscopy accurately predicted Ndfa, with high R2 values (0.90 in glasshouse, 0.94 in field) compared to IRMS.
  • The method demonstrated strong agreement with traditional quantification, with slopes close to 1.
  • Root mean square errors for predicting legume δ15N were low (0.38 and 0.43).

Conclusions:

  • Optical spectroscopy provides a rapid, scalable, and cost-effective tool for quantifying BNF.
  • This technique complements existing methods and facilitates broader BNF research.
  • The method effectively captures BNF dynamics under climate change scenarios like warming and drought.