Abstract
The plant hormone auxin plays an integral role in numerous aspects of plant development, from embryogeny through secondary growth, which has raised the question of whether changes in auxin signaling underlie major morphological changes in land plant evolution. However, the majority of available data on auxin action come from studies of angiosperms, and it is unclear to what extent these data can be applied to other plant lineages, particularly seed-free plants. Here we review the current state of knowledge on auxin and its role in seed-free plant development, with a focus on polar auxin transport, and illustrate the value of using reciprocal illumination approaches that integrate the fossil record for understanding the evolution of plant form and development. Our survey reveals that while there are some differences, particularly between lycophytes and euphyllophytes, the general patterns of polar auxin transport and auxin action appear to be shared among all tracheophytes. Based on these data, we provide insights and testable hypotheses on leaf and rooting system evolution among lycophytes, demonstrating the utility of anatomical fingerprints of development. However, we also find that numerous gaps in our understanding of the roles of auxin in seed-free plants remain that stymie further progress. Filling these gaps will require continuing incremental research on seed-free plant development, from anatomy to developmental genetics, but has broad potential for making significant contributions to our understanding of patterns and processes in plant evolution.
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Matsunaga, K.K.S., Tomescu, A.M.F. (2018). Reciprocal Illumination and Fossils Provide Important Perspectives in Plant Evo-devo: Examples from Auxin in Seed-Free Plants. In: Fernández, H. (eds) Current Advances in Fern Research. Springer, Cham. https://doi.org/10.1007/978-3-319-75103-0_10
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