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Development of synthetic vrn2-null hexaploid wheat. a Introgression of vrn-A2 and vrn-B2 in the tetraploid cultivar Kronos. b Production of synthetic aneuploid to introgress vrn-D2, self-pollination to recover chromosome number. c Backcross with winter hexaploid wheat to produce a segregating line for vrn-A2, vrn-B2 and vrn-D2 in a winter background. X represents a crossing step, arrow represents a progeny. Non-functional VRN2 alleles are underlined
