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Plant hormone abscisic acid (ABA) plays a crucial role in modulating plant responses to environmental stresses. Basic helix-loop-helix (bHLH) transcription factors are one of the largest transcription factor families that regulate multiple aspects of plant growth and development, as well as of plant metabolism in Arabidopsis. Several bHLH transcription factors have been shown to be involved in the regulation of ABA signaling. We report here the characterization of bHLH129, a bHLH transcription factor in Arabidopsis. We found that the expression level of  bHLH129  was reduced in response to exogenously applied ABA, and elevated in the ABA biosynthesis mutant  aba1-5 . Florescence observation of transgenic plants expressing  bHLH129-GFP  showed that bHLH129 was localized in the nucleus, and transient expression of  bHLH129  in protoplasts inhibited reporter gene expression. When expressed in Arabidopsis under the control of the  35S  promoter,  bHLH129  promoted root elongation, and the transgenic plants were less sensitivity to ABA in root elongation assays. Quantitative RT-PCR results showed that ABA response of several genes involved in ABA signaling, including  ABI1 ,  SnRK2.2 ,  SnRK2.3  and  SnRK2.6  were altered in the transgenic plants overexpressing  bHLH129.  Taken together, our study suggests that bHLH129 is a transcription repressor that negatively regulates ABA response in Arabidopsis.

An ABA down-regulated bHLH transcription repressor gene, bHLH129 regulates root elongation and ABA response when overexpressed in Arabidopsis