JAmyb,OsJAmyb,OsMYB21

| Categories genes  | Tags root  transcription factor  growth  jasmonate  disease  seedling  salinity  homeostasis  seed  seed germination  salinity stress  abiotic stress  defense  seedlings  leaf  resistance  panicle  blast  lesion  blight  bacterial blight  breeding 
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    • JAmyb overexpression in transgenic Arabidopsis improved tolerance to high-salinity stress during seed germination, seedling growth, and root elongation
    • In this study, we identified a rice R2R3-type MYB transcription factor gene, JAmyb, as a gene whose overexpression causes tolerance to high salinity
    • Several transcription factors involved in the jasmonate (JA)-mediated stress response are also regulated by JAmyb
    • Role of the rice transcription factor JAmyb in abiotic stress response
    • JAmyb has been reported to be associated with disease response
    • In rice seedlings, JAmyb expression was induced by high-salinity and high-osmotic stresses and reactive oxygen species (ROS), suggesting that JAmyb is responsible for abiotic stress response
    • Microarray analysis showed that the overexpression of JAmyb stimulates the expression of several defense-associated genes, some of which have been predicted to be involved in osmotic adjustment, ROS removal, and ion homeostasis
    • Our observations suggest that JAmyb plays a role in JA-mediated abiotic stress response in addition to biotic stress response in rice
    • After inoculation with the blast isolate Hoku1, the expression of OsJAMyb was more rapidly and strongly induced in the seedlings of blast-resistant Heikezijing compared with that in the blast-susceptible landrace Suyunuo
    • The expression of OsJAMyb gene was detected in the root, stem, leaf, sheath, immature panicle and flowering panicle of rice, with highest expression in the leaf
    • The OsJAMyb overexpressing transgenic lines (T3 generation) in Suyunuo showed increased resistance to blast infection with less lesion number in inoculated leaves compared with non-transgenic control plants
    • The results indicate that OsJAMyb might be involved in the resistance to blast infection in rice
    • In this study we identified one MYB transcription factor gene OsJAMyb from rice landrace Heikezijing, which encodes a protein with 283 amino-acid residues belonging to R2R3-type MYB transcription factor family
    • Through combined analysis of differential expression and annotations of the predicted genes within qBBR11-4 between two sets of rice accessions selected based on haplotypes and disease phenotypes, we identified the transcription factor OsMYB21 as the candidate gene for qBBR11-4
    • Genome-Wide Association Mapping and Gene Expression Analysis Reveal the Negative Role of OsMYB21 in Regulating Bacterial Blight Resistance in Rice
    • The OsMYB21 overexpressing plants exhibited decreased resistance to bacterial blight, accompanied with down-regulation of several defense-related genes compared with the wild-type plants
    • Conclusion: The results suggest that OsMYB21 negatively regulates bacterial blight resistance in rice, and this gene can be a promising target in rice breeding by using the gene editing method
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