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The general transcription repressor,  TaDr1  gene, was identified during screening of a wheat SNP database using the Amplifluor-like SNP marker KATU-W62. Together with two genes described earlier,  TaDr1A  and  TaDr1B , they represent a set of three homeologous genes in the wheat genome. Under drought, the total expression profiles of all three genes varied between different bread wheat cultivars. Plants of four high-yielding cultivars exposed to drought showed a 2.0–2.4-fold increase in  TaDr1  expression compared to controls. Less strong, but significant 1.3–1.8-fold up-regulation of the  TaDr1  transcript levels was observed in four low-yielding cultivars.  TaVrn1  and  TaFT1 , which controls the transition to flowering, revealed similar profiles of expression as  TaDr1 . Expression levels of all three genes were in good correlation with grain yields of evaluated cultivars growing in the field under water-limited conditions. The results could indicate the involvement of all three genes in the same regulatory pathway, where the general transcription repressor  TaDr1  may control expression of  TaVrn1  and  TaFT1  and, consequently, flowering time. The strength of these genes expression can lead to phenological changes that affect plant productivity and hence explain differences in the adaptation of the examined wheat cultivars to the dry environment of Northern and Central Kazakhstan. The Amplifluor-like SNP marker KATU-W62 used in this work can be applied to the identification of wheat cultivars differing in alleles at the  TaDr1  locus and in screening hybrids.

The General Transcription Repressor TaDr1 Is Co-expressed With TaVrn1 and TaFT1 in Bread Wheat Under Drought