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GC-MS method was utilized to determine the volatile components of wild Glyptostrobus pensilis leaves from six geographic distributions in Guangxi (Binyang county, Tiandeng county, Yanshan district, Cangwu county, Pingle county and Qintang district) to investigate the geographic variation patterns of volatile components in the leaves. A total of 139 chemical components were detected in the volatile components of the leaves from different geographic distributions. Terpenes α-pinene and D-limonene had relatively high contents across all geographic distributions, ranging from 18.61% to 28.32% and 16.80% to 49.02%, respectively. Qintang had the fewest volatile species, while Binyang had the most. The relative contents of alcohols, aromatic hydrocarbons, ethers, aldehydes, terpenes, ketones and esters were the lowest in Yanshan, whereas the relative contents of aromatic hydrocarbons, phenols, ethers, aldehydes, acids, terpenes and alkanes were the highest in Tiandeng. Principal component analysis (PCA) showed that the cumulative contribution rate of the first three principal components reached 97.53%, reflecting most of the component information. The absolute values of characteristic vectors for ethers, terpenes, alkanes, aromatic hydrocarbons, acids, olefins, phenols, lipids, ketones, alcohols and other compounds were larger, indicating these are the differential substances distinguishing the different geographic distributions of G. pensilis. Cluster analysis results showed that Qintang, Cangwu and Yanshan clustered into one group, Pingle and Binyang clustered into another group, and Tiandeng formed a separate group. Correlation analysis between volatile components and environmental factors indicated that longitude and altitude had the greatest impact on the content of volatile components. The study would provide reference for the cultivation and resource utilization of G. pensilis.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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