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The Anatomy of Chloroplasts

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...

Anatomy of Chloroplasts

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.

The Phragmoplast

The Phragmoplast

Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
The...

The Phragmoplast

The Phragmoplast

Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
The...

Animal and Plant Cell Structure

Animal and Plant Cell Structure

Animal and plant cells not only differ in their structure, function, and mode of nutrition but also in how they reproduce, specialize, and organize into complex structures.
Cell Division
Though both plant and animal cells divide by mitosis (for non-gametic cells) and meiosis (for gametic cells), they differ in the specifics of this process. Unlike animal cells, plant cells lack centrosomes — an organelle responsible for organizing the spindle fibers and segregating the chromosomes during cell...

Protein Transport to the Stroma

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...

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A Microfluidic Platform for Stimulating Chondrocytes with Dynamic Compression

A Microfluidic Platform for Stimulating Chondrocytes with Dynamic Compression

Published on: September 13, 2019

The dynamic plant chondriome.

David C Logan¹

¹Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada. david.logan@usask.ca

Seminars in Cell & Developmental Biology

|January 2, 2010

Summary

Plant mitochondrial dynamics, involving morphology and velocity, are crucial but poorly understood. Research highlights identified division genes but lacks fusion gene identification, impacting organelle function insights.

Area of Science:

Plant cell biology
Mitochondrial dynamics
Organelle research

Background:

The higher plant chondriome (mitochondrial network) exhibits significant dynamism in morphology and velocity within cells.
Plant mitochondrial dynamics research has advanced this century with new fluorescent protein tools and transformed plant lines.
While components of the plant mitochondrial division machinery are known, genes for mitochondrial fusion remain unidentified.

Purpose of the Study:

To review the current understanding of plant mitochondrial dynamics.
To highlight the gap in knowledge regarding mitochondrial fusion genes.
To discuss the limited evidence linking mitochondrial dynamics to specific organelle and cell functions.

Main Methods:

Literature review of plant mitochondrial dynamics research.

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Analysis of identified genes involved in mitochondrial division.

Examination of studies linking mitochondrial dynamics to cell death and cytokinesis.

Main Results:

Plant mitochondria are highly dynamic, with identified division apparatus components but no fusion genes.
Limited direct evidence connects mitochondrial dynamics to overall organelle and cell function.
Changes in mitochondrial dynamics are observed during programmed cell death induction and before cytokinesis.

Conclusions:

Despite advancements, the roles of mitochondrial dynamics in plant cell function, particularly fusion, require further investigation.
The identified division genes provide a starting point, but fusion mechanisms remain elusive.
Further research is needed to elucidate the functional significance of mitochondrial dynamics in plant cells.