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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (6): 57-73.doi: 10.11707/j.1001-7488.LYKX20220209

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Analysis of Volatile Organic Compounds in Walnut Leaves at Different Growth Stages with GC-IMS

Ru Wang1,3,Shasha Luo1,3,Ruyue Wang1,3,Mengsi Yang1,3,Yali Sun2,Haifang Hu2,*(),Ping Zhang1   

  1. 1. Xinjiang Agricultural University Urumqi 83005
    2. Xinjiang Academy of Forestry Sciences Urumqi 830062
    3. Long-Term Scientific Research Base of Pectology in Xinjiang Jiamu Urumqi 843100
  • Received:2022-04-01 Online:2023-06-25 Published:2023-08-08
  • Contact: Haifang Hu E-mail:43784936@qq.com

Abstract:

Objective: This study aims to explore the characteristics of volatile organic compounds (VOCs) in the leaves of different walnut cultivars at different growth stages, clarify the VOCs components and compare the variation in the VOCs components at different growth stages to establish the odor fingerprints of volatile organic compounds in walnut leaves at different development stages, so as to provide reference for the utilization of walnut leaf germplasm resources. Method: Gas chromatography-ion mobility spectrometry (GC-IMS) was used to detect the volatile components in the leaves of 8 walnut varieties at 4 different growth stages (May, June, July and August). Two-dimensional GC-IMS spectrum, fingerprint and principal component analysis (PCA) were applied to compare the volatile components of walnut leaves at different growth stages. Result: A total of 102 volatile components were detected by GC-IMS in the leaves of 8 walnut varieties at 4 growth stages, including 12 terpenes, 30 esters, 24 aldehydes, 19 alcohols, 9 ketones and 8 others. Among them, 32 volatile substances were detected in walnut leaves in May, June, July and August, including aromatic alcohols, nonanal, cineolol, cineolol dimer, ethyl hexanoate, ethyl hexanoate dimer, amyl acetate, ethanol, 2-hexenal, hexanal, heptanal, ethyl isobutyrate, ethyl propionate, 2-methylbutyraldehyde, isovaleraldehyde, ethyl acetate, ethanol, ethyl isovalerate, 3-methyl-1-pentanol, 1-pentanol, hexyl butyrate and propyl butyrate. The developmental degree of walnut leaves had a great effect on its volatile components. The total content of volatile compounds in Juglansregia‘Wen185’, J. regia‘Xinxin2’, J. regia‘Zhipi’, J. regia‘Robert Liver-more’ and J. regia‘Zijin’ first increased and then decreased from May to August, and reached the highest in June. The total content of volatile compounds in Carya cathayensis, J. nigra and J. microcarpa had an upward trend from May to July, and then a downward trend from July to August with the highest in July. The types and contents of volatile substances in walnut leaves changed obviously at different growth stages and some volatile substances decreased gradually with the development of walnut leaves. Conclusion: There is a little difference in the species of volatile components in walnut leaves at different growth periods, but the relative content is very different. Terpenes and esters first increase and then decrease with the development of walnut leaves, while alcohols first decrease and then increase with the change of growth period. The research results can provide reference for utilizing walnut leaf germplasm resources.

Key words: gas chromatography-ion mobility spectrometry (GC-IMS), fingerprint, volatile substances, walnut leaves

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