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miR828 and miR858 regulate homoeologous MYB2 gene functions in Arabidopsis trichome and cotton fibre development
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miR828 and miR858 regulate homoeologous MYB2 gene functions in Arabidopsis trichome and cotton fibre development
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Journal Article
miR828 and miR858 regulate homoeologous MYB2 gene functions in Arabidopsis trichome and cotton fibre development
2014
Overview
Although polyploidy is common in plants and some animals, mechanisms for functional divergence between homoeologous genes are poorly understood.
MYB2
gene promotes cotton fibre development and is functionally homologous to
Arabidopsis GLABROUS1
(
GL1
) in trichome formation. The most widely cultivated cotton is an allotetraploid (
Gossypium hirsutum
, AADD) that contains
GhMYB2A
and
GhMYB2D
homoeologs. Here we show that
GhMYB2D
mRNA accumulates more than
GhMYB2A
during fibre initiation and is targeted by miR828 and miR858, generating
trans
-acting siRNAs (ta-siRNAs) in the
TAS4
family. Overexpressing
GhMYB2A
but not
GhMYB2D
complements the
gl1
phenotype. Mutating the miR828-binding site or replacing its downstream sequence in
GhMYB2D
abolishes ta-siRNA production and restores trichome development in
gl1
mutants. Moreover, disrupting Dicer-like protein 4 or
RDR6
, the biogenesis genes for ta-siRNAs, in the
gl1 GhMYB2D
overexpressors restores trichome development. These data support a unique role for microRNAs in functional divergence between target homoeologous genes that are important for evolution and selection of morphological traits.
Tetraploid cotton contains two homoeologous genes
GhMYB2A
and
GhMYB2D
but their regulation is unclear. Here,
GhMYB2D
is shown to accumulate to higher levels than
GhMYB2A
during fibre initiation, and is a target of two microRNAs, generating ta-siRNAs, suggesting a role for microRNAs in the divergence of duplicate genes and fibre trait.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 38/77
/ 38/89
/ 42/41
/ 45
/ 45/23
/ 45/91
/ Arabidopsis Proteins - genetics
/ Arabidopsis Proteins - physiology
/ Cotton
/ Gene Expression Regulation, Plant - physiology
/ Genomes
/ Humanities and Social Sciences
/ Mutation
/ Plant Development - genetics
/ Plant Development - physiology
/ Polymorphism, Single Nucleotide - genetics
/ Proteins
/ Science
/ Seeds
