Genome Assembly of Docynia delavayi Provides New Insights into α-Farnesene Biosynthesis
Tian, J.; Chen, Z.; Jiang, C.; Li, S.; Yun, X.; He, C.; Wang, D.
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Docynia delavayi is an economically significant fruit species with a high market potential due to the special aroma of its fruit. Here, a 653.34 Mb high-quality genome of D. delavayi was first reported, of which 93.8% of the sequences were assembled to 17 chromosomes. A total of 48325 protein-coding genes were annotated in D. delavayi genome. Ks analysis proved that two whole genome duplication (WGD) events occurred in D. delavayi, resulting in the expansion of genes associated with terpene biosynthesis, which promoted its fruit-specific aroma production. Combined multi-omics analysis, -farnesene was detected as the most abundant aroma substance emitted by D. delavayi fruit during storage, meanwhile a -farnesene synthase gene and 15 transcription factors (TFs) potentially involved in -farnesene biosynthesis were identified. Further studies for the regulation network of -farnesene biosynthesis revealed that DdebHLH, DdeERF1 and DdeMYB could activate the transcription of DdeAFS. To our knowledge, it is the first report that MYB TF plays a regulatory role in -farnesene biosynthesis, which will greatly facilitate future breeding programs for D. delavayi.
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