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BMC Plant Biol

Title:		Formation mechanism of glandular trichomes involved in the synthesis and storage of terpenoids in lavender
Author(s):		Zhang Y; Wang D; Li H; Bai H; Sun M; Shi L;
Address:		"Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. China National Botanical Garden, Beijing, 100093, China. University of Chinese Academy of Sciences, Beijing, 100049, China. Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. sunmeiyu@ibcas.ac.cn. China National Botanical Garden, Beijing, 100093, China. sunmeiyu@ibcas.ac.cn. Key Laboratory of Plant Resources, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China. shilei@ibcas.ac.cn. China National Botanical Garden, Beijing, 100093, China. shilei@ibcas.ac.cn"
Journal Title:		BMC Plant Biol
Year:		2023
Volume:		20230608
Issue:		1
Page Number:		307 -
DOI:		10.1186/s12870-023-04275-y
ISSN/ISBN:		1471-2229 (Electronic) 1471-2229 (Linking)
Abstract:		"BACKGROUND: Lavender (genus Lavandula, family Lamiaceae) is an aromatic plant widely grown as an ornamental plant. The chemical composition of lavender is characterized by monoterpenoids, sesquiterpenoids, and other compounds, which are primarily synthesized and stored in epidermal secretory structures called glandular trichomes (GTs). Volatile organic compounds (VOCs) are responsible for the aroma characteristics of plant oil that drive consumer preference. Aroma is usually regarded as a characteristic trait for the classification of aromatic plants. Interestingly, VOCs are synthesized and stored in GTs. Lamiaceae species such as purple perilla, peppermint, basil, thyme, and oregano usually possess two types of GTs: peltate glandular trichomes (PGTs) and capitate glandular trichomes (CGTs). But the development process of PGTs in lavender has been reported in only a few studies to date. RESULTS: In this study, we identified and quantified the VOCs in four lavender cultivars by headspace-solid phase micro extraction-gas chromatography mass spectrometry (HS-SPME-GC-MS). A total of 66 VOCs were identified in these four cultivars, the most prominent of which were linalyl acetate and linalool, and flowers were the main site of accumulation of these VOCs. Here, we examined the developmental process of PGTs, including the formation of their base, body, and apex. The apex cells contained secretory cavities, which produced VOCs. Based on the reference genome sequence of the lavender cultivar 'Jingxun 2', several R2R3-MYB subfamily genes related to GT formation were identified. These results will guide the engineering of GTs and molecular breeding of lavender for improving the VOC content. CONCLUSIONS: In this study, we identified the VOCs in four lavender cultivars. We analyzed the formation of GTs, and compared the number and diameter size of PGTs among four lavender cultivars. Additionally, we identified four candidate genes belonging to the R2R3-MYB family"
Keywords:		"Terpenes *Lavandula/genetics *Oils, Volatile/analysis Trichomes/chemistry Plant Oils/chemistry Formation mechanism Glandular trichomes (GTs) Lavender Volatile organic compounds (VOCs);"
Notes:		"MedlineZhang, Yanan Wang, Di Li, Hui Bai, Hongtong Sun, Meiyu Shi, Lei eng XDA23080603/Strategic Priority Research Program of the Chinese Academy of Sciences/ England 2023/06/09 BMC Plant Biol. 2023 Jun 8; 23(1):307. doi: 10.1186/s12870-023-04275-y"