衰老
己醛
绿叶挥发物
萜类
风味
新陈代谢
生物
美拉德反应
苯丙素
固相微萃取
化学
植物
气相色谱-质谱法
食品科学
基因
生物化学
生物合成
质谱法
食草动物
色谱法
细胞生物学
作者
Lichao Wen,Jianmin Cao,Wei Li,Yongfeng Guo
摘要
Abstract BACKGROUND Volatile organic compounds are critical for food flavor and play important roles in plant–plant interactions and plants' communications with the environment. Tobacco is well‐studied for secondary metabolism and most of the typical flavor substances in tobacco leaves are generated at the mature stage of leaf development. However, the changes in volatiles during leaf senescence are rarely studied. RESULTS The volatile composition of tobacco leaves at different stages of senescence was characterized for the first time. Comparative volatile profiling of tobacco leaves at different stages was performed using solid‐phase microextraction coupled with gas chromatography/mass spectrometry. In total, 45 volatile compounds were identified and quantified, including terpenoids, green leaf volatiles (GLVs), phenylpropanoids, Maillard reaction products, esters, and alkanes. Most of the volatile compounds showed differential accumulation during leaf senescence. Some terpenoids, including neophytadiene, β ‐springene, and 6‐methyl‐5‐hepten‐2‐one, increased significantly with the progress of leaf senescence. Hexanal and phenylacetaldehyde also showed increased accumulation in leaves during senescence. The results from gene expression profiling indicated that genes involved in metabolism of terpenoids, phenylpropanoids, and GLVs were differentially expressed during leaf yellowing. CONCLUSION Dynamic changes in volatile compounds during tobacco leaf senescence are observed and the integration of gene‐metabolites datasets offers important readouts for the genetic control of volatile production during the process of leaf senescence. © 2023 Society of Chemical Industry.
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