Brassinosteroid-related transcription factor BIL1/BZR1 increases plant resistance to insect feeding

The plant steroid hormones brassinosteroids (BRs) play important roles in plant growth and responses to stresses. The up-regulation of pathogen resistance by BR signaling has been analyzed, but the relationship between BR and insect herbivores remains largely unclear. BIL1/BZR1 is a BR master transc...

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Bibliographic Details
Published in:Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2014-06, Vol.78 (6), p.960-968
Main Authors: Miyaji, Tomoko, Yamagami, Ayumi, Kume, Nao, Sakuta, Masaaki, Osada, Hiroyuki, Asami, Tadao, Arimoto, Yutaka, Nakano, Takeshi
Format: Article
Language:English
Subjects:
Animals
Arabidopsis - cytology
Arabidopsis - genetics
Arabidopsis - physiology
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
BIL1/BZR1
brassinosteroid
Brassinosteroids - metabolism
Herbivory
jasmonate
Loteae - cytology
Loteae - genetics
Loteae - physiology
Mutation
Nuclear Proteins - genetics
Nuclear Proteins - metabolism
onion thrips
Phenotype
Plant Leaves - cytology
Plant Leaves - genetics
Plants, Genetically Modified
Signal Transduction
signaling
Thysanoptera
Transcription Factors - genetics
Transcription Factors - metabolism
Transformation, Genetic
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Summary:The plant steroid hormones brassinosteroids (BRs) play important roles in plant growth and responses to stresses. The up-regulation of pathogen resistance by BR signaling has been analyzed, but the relationship between BR and insect herbivores remains largely unclear. BIL1/BZR1 is a BR master transcription factor known to be involved in the regulation of plant development through work conducted on a gain of function mutation. Here, we analyzed the function of BIL1/BZR1 in response to insect feeding and demonstrated that resistance against thrip feeding was increased in the bil1-1D/bzr1-1D mutant compared to wild-type. We generated Lotus japonicus transgenic plants that over-express the Arabidopsis bil1/bzr1 mutant, Lj-bil1/bzr1-OX. The Lj-bil1/bzr1-OX plants showed increased resistance to thrip feeding. The expression levels of the jasmoninc acid (JA)-inducible VSP genes were increased in both Arabidopsis bil1-1D/bzr1-1D mutants and L. japonicus Lj-bil1/bzr1-OX plants. The resistance to thrip feeding caused by the BIL1/BZR1 gene may involve JA signaling. Over-Expression mutated bil1/bzr1 that is brassinosteroid master transcription factor gives resistance against the thrips feeding to plants.
ISSN:0916-8451
1347-6947
DOI:10.1080/09168451.2014.910093