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19 April 2024 |
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From Many, One: Genetic Control of Prolificacy during Maize Domestication | | David M. Wills
; Clinton Whipple
; Shohei Takuno
; Lisa E. Kursel
; Laura M. Shannon
; Jeffrey Ross-Ibarra
; John F. Doebley
; | | Date: |
4 Mar 2013 | | Abstract: | A reduction in number and an increase in size of inflorescences is a common
aspect of plant domestication. When maize was domesticated from teosinte, the
number and arrangement of ears changed dramatically. Teosinte has long lateral
branches that bear multiple small ears at their nodes and tassels at their
tips. Maize has much shorter lateral branches that are tipped by a single large
ear with no additional ears at the branch nodes. To investigate the genetic
basis of this difference in prolificacy (the number of ears on a plant), we
performed a genome-wide QTL scan. A large effect QTL for prolificacy (prol1.1)
was detected on the short arm of chromosome one in a location that has
previously been shown to influence multiple domestication traits. We
fine-mapped prol1.1 to a 2.7 kb interval or causative region upstream of the
grassy tillers1 gene, which encodes a homeodomain leucine zipper transcription
factor. Tissue in situ hybridizations reveal that the maize allele of prol1.1
is associated with up-regulation of gt1 expression in the nodal plexus. Given
that maize does not initiate secondary ear buds, the expression of gt1 in the
nodal plexus in maize may suppress their initiation. Population genetic
analyses indicate positive selection on the maize allele of prol1.1, causing a
partial sweep that fixed the maize allele throughout most of domesticated
maize. This work shows how a subtle cis-regulatory change in tissue specific
gene expression altered plant architecture in a way that improved the
harvestability of maize. | | Source: | arXiv, 1303.0882 | | Services: | Forum | Review | PDF | Favorites | |
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