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Background  NAC transcription factors (TFs) are plant-specific proteins encoded by a large gene family. They play important roles in diverse biological processes, such as plant growth and development, leaf senescence, and responses to biotic or abiotic stresses. Functions of a number of NAC TFs have been identified mainly in model plants. However, very few studies on NAC TFs have been conducted in the fruit tree of kiwifruit.    Results  Genome-wide  NAC  genes were identified and their phylogeny, genomic structure, chromosomal location, synteny relationships, protein properties and conserved motifs were analyzed. In addition, the fruit developmental process was evaluated in a new kiwifruit cultivar of  Actinidia eriantha  ‘Ganlu 1’. And expressions for all those  NAC  genes were analyzed by quantitative real-time PCR method in fruits of ‘Ganlu 1’ during its developmental process. Our research identified 142 NAC TFs which could be phylogenetically divided into 23 protein subfamilies. The genomic structures of those  NAC  genes indicated that their exons were between one and ten. Analysis of chromosomal locations suggested that 116 out of 142  NAC s distributed on all the 29 kiwifruit chromosomes. In addition, genome-wide gene expression analysis showed that expressions of 125 out of 142  NAC  genes could be detected in fruit samples.    Conclusion  Our comprehensive study provides novel information on  NAC  genes and expression patterns in kiwifruit fruit. This research would be helpful for future functional identification of  NAC  genes involved in kiwifruit fruit development.

Genome-wide identification and comprehensive analysis of NAC family genes involved in fruit development in kiwifruit (Actinidia)