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Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques

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Angiosperm diversification through time.

Susana Magallón¹, Amanda Castillo

¹Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, 3er Circuito de Ciudad Universitaria, Del. Coyoacán, México D.F. 04510 Mexico.

American Journal of Botany

|June 2, 2011

Summary

This summary is machine-generated.

Angiosperm (flowering plant) diversity arose from varying speciation and extinction rates. Younger lineages show higher diversification rates, with mixed origins appearing in the Cretaceous period.

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Area of Science:

Evolutionary Biology
Paleobotany

Background:

Angiosperm (flowering plant) diversity is shaped by speciation and extinction rates.
Understanding the temporal trends of angiosperm diversification is crucial for evolutionary studies.

Purpose of the Study:

To document the temporal trends of angiosperm diversification rates during their early evolutionary history.
To estimate absolute diversification rates for order-level angiosperm clades.

Main Methods:

Utilized relaxed molecular clock analyses to derive ages for angiosperm clades.
Estimated absolute diversification rates for order-level clades, considering different age constraints.
Generated diversification through time plots to visualize rate trends.

Main Results:

Angiosperm diversification rates ranged from 0.0781 to 0.0909 net speciation events per million years.
Demonstrated an inverse relationship between clade age and diversification rate; younger clades exhibit higher rates.
Identified mixed origins for angiosperm diversity, with lineages appearing between 130-102 Mya and 102-77 Mya.

Conclusions:

Angiosperm diversification patterns are complex, with distinct origins contributing to overall diversity.
The timing of lineage diversification, particularly in the Cretaceous, significantly influenced the trajectory of angiosperm evolution.
Terminal lineages leading to extant species may have originated at various times relative to clade diversification.