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Related Concept Videos

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.
Protein Transport to the Stroma01:24

Protein Transport to the Stroma

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...
Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

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.
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...
Short-distance Transport of Resources02:12

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
Protein Transport to the Thylakoids01:22

Protein Transport to the Thylakoids

Thylakoids are membrane-bound sac-like structures within the chloroplast that serve as sites for photosynthesis. Thylakoid lumen contains many electron transport proteins and is enclosed by a thylakoid membrane rich in the light-harvesting complex. Proteins targeted to the thylakoids are transported as precursors and are sorted by the general TOC/TIC import pathway. Once the precursor reaches the stroma, stromal processing peptidases remove their transit signal and expose thylakoid signal...

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Related Experiment Video

Updated: May 9, 2026

Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana
07:45

Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana

Published on: July 14, 2021

Chloroplast movement.

Masamitsu Wada1

  • 1Biology Department, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan. wadascb@kyushu-u.org

Plant Science : an International Journal of Experimental Plant Biology
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

Plant chloroplast movement, crucial for photosynthesis and survival, is regulated by blue light receptors phototropin 1 (phot1) and phototropin 2 (phot2). Actin filaments and CHUP1 drive this movement, with various microscopy techniques enabling its study.

Keywords:
Actin filamentsBlue lightChloroplastMicrobeam irradiationMovementPhototropinTIRFMchloroplast-actin filamentscp-actin filamentstotal internal reflection fluorescence microscope

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Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana
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Isolation of Physiologically Active Thylakoids and Their Use in Energy-Dependent Protein Transport Assays
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Area of Science:

  • Plant biology
  • Cellular biophysics
  • Photosynthesis research

Background:

  • Chloroplast movement is vital for optimizing light capture in plants, balancing high light avoidance with low light accumulation for efficient photosynthesis.
  • This process is mediated by specific photoreceptors and cytoskeletal components, but the underlying mechanisms require further elucidation.

Purpose of the Study:

  • To review recent advancements in understanding chloroplast movement mechanisms and signal transduction pathways.
  • To highlight and evaluate various analytical methods for studying chloroplast responses to light stimuli.

Main Methods:

  • Analysis of chloroplast distribution patterns using fixed cell sectioning.
  • Time-lapse photography under infrared light to record chloroplast behavior during light-induced movement.
  • Confocal laser scanning microscopy (CLSM) and total internal reflection fluorescence microscopy (TIRFM) to visualize cp-actin filaments and CHUP1 in transgenic Arabidopsis.

Main Results:

  • Phototropin 2 (phot2) mediates avoidance from strong light, while phototropin 1 (phot1) and phot2 mediate accumulation in weak light.
  • Chloroplast actin (cp-actin) filaments, polymerized by Chloroplast Unusual Positioning1 (CHUP1), are essential for chloroplast movement.
  • Various microscopy techniques offer different advantages for visualizing and analyzing chloroplast movement dynamics and molecular players.

Conclusions:

  • Understanding chloroplast movement requires integrating knowledge of light perception, signal transduction, and cytoskeletal dynamics.
  • Advanced imaging techniques like CLSM and TIRFM are crucial for dissecting the molecular mechanisms of chloroplast repositioning.
  • This review provides a foundation for future research into optimizing plant light responses and photosynthetic efficiency.