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Related Concept Videos

Anatomy of Chloroplasts01:07

Anatomy of Chloroplasts

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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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The Anatomy of Chloroplasts01:08

The Anatomy of Chloroplasts

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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...
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Protein Transport to the Stroma01:24

Protein Transport to the Stroma

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Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
Protein complexes called the translocon of the outer chloroplast membrane or TOC complex, and the translocon of the inner chloroplast membrane or TIC complex mediate the...
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Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

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Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
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Protein Transport to the Inner Chloroplast Membrane01:18

Protein Transport to the Inner Chloroplast Membrane

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Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
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Photosystems01:32

Photosystems

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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...
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Related Experiment Video

Updated: Nov 6, 2025

Studying the Supramolecular Organization of Photosynthetic Membranes within Freeze-fractured Leaf Tissues by Cryo-scanning Electron Microscopy
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Studying the Supramolecular Organization of Photosynthetic Membranes within Freeze-fractured Leaf Tissues by Cryo-scanning Electron Microscopy

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Chloroplast dismantling in leaf senescence.

Fernando Domínguez1, Francisco Javier Cejudo1

  • 1Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla and Consejo Superior de Investigaciones Científicas, Avda. Américo Vespucio 49, 41092-Sevilla, Spain.

Journal of Experimental Botany
|May 7, 2021
PubMed
Summary

Chloroplast dismantling is a regulated process crucial for plant development and acclimation. This review examines how redox homeostasis and reactive oxygen species (ROS) influence chloroplast breakdown during senescence and stress.

Keywords:
AutophagyROSchlorophagychloroplastgerontoplastplastoglobulesenescence

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Area of Science:

  • Plant Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Chloroplasts are vital for plant growth, producing metabolic intermediates and sensing environmental cues.
  • Chloroplasts play a key role in plant acclimation and development by harmonizing organ growth.
  • Chloroplast dismantling is a regulated process, essential for remobilizing resources during senescence.

Purpose of the Study:

  • To review the impact of redox homeostasis and reactive oxygen species (ROS) on chloroplast dismantling.
  • To summarize the structural and biochemical events in chloroplast breakdown during senescence and stress.

Main Methods:

  • Literature review focusing on chloroplast dismantling.
  • Analysis of redox homeostasis and ROS generation in chloroplasts.
  • Examination of intra- and extraplastid events during dismantling.

Main Results:

  • Environmental stress increases ROS production in chloroplasts, potentially causing oxidative damage.
  • Rapid dismantling of damaged chloroplasts is triggered by stress to prevent toxic by-product accumulation.
  • Redox homeostasis and ROS are critical regulators of chloroplast dismantling.

Conclusions:

  • Chloroplast dismantling is a tightly controlled process vital for plant development and stress response.
  • Understanding chloroplast dismantling mechanisms is crucial for plant acclimation and resource management.