Morphological evolution in land plants: new designs with old genes

Area of Science:

• Evolutionary Biology
• Paleobotany
• Developmental Genetics

Background:

• Plant colonization of land over 470 million years ago was a pivotal event.
• This led to increased continental primary productivity and altered global biogeochemical cycles.
• Plant evolution involved significant body plan transformations, including new tissues and organ systems.

Purpose of the Study:

• To review the evolution of genes and developmental mechanisms driving plant morphology on land.
• To explore how early land plants developed complex body plans.
• To understand the genetic basis for the diversification of plant forms.

Main Methods:

• Review of recent studies on plant evolution.
• Analysis of genetic and developmental mechanisms in extant and fossil plants.
• Comparative genomics of gene families across plant lineages.

Main Results:

• Many gene families controlling plant development were present in early land plants.
• Novel plant morphologies evolved through the modification and reuse of pre-existing genetic toolkits.
• The radiation of plant forms was driven by genetic innovation and developmental plasticity.

Conclusions:

• The evolution of plant body plans on land was facilitated by the repurposing of ancient genetic mechanisms.
• Developmental gene networks provided the foundation for morphological innovation in early land plants.
• Understanding these genetic underpinnings is key to comprehending plant terrestrialization.