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Background  WRKY DNA-binding protein (WRKY) is a large gene family involved in plant responses and adaptation to salt, drought, cold and heat stresses. Sweet potato from the genus  Ipomoea  is a staple food crop, but the  WRKY  genes in  Ipomoea  species remain unknown to date. Hence, we carried out a genome-wide analysis of  WRKYs  in  Ipomoea trifida  (H.B.K.) G. Don. ,  the wild ancestor of sweet potato.    Results  A total of 83  WRKY  genes encoding 96 proteins were identified in  I. trifida , and their gene distribution, duplication, structure, phylogeny and expression patterns were studied.  ItfWRKYs  were distributed on 15 chromosomes of  I. trifida . Gene duplication analysis showed that segmental duplication played an important role in the  WRKY  gene family expansion in  I. trifida.  Gene structure analysis showed that the intron-exon model of the  ItfWRKY  gene was highly conserved. Meanwhile, the ItfWRKYs were divided into five groups (I, IIa + IIb, IIc, IId + IIe and III) on the basis of the phylogenetic analysis on  I. trifida  and  Arabidopsis thaliana WRKY  proteins. In addition, gene expression profiles confirmed by quantitative polymerase chain reaction showed that  ItfWRKY s were highly up-regulated or down-regulated under salt, drought, cold and heat stress conditions, implying that these genes play important roles in response and adaptation to abiotic stresses .Conclusions  In summary, genome-wide identification, gene structure, phylogeny and expression analysis of  WRKY  gene in  I. trifida  provide basic information for further functional studies of  ItfWRKYs  and for the molecular breeding of sweet potato.

bmc genomic data

Genome-wide identification, characterisation and functional evaluation of WRKY genes in the sweet potato wild ancestor Ipomoea trifida (H.B.K.) G. Don. under abiotic stresses