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Volatile metabolome and floral transcriptome analyses reveal the volatile components of strongly fragrant progeny of Malus x robusta

文献类型： 外文期刊

作者： Li, Guofang 1 ; Liu, Jia 1 ; Zhang, He 1 ; Jia, Linguang 2 ; Liu, Youxian 1 ; Li, Jiuyang 1 ; Zhou, Shiwei 1 ; Wang, Pengjuan 1 ; Tan, Ming 1 ; Shao, Jianzhu 1 ;

作者机构： 1.Hebei Agr Univ, Coll Hort, Baoding, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Changli Inst Pomol, Changli, Peoples R China

关键词： floral fragrance; volatile components; linalool; methyl benzoate; leaf acetate; methyl anthranilate; transcriptome

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2023 年 14 卷

页码：

收录情况： SCI

摘要： Floral fragrance is an important trait that contributes to the ornamental properties and pollination of crabapple. However, research on the physiological and molecular biology of the floral volatile compounds of crabapple is rarely reported. In this study, metabolomic and transcriptomic analyses of the floral volatile compounds of standard Malus robusta flowers (Mr), and progeny with strongly and weakly fragrant flowers (SF and WF, respectively), were conducted. Fifty-six floral volatile compounds were detected in the plant materials, mainly comprising phenylpropane/benzene ring-type compounds, fatty acid derivatives, and terpene compounds. The volatile contents were significantly increased before the early flowering stage (ES), and the contents of SF flowers were twice those of WF and Mr flowers. Odor activity values were determined for known fragrant volatiles and 10-11 key fragrant volatiles were identified at the ES. The predominant fragrant volatiles were methyl benzoate, linalool, leaf acetate, and methyl anthranilate. In the petals, stamens, pistil, and calyx of SF flowers, 26 volatiles were detected at the ES, among which phenylpropane/benzene ring-type compounds were the main components accounting for more than 75% of the total volatile content. Functional analysis of transcriptome data revealed that the phenylpropanoid biosynthesis pathway was significantly enriched in SF flowers. By conducting combined analyses between volatiles and differentially expressed genes, transcripts of six floral scent-related genes were identified and were associated with the contents of the key fragrant volatiles, and other 23 genes were potentially correlated with the key volatile compounds. The results reveal possible mechanisms for the emission of strong fragrance by SF flowers, and provide a foundation for improvement of the floral fragrance and development of new crabapple cultivars.

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