Heritable variation in the inflorescence replacement program of <Emphasis Type="Italic">Arabidopsis thaliana</Emphasis> |
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Authors: | Cecile M Sano Martin O Bohn Ken N Paige Thomas W Jacobs |
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Institution: | (1) Department of Plant Biology, University of Illinois, 191 Edward R. Madigan Laboratory, 1201 West Gregory Drive, Urbana, IL 61801, USA;(2) Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;(3) Department of Animal Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; |
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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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