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Genetic architecture underlying variation in floral meristem termination in Aquilegia

View ORCID ProfileYa Min, View ORCID ProfileEvangeline S. Ballerini, Molly B. Edwards, View ORCID ProfileScott A. Hodges, View ORCID ProfileElena M. Kramer
doi: https://doi.org/10.1101/2021.10.18.464884
Ya Min
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA
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Evangeline S. Ballerini
2California State University, Sacramento, Biological Sciences, 6000 J St., Sacramento, CA, USA
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Molly B. Edwards
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA
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Scott A. Hodges
3Department of Ecology & Marine Biology, Department of Ecology & Marine Biology, University of California, Santa Barbara, CA, USA
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Elena M. Kramer
1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA
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  • For correspondence: ekramer@oeb.harvard.edu
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ABSTRACT

Floral organs are produced by floral meristems (FMs), which harbor stem cells in their centers. Since each flower only has a finite number of organs, the stem cell activity of a FM will always terminate at a specific time point, a process termed floral meristem termination (FMT). Variation in the timing of FMT can give rise to floral morphological diversity, but how this process is fine-tuned at a developmental and evolutionary level is poorly understood. Flowers from the genus Aquilegia share identical floral organ arrangement except for stamen whorl numbers (SWN), making Aquilegia a well-suited system for investigation of this process: differences in SWN between species represent differences in the timing of FMT. By crossing A. canadensis and A. brevistyla, quantitative trait locus (QTL) mapping has revealed a complex genetic architecture with seven QTL. We identified potential candidate genes under each QTL and characterized novel expression patterns of select candidate genes using in situ hybridization. To our knowledge, this is the first attempt to dissect the genetic basis of how natural variation in the timing of FMT is regulated and our results provide insight into how floral morphological diversity can be generated at the meristematic level.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted October 19, 2021.
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Genetic architecture underlying variation in floral meristem termination in Aquilegia
Ya Min, Evangeline S. Ballerini, Molly B. Edwards, Scott A. Hodges, Elena M. Kramer
bioRxiv 2021.10.18.464884; doi: https://doi.org/10.1101/2021.10.18.464884
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Genetic architecture underlying variation in floral meristem termination in Aquilegia
Ya Min, Evangeline S. Ballerini, Molly B. Edwards, Scott A. Hodges, Elena M. Kramer
bioRxiv 2021.10.18.464884; doi: https://doi.org/10.1101/2021.10.18.464884

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