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The jasmine (Jasminum sambac) genome and flower fragrances

By Gang Chen, Salma Mostafa, Zhaogeng Lu, Ran Du, Jiawen Cui, Yun Wang, Qinggang Liao, Jinkai Lu, Xinyu Mao, Bang Chang, Li Wang, Zhichao Jia, Xiulian Yang, Yingfang Zhu, Jianbin Yan, Biao Jin

Posted 18 Dec 2020
bioRxiv DOI: 10.1101/2020.12.17.420646

Jasminum sambac, a world-renowned plant appreciated for its exceptional flower fragrance, is of cultural and economic importance. However, the genetic basis of its fragrance is largely unknown. Here, we present the first de novo genome of J. sambac with 550.12 Mb (scaffold N50 = 40.1 Mb) assembled into 13 pseudochromosomes. Terpene synthase genes associated with flower fragrance are significantly amplified in the form of gene clusters through tandem duplications in the genome. Eleven homolog genes within the SABATH super-family were identified as related to phenylpropanoid/benzenoid compounds. Several key genes regulating jasmonate biosynthesis were duplicated causing increased copy numbers. Furthermore, multi-omics analyses identified various aromatic compounds and the key genes involved in fragrance biosynthesis pathways. Our genome of J. sambac offers a basic genetic resource for studying floral scent biosynthesis and provides an essential foundation for functional genomic research and variety improvements in Jasminum.

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