Journal
JOURNAL OF PLANT RESEARCH
Volume 118, Issue 3, Pages 229-234Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s10265-005-0215-5
Keywords
gene duplication; phylogenetic relationship; SOC1/TM3-like genes; SOC1 motif; subfunctionalization; Trillium camtschatcense
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Plant MADS-box genes encode transcriptional regulators that are critical for a number of developmental processes. such as the establishment of floral organ identity, flowering time, and fruit development. It appears that the MADS-box gene family has undergone considerable gene duplication and divergence within various angiosperm lineages. SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1)/Tomato MADS-box gene 3 (TM3)-like genes are members of the MADS-box gene family and have undergone repeated duplication events. Here, we isolated and characterized the SOC1/TM3-like gene TrcMADS1 from Trillium camtschatcense (Trilliaceae) to infer the ancestral function of SOC1/TM3-like genes. The alignment of SOC1/TM3-like genes revealed the presence of a highly conserved region in the C-terminal of predicted protein sequences, designated the SOC1 motif. Phylogenetic analysis indicated that TrcMADS1 is at the basal position of the SOCI/TM3-like gene family. The TrcMADS1 mRNA was detected in both vegetative and reproductive organs by RT-PCR. Our results suggest that duplicated copies of SOC1/TM3-like gene evolved to become variously functionally specialized.
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