| Gene Symbold |
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Class
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Level 1
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Response to Vernalization
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Level 2
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Level 3
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Level 4
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Symbol
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Wild Type
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Vrn-2
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Allele
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Comment
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Orthologous series in chromosomes of homoeologous group 4. Vrn-Am2 was located in T. monococcum {279} on chromosome 5Am on the 4Am translocated region. Vrn-Am2 was mapped to the distally located Xwg114-5A - Xwec87-5A region {0312}. Vrn-H2(sh/sgh1) occurs in barley chromosome 4H {1455} and is probably orthologous to Vrn-Am2 based on comparative maps {279,767}. Vrn-2 is a zinc-finger/CCT domain transcription factor (ZCCT1) {10299}, and repressor of flowering down-regulated by vernalization and short days {10301}. Reduction of Vrn-2 transcripts in transgenic hexaploid winter wheat accelerates flowering {10299}. A triple Vrn2 mutant (PI 676269), synthetic vrn2-null) is available in hexaploid wheat combining the non-functional vrn-A2 allele present in most polyploid wheats with a Vrn-B2 deletion from tetraploid wheat, and a non-functional vrn-D2 allele from Ae. tauschii {11124}.
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