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Streptophyte Terrestrialization in Light of Plastid Evolution
Jan de Vries1, Amanda Stanton2, John M Archibald2
1Institute for Molecular Evolution, Heinrich-Heine-University (HHU) Düsseldorf, 40225 Düsseldorf, Germany.
Trends in Plant Science
|February 21, 2016
Summary
The evolution of land plants involved key changes in algae, particularly the transfer of plastid genes to the nucleus. This "embryoplast" evolution in streptophyte algae was crucial for terrestrialization.
Area of Science:
- Evolutionary Biology
- Plant Science
- Algal Biology
Background:
- The transition of plants to land (terrestrialization) is a significant evolutionary event.
- Zygnematophycean algae are identified as the closest relatives to embryophytes (land plants).
- Many traits enabling land colonization are present in various streptophyte algae.
Purpose of the Study:
- To explore the role of chloroplast evolution in the terrestrialization of plants.
- To investigate novel exaptations related to chloroplasts during plant evolution.
- To highlight the importance of the streptophyte chloroplast, termed the 'embryoplast', in land plant emergence.
Main Methods:
- Comparative analysis of streptophyte algae and land plants.
- Review of genetic and cellular adaptations for terrestrial life.
- Focus on plastid gene transfer to the nucleus as a key evolutionary event.
Main Results:
- Zygnematophycean algae share the unique trait of plastid gene transfer to the nucleus with land plants.
- The evolution of the chloroplast into the 'embryoplast' is proposed as a critical, yet understudied, factor in terrestrialization.
- Chloroplast-associated exaptations are suggested to be as vital as host cell adaptations for land conquest.
Conclusions:
- The evolution of the streptophyte chloroplast ('embryoplast') was a pivotal factor in the emergence of land plants.
- Plastid gene transfer to the nucleus represents a significant exaptation for terrestrial life.
- Further research into chloroplast contributions to plant terrestrialization is warranted.
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