Evolution of development of vascular cambia and secondary growth
Contents Summary577I.Introduction577II.Generalized function of vascular cambia and their developmental and evolutionary origins578III.Variation in secondary vascular growth in angiosperms581IV.Genes and mechanisms regulating secondary vascular growth and their evolutionary origins584V.Evolution of development approaches for the study of secondary vascular growth587VI.Conclusions589Acknowledgements589References589 Summary Secondary growth from vascular cambia results in radial, woody growth of stems. The innovation of secondary vascular development during plant evolution allowed the production of novel plant forms ranging from massive forest trees to flexible, woody lianas. We present examples of the extensive phylogenetic variation in secondary vascular growth and discuss current knowledge of genes that regulate the development of vascular cambia and woody tissues. From these foundations, we propose strategies for genomics-based research in the evolution of development, which is a next logical step in the study of secondary growth.