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DNA binding with one finger (Dof) proteins are plant-specific transcription factors with important and diverse functions in seed germination, flowering time, and biotic and abiotic stresses. In this study, haplotype-based association analysis was conducted between heading date and 30  Dof  family genes in a worldwide germplasm collection. Of these, 22  Dof  genes were associated with heading date. Multiple comparisons among haplotypes revealed their diverse functions in promoting and suppressing heading date under short-day (SD) and long-day (LD) conditions. They cumulatively made a considerable contribution to the missing heritability of heading date. A set of knockout mutants of 30  Dof  genes generated by CRISPR/Cas9-mediated genome editing technology showed that 11   and 9  Dof  genes regulated heading date under LD and SD, respectively. Phenotype measurement of mutants showed that these 11 and 9  Dof  genes slightly regulated heading with effects of 2–5 days under LD and SD, respectively. Both mutant and natural variation assays indicated functional redundancy in regulating heading date among  Dof  family genes. Nucleotide diversity analysis suggested that most  Dof  genes have been subjected to selection during domestication and improvement. Beyond heading date, this set of mutants is also a good resource for evaluating the function of  Dof  genes in regulating stress tolerance and seed germination.

Minor Effects of 11 Dof Family Genes Contribute to the Missing Heritability of Heading Date in Rice (Oryza sativa L.)