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Heritable variation in the inflorescence replacement program of Arabidopsis thaliana

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Abstract

Owing to their sessile habits and trophic position within global ecosystems, higher plants display a sundry assortment of adaptations to the threat of predation. Unlike animals, nearly all higher plants can replace reproductive structures lost to predators by activating reserved growing points called axillary meristems. As the first step in a program aimed at defining the genetic architecture of the inflorescence replacement program (IRP) of Arabidopsis thaliana, we describe the results of a quantitative germplasm survey of developmental responses to loss of the primary reproductive axis. Eighty-five diverse accessions were grown in a replicated common garden and assessed for six life history traits and four IRP traits, including the number and lengths of axillary inflorescences present on the day that the first among them re-flowered after basal clipping of the primary inflorescence. Significant natural variation and high heritabilities were observed for all measured characters. Pairwise correlations among the 10 focal traits revealed a multi-dimensional phenotypic space sculpted by ontogenic and plastic allometries as well as apparent constraints and outliers of genetic interest. Cluster analysis of the IRP traits sorted the 85 accessions into 5 associations, a topology that establishes the boundaries within which the evolving Arabidopsis genome extends and restricts the species’ IRP repertoire to that observable worldwide.

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Acknowledgments

We thank Miranda Neuhaus, Melissa Pindel, Kirsten Grau and Lucy Kehinde for expert assistance with phenotyping plants and entering data for analysis; and, the Research Board of the University of Illinois at Urbana-Champaign for support.

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Authors and Affiliations

  1. Department of Plant Biology, University of Illinois, 191 Edward R. Madigan Laboratory, 1201 West Gregory Drive, Urbana, IL, 61801, USA

    Cecile M. Sano & Thomas W. Jacobs

  2. Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    Martin O. Bohn

  3. Department of Animal Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    Ken N. Paige

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  1. Cecile M. Sano
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Correspondence to Thomas W. Jacobs.

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Communicated by M. Kearsey.

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Sano, C.M., Bohn, M.O., Paige, K.N. et al. Heritable variation in the inflorescence replacement program of Arabidopsis thaliana . Theor Appl Genet 119, 1461–1476 (2009). https://doi.org/10.1007/s00122-009-1148-5

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