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BTF3 has been recognized to be involved in plant growth and development. But its function remains mostly unknown during seed germination and seedling stage. Here, we have analyzed OsBTF3-related sequences in  Oryza sativa  L. subspecies, japonica, which resembles with the conserved domain of a nascent polypeptide associated complex (NAC) with different homologs of OsBTF3 and human BTF3. Inhibition of  Osj10gBTF3  has led to considerable morphological changes during seed germination and seedling growth. Germination percentage was not influenced by the application of GA 3 , ABA, and NaCl but all concentrations caused wild-type (WT) seeds to germinate more rapidly than the RNAi ( Osj10gBTF3   Ri ) transgenic lines. Seedling inhibition was more severe in the  Osj10gBTF3   Ri  seedlings compared with their WT especially when treated with 100 or 200  μ M GA 3 ; 50% reduction in shoots was observed in  Osj10gBTF3   Ri  seedlings. The expression of  Osj3g1BTF3 ,  Osj3g2BTF3  and  Osj10gBTF3  was primarily constitutive and generally modulated by NaCl, ABA, and GA 3  stresses in both  Osj10gBTF3   Ri  lines and WT at the early seedling stage, suggesting that  Osj3g1BTF3  and  Osj10gBTF3  are much similar but different from  Osj3g2BTF3  in biological function. These results show that OsBTF3 plays an important role in seed germination and seedling growth gives a new perception demonstrating that more multifaceted regulatory functions are linked with BTF3 in plants.

Basal Transcription Factor 3 Plays an Important Role in Seed Germination and Seedling Growth of Rice