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Volatiles and Transcriptome Profiling Revealed the Formation of 'Taro-like' Aroma in the Leaf of Pumpkin (Cucurbita moschata)

文献类型： 外文期刊

作者： Zhao, Siying 1 ; Qiu, Yuehan 1 ; Luo, Jianning 1 ; Wang, Wenwen 4 ; Wu, Haibin 1 ; Liu, Xiaoxi 1 ; Zhao, Gangjun 1 ; Gong, Hao 1 ; Zheng, Xiaoming 1 ; Zhong, Yujuan 1 ; Yang, Xian 2 ; Li, Junxing 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangdong Key Lab New Technol Res Vegetables, Guangzhou 510640, Peoples R China

2.South China Agr Univ, Coll Hort, Guangzhou 510640, Peoples R China

3.Guangdong Lab Lingnan Modern Agr, Guangzhou 510640, Peoples R China

4.Agilent Technol China Co Ltd, Beijing 100102, Peoples R China

关键词： pumpkin; 'taro-like' aroma; volatiles; transcriptome

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 11 期

页码：

收录情况： SCI

摘要： 'Taro-like' odor is an important economic trait of pumpkin species. The metabolic and molecular bases of this aromatic trait remain largely unexplored. Therefore, in this study, gas chromatography-mass spectrometry, GC-Olfactometry, and RNA-seq technology were used to illuminate the differential volatile compounds, the key volatile compounds, and differentially expressed genes (DEGs) in leaves from two pumpkin samples. Eight volatile compounds, including (E)-2-nonenal, 3-octanol, 2-ethyl-1-hexanol, 1-nonanol, oc-terpineol, 2,3-pentanedione, caryophyllene, and 2-acetyl-1-pyrroline, were only detected in the sample with 'taro-like' aroma. Moreover, the variable importance in projection scores of all the above eight volatile compounds were >1.0 using PLS-DA analysis. The compounds 2-acetyl-1-pyrroline, 3-octanol, 1-nonanol, and (E)-3,7-dimethyl-2,6-octadienal were identified as the key contributors using GC-Olfactometry analysis. It was determined that 2-acetyl-1-pyrroline might play a significant role in 'taro-like' aroma. Furthermore, most of the differential volatile compounds were derived from fatty acids, and the DEGs were also involved in the pathways related to degradation, metabolism, and biosynthesis of fatty acids. Moreover, five genes involved in the accumulation of 2-acetyl-1-pyrroline showed differential expression, and their expression trends were consistent with 2-acetyl-1-pyrroline. This study offers the basis for further studies on the mechanism of 'taro-like' aroma in pumpkins.

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