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Background  Correct timing of flowering is critical for plants to produce enough viable offspring. In  Arabidopsis thaliana  (Arabidopsis), flowering time is regulated by an intricate network of molecular signaling pathways. Arabidopsis  srr1–1  mutants lacking SENSITIVITY TO RED LIGHT REDUCED 1 (SRR1) expression flower early, particularly under short day (SD) conditions (1). SRR1 ensures that plants do not flower prematurely in such non-inductive conditions by controlling repression of the key florigen  FT . Here, we have examined the role of SRR1 in the closely related crop species  Brassica napus.Results  Arabidopsis SRR1 has five homologs in  Brassica napus.  They can be divided into two groups, where the A02 and C02 copies show high similarity to AtSRR1 on the protein level. The other group, including the A03, A10 and C09 copies all carry a larger deletion in the amino acid sequence. Three of the homologs are expressed at detectable levels:  A02 ,  C02  and  C09 . Notably, the gene copies show a differential expression pattern between spring and winter type accessions of  B. napus . When the three expressed gene copies were introduced into the  srr1–1  background, only  A02  and  C02  were able to complement the  srr1–1  early flowering phenotype, while  C09  could not. Transcriptional analysis of known SRR1 targets in  Bna.SRR1 -transformed lines showed that  CYCLING DOF FACTOR 1 (CDF1)  expression is key for flowering time control via SRR1.    Conclusions  We observed subfunctionalization of the  B. napus SRR1  gene copies, with differential expression between early and late flowering accessions of some  Bna.SRR1  copies. This suggests involvement of  Bna . SRR1  in regulation of seasonal flowering in  B. napus . The  C09  gene copy was unable to complement  srr1–1  plants, but is highly expressed in  B. napus , suggesting specialization of a particular function. Furthermore, the C09 protein carries a deletion which may pinpoint a key region of the SRR1 protein potentially important for its molecular function. This is important evidence of functional domain annotation in the highly conserved but unique SRR1 amino acid sequence.    Electronic supplementary material  The online version of this article (10.1186/s12870-019-1973-x) contains supplementary material, which is available to authorized users.

Different copies of SENSITIVITY TO RED LIGHT REDUCED 1 show strong subfunctionalization in Brassica napus