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BnSIP1-1  is a trihelix transcription factor family gene which functions in abiotic stress response and abscisic acid (ABA) signaling during seed germination and seedling growth of  Brassica napus . In the present study, further sequence analysis and phenotype identification indicated that this gene had roles in light regulation and flowering of reproductive growth stage. Many phytohormones responsive  cis -acting elements, including TC-rich repeats, GARE-motif, and TCA and TGA elements, were identified in the promoter sequence of  BnSIP1-1 . The expression of  BnSIP1-1  was regulated by light period and remarkable higher expression level of  BnSIP1-1  was detected in roots than in leaves. Overexpression of  BnSIP1-1  in  Arabidopsis  delayed flowering time for 3–5 days in transgenic plants. In addition, we also found  BnSIP1-1  can respond to abiotic and ABA stress (treated with 200 mM NaCl, 300 mM mannitol or 50 μM ABA for 0, 1, 6, and 24 h) in  B. napus  through adjusting not only ABA but also other endogenous hormones, including indole-3-acetic acid and salicylic acid. Moreover, jasmonates (JA) signaling pathway was found not involving in the pathway of  BnSIP1-1  responding to abiotic stresses.

BnSIP1-1 Involves in Light Response and Regulation of Endogenous Hormones and Flowering Time of Brassica Napus