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Article|01 Mar 2021|OPEN
The chromosome-based lavender genome provides new insights into Lamiaceae evolution and terpenoid biosynthesis
Jingrui Li1,2, Yiming Wang3, Yanmei Dong1,2, Wenying Zhang1,2, Di Wang1, Hongtong Bai1, Kui Li3,, Hui Li1, & Lei Shi1,
1Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Xiangshan 100093 Beijing, China
2University of Chinese Academy of Sciences, 100015 Beijing, China
3Novogene Bioinformatics Institute, 100083 Beijing, China

Horticulture Research 8,
Article number: 53 (2021)
doi: 10.1038/hortres.2021.53
Views: 321

Received: 25 Sep 2020
Revised: 23 Dec 2020
Accepted: 29 Dec 2020
Published online: 01 Mar 2021

Abstract

The aromatic shrub Lavandula angustifolia produces various volatile terpenoids that serve as resources for essential oils and function in plant-insect communication. To better understand the genetic basis of the terpenoid diversity in lavender, we present a high-quality reference genome for the Chinese lavender cultivar “Jingxun 2” using PacBio and Hi-C technologies to anchor the 894.50 Mb genome assembly into 27 pseudochromosomes. In addition to the γ triplication event, lavender underwent two rounds of whole-genome duplication (WGD) during the Eocene–Oligocene (29.6 MYA) and Miocene–Pliocene (6.9 MYA) transitions. As a result of tandem duplications and lineage-specific WGDs, gene families related to terpenoid biosynthesis in lavender are substantially expanded compared to those of five other species in Lamiaceae. Many terpenoid biosynthesis transcripts are abundant in glandular trichomes. We further integrated the contents of ecologically functional terpenoids and coexpressed terpenoid biosynthetic genes to construct terpenoid-gene networks. Typical gene clusters, including TPS-TPS, TPS-CYP450, and TPS-BAHD, linked with compounds that primarily function as attractants or repellents, were identified by their similar patterns of change during flower development or in response to methyl jasmonate. Comprehensive analysis of the genetic basis of the production of volatiles in lavender could serve as a foundation for future research into lavender evolution, phytochemistry, and ecology.