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Background  Many transcription factors (TFs), such as those in the basic helix-loop-helix (bHLH) family, are important for regulating plant growth and plant responses to abiotic stress. The expression of  OsbHLH035  is induced by drought and salinity. However, its functional role in rice growth, development, and the salt response is still unknown.    Results  The bHLH TF  OsbHLH035  is a salt-induced gene that is primarily expressed in germinating seeds and seedlings. Stable expression of GFP-fused OsbHLH035 in rice transgenic plants revealed that this protein is predominantly localized to the nucleus.  Osbhlh035  mutants show delayed seed germination, particularly under salt-stress conditions. In parallel, abscisic acid (ABA) contents are over-accumulated, and the expression of the ABA biosynthetic genes  OsABA2  and  OsAAO3  is upregulated; furthermore, compared with that in wild-type (WT) seedlings, the salt-induced expression of  OsABA8ox1 , an ABA catabolic gene, in germinating  Osbhlh035  mutant seeds is downregulated. Moreover,  Osbhlh035  mutant seedlings are unable to recover from salt-stress treatment. Consistently, sodium is over-accumulated in aerial tissues but slightly reduced in terrestrial tissues from  Osbhlh035  seedlings after salt treatment. Additionally, the expression of the sodium transporters  OsHKT1;3  and  1;5  is reduced in  Osbhlh035  aerial and terrestrial tissues, respectively. Furthermore, genetic complementation can restore both the delayed seed germination and the impaired recovery of salt-treated  Osbhlh035  seedlings to normal growth.    Conclusion  OsbHLH035 mediates seed germination and seedling recovery after salt stress relief through the ABA-dependent and ABA-independent activation of  OsHKT  pathways, respectively.    Electronic supplementary material  The online version of this article (10.1186/s12284-018-0244-z) contains supplementary material, which is available to authorized users.

rice

The transcription factor OsbHLH035 mediates seed germination and enables seedling recovery from salt stress through ABA-dependent and ABA-independent pathways, respectively