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Related Concept Videos

Light Acquisition02:16

Light Acquisition

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.
The Antenna Complex01:15

The Antenna Complex

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...
The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A...
Photosystems01:32

Photosystems

Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...
Photosystem I01:27

Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.

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Related Experiment Video

Updated: May 11, 2026

High-Throughput, In-Field Screening of Photosynthetic Efficiency in Crop Plants Using an Autonomous Robot
07:12

High-Throughput, In-Field Screening of Photosynthetic Efficiency in Crop Plants Using an Autonomous Robot

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Does chloroplast size influence photosynthetic nitrogen use efficiency?

Yong Li1, Binbin Ren, Lei Ding

  • 1College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China.

Plos One
|April 27, 2013
PubMed
Summary

High nitrogen supply reduces photosynthetic efficiency in rice. Larger chloroplasts in

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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
10:20

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

Published on: August 9, 2019

Area of Science:

  • Plant Physiology
  • Photosynthesis Research
  • Crop Science

Background:

  • High nitrogen supply often decreases photosynthetic nitrogen-use efficiency (PNUE).
  • Chloroplasts house Rubisco and are critical for photosynthesis, but their developmental role is understudied.
  • Understanding chloroplast development's impact on photosynthesis is crucial for crop improvement.

Purpose of the Study:

  • To investigate the effect of varying nitrogen levels on chloroplast size and photosynthetic efficiency in rice.
  • To explore the relationship between chloroplast size, mesophyll conductance, and Rubisco activity under different nitrogen supplies.
  • To compare responses between two rice cultivars, 'Shanyou 63' and 'Yangdao 6'.

Main Methods:

  • Rice seedlings ('Shanyou 63', 'Yangdao 6') were hydroponically cultured with three nitrogen levels.
  • Measurements included morphological traits, photosynthetic variables, and chloroplast size.
  • Analysis focused on correlations between chloroplast size, PNUE, mesophyll conductance (gm), and Rubisco specific activity.

Main Results:

  • In 'Shanyou 63', larger chloroplasts correlated with decreased PNUE, reduced gm/Rubisco ratio, and lower Rubisco specific activity under high nitrogen.
  • 'Yangdao 6' showed no significant changes in chloroplast size, PNUE, or gm/Rubisco ratio with high nitrogen.
  • These findings suggest that enlarged chloroplasts under high N impair Rubisco efficiency.

Conclusions:

  • Chloroplast size is a key factor influencing photosynthetic nitrogen-use efficiency in rice.
  • Cultivar-specific responses to nitrogen supply highlight the importance of genetic background in chloroplast development and photosynthetic function.
  • Optimizing chloroplast development may be a strategy to enhance PNUE in rice cultivation.