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The evolution of BARREN INFLORESCENCE1 and related AUX/IAA genes in angiosperms

Author: Robert Joseph Child
Publisher: [Long Beach, California] : California State University, Long Beach, 2013.
Dissertation: M.S. California State University, Long Beach 2013
Series: California State University, Long Beach.; Master's thesis collection, Dept. of Biological Sciences.
Edition/Format:   Thesis/dissertation : Thesis/dissertation   Computer File : English
Summary:
Abstract: The plant hormone auxin plays a major role in shaping plant morphology and development, but the gene networks regulating its synthesis and transport are incompletely known. The maize BARREN INFLORESCENCE 1 (BIF1) gene has recently been cloned and shown to play an important role in the early stages of polar auxin transport. Auxin is synthesized in shoot tips and transported basipetally through the plant  Read more...
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Genre/Form: Academic theses
Material Type: Thesis/dissertation, Internet resource
Document Type: Book, Computer File, Internet Resource
All Authors / Contributors: Robert Joseph Child
ISBN: 9781303795770 1303795779
OCLC Number: 1018406666
Description: 2, xiii, 64 leaves : color illustrations, charts
Series Title: California State University, Long Beach.; Master's thesis collection, Dept. of Biological Sciences.
Responsibility: by Robert Joseph Child.

Abstract:

Abstract: The plant hormone auxin plays a major role in shaping plant morphology and development, but the gene networks regulating its synthesis and transport are incompletely known. The maize BARREN INFLORESCENCE 1 (BIF1) gene has recently been cloned and shown to play an important role in the early stages of polar auxin transport. Auxin is synthesized in shoot tips and transported basipetally through the plant shoot and acts as a morphogen by facilitating the degradation of transcriptional repressors in a concentration dependent manner. The AUX/IAA gene family encodes transcriptional repressors that regulate a subset of plant developmental responses governed by the transcription of early auxin inducible genes in plants. Although the maize BIF1 gene is a member of the AUX/IAA gene family, the co-ortholog(s) of BIF1 in Arabidopsis thaliana was not known prior to this research. Bayesian phylogenetic reconstruction placed maize BIF1 in a clade sister to Arabidopsis thaliana AtIAA15 . The BIF1 lineage has undergone two gene duplications since the divergence of the early grasses. Molecular evolutionary analyses by maximum likelihood suggest that the BIF1 alignment is under strong purifying selection with positive selection acting on a glutamine residue located in a functional region associated with AUX/IAA protein dimerization in one clade of BIF1 paralogs, the BIF1-Like2 (BIF1L2) clade. A character reconstruction analysis using maximum parsimony estimated an adenine to cytosine transversion at the base of the BIF1L2 clade changed a glutamine into an alanine residue in this functional region. Expression of BIF1 orthologs is conserved in floral meristems in the eudicot AtIAA15 clade containing the taxa Erianthe Guttata, Arabidopsis thaliana, Medicago truncatula, however grass BIF1L2 expression has diverged within the PACMAD - BEP clade, specifically in rice, where BIF1L2 expression is reported to have moved into root tissue. These results suggest that BIF1 paralogs has changed following a second round of gene duplication in the grasses. Taken together, a change in localized expression in these sequences, and positive selection acting on a glutamine-rich region of the protein-protein binding motif could imply that BARREN INFLORESCENCE1-like2 proteins are probably interacting with a new set or subset of AUXIN RESPONSE FACTOR (ARF) binding partners, and that neofunctionalization has occurred in the BARREN INFLORESCENCE1-like2 clade.

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