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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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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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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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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Photoreceptors and Plant Responses to Light02:00

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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Related Experiment Video

Updated: May 3, 2026

High-Throughput Analysis of Non-Photochemical Quenching in Crops Using Pulse Amplitude Modulated Chlorophyll Fluorometry
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Optimal nitrogen distribution within a leaf canopy under direct and diffuse light.

Kouki Hikosaka1

  • 1Graduate School of Life Sciences, Tohoku University, Sendai, Miyagi, 980-8578, Japan; CREST, JST, Japan.

Plant, Cell & Environment
|February 11, 2014
PubMed
Summary

Optimizing nitrogen distribution in plant canopies significantly boosts carbon gain. This study reveals optimal nitrogen allocation differs between simple light models and those considering direct-diffuse light, highlighting a key trait for improving plant productivity.

Keywords:
canopy photosynthesislight distributionmodelnitrogen allocationnitrogen useoptimization

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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Agricultural Science

Background:

  • Nitrogen distribution in leaf canopies is crucial for canopy carbon gain.
  • Previous models predicted optimal nitrogen allocation based on proportional light absorption, often using Beer's Law.
  • The impact of considering both direct and diffuse light on optimal nitrogen distribution was not well understood.

Purpose of the Study:

  • To investigate optimal nitrogen distribution in plant canopies under direct-diffuse light conditions.
  • To compare optimal nitrogen distribution predicted by Beer's Law versus models incorporating direct and diffuse light.
  • To assess the potential for improving canopy carbon gain through optimized nitrogen distribution.

Main Methods:

  • Utilized an analytical solution to model nitrogen distribution.
  • Employed model simulations to analyze light extinction and nitrogen allocation.
  • Compared results from Beer's Law models with direct-diffuse light models.

Main Results:

  • Optimal nitrogen distribution differs significantly between Beer's Law and direct-diffuse light models.
  • The optimal nitrogen distribution under direct-diffuse light is steeper than under diffuse light alone.
  • Optimized nitrogen distribution substantially increased whole-canopy carbon gain compared to non-optimized canopies.

Conclusions:

  • Considering direct and diffuse light together alters predictions for optimal nitrogen distribution.
  • Steeper nitrogen distribution is favored under combined direct-diffuse light.
  • Optimizing nitrogen distribution presents a promising strategy for enhancing plant productivity and crop yields.