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Genetic analysis of the Arabidopsis TIR1/AFB auxin receptors reveals both overlapping and specialized functions

by Bennett, Malcolm J , Szutu, Whitnie , Platre, Matthieu , Bhosale, Rahul Arvind , Prigge, Michael J , Kadakia, Nikita , Busch, Wolfgang , Zhang, Yi , Pandey, Bipin Kumar , Greenham, Kathleen , Estelle, Mark

in Abortion / Analysis / Arabidopsis / Arabidopsis - genetics / Arabidopsis - metabolism / Arabidopsis Proteins - genetics / Arabidopsis Proteins - physiology / Arabidopsis thaliana / auxin / Characterization / Developmental Biology / Embryo / Embryos / Evolution / F-Box Proteins - genetics / F-Box Proteins - physiology / Flowers & plants / Genes / Genetic analysis / Genetic aspects / Genetic research / Genomes / Genomics / Gravitropism / Hormones / Life Sciences / Localization / Mutants / Phylogenetics / plant / Plant Biology / plant development / plant hormone / Plant Proteins - genetics / Plant Proteins - physiology / Proteins / Receptors, Cell Surface - genetics / Receptors, Cell Surface - physiology / Seeds

2020

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Genetic analysis of the Arabidopsis TIR1/AFB auxin receptors reveals both overlapping and specialized functions

2020

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Genetic analysis of the Arabidopsis TIR1/AFB auxin receptors reveals both overlapping and specialized functions

2020

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Journal Article

Genetic analysis of the Arabidopsis TIR1/AFB auxin receptors reveals both overlapping and specialized functions

Bennett, Malcolm J,

Szutu, Whitnie,

Platre, Matthieu,

Bhosale, Rahul Arvind,

Prigge, Michael J,

Kadakia, Nikita,

Busch, Wolfgang,

Zhang, Yi,

Pandey, Bipin Kumar,

Greenham, Kathleen,

Estelle, Mark

2020

Overview

The TIR1/AFB auxin co-receptors mediate diverse responses to the plant hormone auxin. The Arabidopsis genome encodes six TIR1/AFB proteins representing three of the four clades that were established prior to angiosperm radiation. To determine the role of these proteins in plant development we performed an extensive genetic analysis involving the generation and characterization of all possible multiply-mutant lines. We find that loss of all six TIR1/AFB proteins results in early embryo defects and eventually seed abortion, and yet a single wild-type allele of TIR1 or AFB2 is sufficient to support growth throughout development. Our analysis reveals extensive functional overlap between even the most distantly related TIR1/AFB genes except for AFB1. Surprisingly, AFB1 has a specialized function in rapid auxin-dependent inhibition of root growth and early phase of root gravitropism. This activity may be related to a difference in subcellular localization compared to the other members of the family.

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Publisher

eLife Science Publications, Ltd,eLife Sciences Publications Ltd,eLife Sciences Publication,eLife Sciences Publications, Ltd

Subject

Abortion

/ Analysis

/ Arabidopsis

/ Arabidopsis - genetics

/ Arabidopsis - metabolism

/ Arabidopsis Proteins - genetics

/ Arabidopsis Proteins - physiology