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Lily ( Lilium spp.) is an important cut flower around the world. Flower senescence in lilies is characterized by the wilting and abscission of tepals, which results in a decrease in flower quality and huge economic loss. However, the mechanism underlying flower senescence in lilies is largely unknown. In this study, single-molecule, real-time (SMRT) and Illumina sequencing were carried out in L  . oriental 'Siberia'. Sequencing yielded 73,218 non-redundant transcripts, with an N50 of 3792 bp. These data were further integrated with three published transcriptomes through cogent analysis, which yielded 62,960 transcripts, with an increase in N50 of 3935 bp. Analysis of differentially expressed genes showed that 319 transcription factors were highly upregulated during flower senescence. The expression of twelve NAC genes and eleven senescence-associated genes ( SAGs ) showed that LoNAC29 and LoSAG39 were highly expressed in senescent flowers. Transient overexpression of LoNAC29 and LoSAG39 in tepals of lily notably accelerated flower senescence, and the promoter activity of LoSAG39 was strongly induced by LoNAC29 . This work supported new evidence for the molecular mechanism of flower senescence and provided better sequence data for further study in lilies.

SMRT and Illumina RNA Sequencing and Characterization of a Key NAC Gene LoNAC29 during the Flower Senescence in Lilium oriental ‘Siberia’