Plant disease resistance is augmented in uzu barley lines modified in the brassinosteroid receptor BRI1

Brassinosteroid hormones regulate many aspects of plant growth and development. The membrane receptor BRI1 is a central player in the brassinosteroid signaling cascade. Semi-dwarf 'uzu' barley carries a mutation in a conserved domain of the kinase tail of BRI1 and this mutant allele is rec...

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Bibliographic Details
Published in:BMC plant biology 2014-08, Vol.14 (1), p.227-227, Article 227
Main Authors: Ali, Shahin S, Gunupuru, Lokanadha R, Kumar, G B Sunil, Khan, Mojibur, Scofield, Steve, Nicholson, Paul, Doohan, Fiona M
Format: Article
Language:English
Subjects:
Analysis
Barley
Biotechnology industry
Brassinosteroids - metabolism
Computer software industry
Crop diseases
Derivatives
Disease Resistance - genetics
Experiments
Gene expression
Gene mutations
Gene Silencing
Genes
Genetic aspects
Genomes
Hordeum - physiology
Hordeum - virology
Host-Pathogen Interactions - genetics
Kinases
Mutation
Normal distribution
Plant diseases
Plant Proteins - genetics
Plasmids
Research parks
Science
Social sciences
Statistical analysis
Steroids
Tobacco
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Summary:Brassinosteroid hormones regulate many aspects of plant growth and development. The membrane receptor BRI1 is a central player in the brassinosteroid signaling cascade. Semi-dwarf 'uzu' barley carries a mutation in a conserved domain of the kinase tail of BRI1 and this mutant allele is recognised for its positive contribution to both yield and lodging resistance. Here we show that uzu barley exhibits enhanced resistance to a range of pathogens. It was due to a combination of preformed, inducible and constitutive defence responses, as determined by a combination of transcriptomic and biochemical studies. Gene expression studies were used to determine that the uzu derivatives are attenuated in downstream brassinosteroid signaling. The reduction of BRI1 RNA levels via virus-induced gene silencing compromised uzu disease resistance. The pathogen resistance of uzu derivatives may be due to pleiotropic effects of BRI1 or the cascade effects of their repressed BR signaling.
ISSN:1471-2229
1471-2229
DOI:10.1186/s12870-014-0227-1