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Background  Plant height is one of the most important agronomic traits in many crops due to its influence on lodging resistance and yield performance. Although progress has been made in the use of dwarfing genes in crop improvement, identification of new dwarf germplasm is still of significant interest for breeding varieties with increased yield.    Results  Here we describe a dominant, dwarf mutant G7 of  Brassica napus  with down-curved leaves derived from tissue culture. To explore the genetic variation responsible for the dwarf phenotype, the mutant was crossed to a conventional line to develop a segregating F 2  population. Bulks were formed from plants with either dwarf or conventional plant height and subjected to high throughput sequencing analysis via mutation mapping (MutMap). The dwarf mutation was mapped to a 0.6 Mb interval of  B. napus  chromosome C05. Candidate gene analysis revealed that one SNP causing an amino acid change in the domain II of  Bna . IAA7.C05  may contribute to the dwarf phenotype. This is consistent with the phenotype of a gain-of-function  indole-3-acetic acid  ( iaa ) mutant in  Bna . IAA7.C05  reported recently. GO and KEGG analysis of RNA-seq data revealed the down-regulation of auxin related genes, including many other  IAA  and  small up regulated response  ( SAUR ) genes, in the dwarf mutant.    Conclusion  Our studies characterize a new allele of  Bna . IAA7.C05  responsible for the dwarf mutant generated from tissue culture. This may provide a valuable genetic resource for breeding for lodging resistance and compact plant stature in  B. napus .

Identification of Bna.IAA7.C05 as allelic gene for dwarf mutant generated from tissue culture in oilseed rape