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Related Concept Videos

Red Algae01:23

Red Algae

Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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Overview of Algae

The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
Morphogenesis02:19

Morphogenesis

Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
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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.
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Methods for the Study of Regeneration in Stentor
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Morphogenesis in giant-celled algae.

Ichiro Mine1, Diedrik Menzel, Kazuo Okuda

  • 1Graduate School of Kuroshio Science, Kochi University, Kochi, 780-8520, Japan.

International Review of Cell and Molecular Biology
|June 12, 2008
PubMed
Summary

Giant-celled algae exhibit unique cellular processes, including growth and division, regulated by cytoskeletal dynamics and environmental factors. The model organism Acetabularia offers insights into gene expression

Area of Science:

  • Cell Biology
  • Algal Physiology
  • Cytoskeletal Dynamics

Background:

  • Giant-celled algae possess unique cell architecture and physiological characteristics, with cells ranging from millimeters to centimeters in size.
  • These algae exhibit diverse morphogenetic phenomena, including growth, division, differentiation, reproduction, and wound healing.

Purpose of the Study:

  • To investigate the involvement of microtubules and actin filaments in intracellular movement and spatial control within giant algal cells.
  • To understand how environmental factors like light and gravity influence cellular reactions and morphogenesis.
  • To explore the roles of cytoskeletal and endomembrane dynamics, electrophysiology, and cell wall properties in regulating these processes.

Main Methods:

  • Immunofluorescence microscopy to visualize cytoskeletal components.

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  • Pharmacological approaches to study the effects of specific agents on cellular processes.
  • Investigation of environmental stimuli (light, gravity) and their cellular responses.

    • Main Results:

    • Microtubules and actin filaments are crucial for intracellular transport and spatial organization in giant algal cells.
    • Environmental stimuli elicit localized and generalized cellular reactions, impacting morphogenesis.
    • Signal transduction and hormonal control pathways are involved in regulating cellular activities.

    Conclusions:

    • Giant-celled algae, particularly Acetabularia, serve as valuable models for studying complex cellular morphogenesis.
    • Understanding cytoskeletal dynamics, environmental responses, and regulatory pathways is key to deciphering cellular development.
    • Acetabularia's utility in past experiments suggests its potential for future research on gene expression's role in morphogenesis.