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Related Concept Videos

Green Algae01:21

Green Algae

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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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Bacterial Phylum Cyanobacteria01:30

Bacterial Phylum Cyanobacteria

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Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
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Red Algae01:23

Red Algae

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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 Algae01:28

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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...
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Other Algae01:19

Other Algae

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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...
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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.
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A one-billion-year-old multicellular chlorophyte.

Qing Tang1, Ke Pang2,3, Xunlai Yuan2,3

  • 1Department of Geosciences and Global Change Center, Virginia Tech, Blacksburg, VA, USA. qingt@vt.edu.

Nature Ecology & Evolution
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Summary
This summary is machine-generated.

Ancient marine algae, chlorophytes, evolved multicellularity and macroscopic size much earlier than previously believed. Fossils from 1 billion years ago reveal complex early plant life, impacting marine ecosystems.

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Area of Science:

  • Paleobotany
  • Marine Ecology
  • Evolutionary Biology

Background:

  • Chlorophytes (green algae) likely dominated ancient marine ecosystems and bioproductivity before the rise of diatoms and dinoflagellates.
  • Molecular and biomarker data suggest chlorophyte divergence in the Proterozoic era, with diversification in the Neoproterozoic and Paleozoic.

Purpose of the Study:

  • To test the model of early chlorophyte evolution using paleontological data.
  • To investigate the fossil record for evidence of early multicellular and macroscopic chlorophytes.

Main Methods:

  • Analysis of millimetre-sized macrofossils from approximately 1-billion-year-old rocks.
  • Morphological and phylogenetic interpretation of fossil specimens.

Main Results:

  • Discovery of abundant, millimetre-sized, multicellular, and morphologically differentiated macrofossils.
  • Identification of these fossils as Proterocladus antiquus, interpreted as benthic siphonocladalean chlorophytes.

Conclusions:

  • Chlorophytes achieved macroscopic size, multicellularity, and cellular differentiation nearly a billion years ago.
  • This finding significantly predates previous estimates for these evolutionary milestones in green algae.