Leaf heteroblasty is the fascinating natural phenomenon by which plants produce different leaves as they grow and mature. This requires a complex interplay between cellular growth and time, and allows a single plant to manifest a diverse range of leaf shapes and sizes over its lifespan. In a recent paper in the journal Current Biology, scientists from the Max Planck Institute for Plant Breeding Research in Cologne have now shed light on how this intricate process occurs during leaf development of the small mustard plant
Arabidopsis thaliana. By studying the development of juvenile and adult leaves, they identified key differences in their cellular growth patterns, which they found were controlled by a SPL9-CYCD3 transcriptional module. These findings provide us with a deeper understanding of how the passing of time is encoded into organ growth and morphogenesis, and demonstrate the intricate tempo of plant growth and development.
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