Suplement 1A. Full results of GC-MS analysis of Populus spp. buds essential oils* Black poplars (Populus nigra L.) Aspens (Populus tremula L.) Component RT KIEXP KIMF KINIST PN1 PN2 PN3 PN4 PN5 PN6 PN7 PT1 PT2 PT3 PT4 PT5 PT6 2-Methylbutanoic acid 4.35 836 ND1 839 tr tr - tr tr - - - - - - - - **o-Xylene 5.39 879 ND1 881 - - - - - tr tr - - - - - - Prenyl acetate 6.00 901 902 902 0.07 tr - - - - - - - - - - - trans-2-Methyl-2-butenoic acid (Tiglic acid) 6.15 907 ND1 946 0.07 0.05 tr - - tr - - - - - - - *α-Thujene 6.58 921 932 925 tr tr - - - - - - - - - - - Benzaldehyde 6.76 927 941 933 0.10 0.08 - tr - tr tr tr - 0.13 0.18 0.15 0.07 α-Pinene 6.79 930 936 933 - - 0.18 tr 0.24 - tr - - - - - - **Camphene 7.23 942 950 946 tr tr - - - - - - - - - - - Phenol 7.77 957 ND1 957 - - - - - 0.12 - - - - 0.19 0.20 0.23 *3-Hydroxy-2-methyl-cyclopent-2-enone 7.92 962 ND1 977 0.14 0.06 0.06 - 0.42 - - - - - - - - 6-Methyl-5-hepten-2-one 8.01 965 ND1 964 - - - - - 0.12 - - - - - - - **Sabinene 8.09 967 973 967 - - tr - tr - - - - - - - - **n-Hexanoic acid 8.26 971 ND1 982 - - - - - tr tr tr - - - - - **n-Octanal 8.60 980 981 982 - - - - 0.06 - - - - - - - - *β-Pinene 8.67 982 978 973 - - tr tr tr - - - - - - - - **α-Phellandrene 9.02 992 1002 998 - - tr - - - - - - - - - - Benzyl alcohol 9.49 1001 1006 1012 3.22 4.19 0.07 0.99 0.06 1.03 0.75 1.03 0.29 1.79 4.23 7.04 15.15 **α-Terpinene 9.54 1004 1013 1010 - - tr - - - - - - - - - - Salicylaldehyde 9.57 1005 1012 1029 - - - 0.24 1.06 0.20 0.17 - 0.06 0.64 0.74 0.65 1.08 **m-Cymene 9.66 1007 1013 1010 - - tr - - - - - - - - - - **β-Phellandrene 9.96 1015 1023 1021 - - tr - - - - - - - - - - Eucalyptol (1,8-Cyneole) 10.02 1016 1024 1022 tr tr - - tr - - - - tr - - - Limonene 10.03 1017 1025 1023 - - 0.12 tr 0.10 tr tr - - 0.06 - - - **cis-β-Ocimene 10.35 1026 1029 1028 tr tr - - - - - - - - - - - Acetophenone 10.56 1030 1036 1042 0.09 0.15 - tr tr - - - - tr - - - **trans-β-Ocimene 10.82 1038 1041 1038 - - tr - tr - - - - - - - - Benzyl formate 11.15 1046 1060 1046 - - - - - - - - - tr 0.10 0.06 - **γ-Terpinene 11.24 1047 1051 1050 - - - tr tr - - - - - - - - 1 Suplement 1B. Component RT KIEXP KIMF KINIST PN1 PN2 PN3 PN4 PN5 PN6 PN7 PT1 PT2 PT3 PT4 PT5 PT6 trans-Linalool oxide (furanoid) 11.61 1055 1058 1064 tr tr - 0.39 tr - - 0.14 0.15 0.12 - - - o-Guaiacol 11.66 1058 1072 1063 - - - - - tr tr - - - 0.15 0.15 0.35 Methyl benzoate 12.01 1065 1072 1072 - tr - 0.08 - tr tr tr - - 0.07 0.10 0.19 cis-Linalool oxide (furanoid) 12.21 1065 1072 1072 tr tr - 0.09 tr tr tr tr - tr 0.34 0.40 0.39 p-Cymene 12.15 1069 1075 1074 tr tr - - - - - - - - - - - *Terpinolene 12.50 1075 1082 1079 - - tr - tr - - - - - - - - 2-Phenylethanol 12.65 1079 1081 1088 0.34 4.25 tr 0.25 - 1.06 1.00 - - - 1.28 3.69 34.53 2-Nonanol 12.71 1082 1085 1089 - - - - - tr tr - - 0.05 0.10 0.12 0.18 Linalool 12.78 1082 1086 1086 - 0.22 tr 1.63 0.71 tr tr - - 0.09 0.11 0.13 0.29 *Benzyl component 12.91 1086 ND1 ND1 - - - - - - - - - - - - - **2-Metylobutyl-3-methylbutanoate 13.12 1090 ND1 1091 - - - - - tr tr - - - - - - **2-ethenyl-1,1-dimethyl-3-methylene-cyclohexane 13.49 1098 ND1 ND1 - - - 0.05 - - - - - - - - - **Veratrole 13.91 1106 1117 1111 - - - 0.06 - - - - - - - - - *2-Metyleno-acetophenone 14.19 1115 ND1 ND1 - - - 0.27 - - - - - - - - - Benzenepropanal 14.26 1117 ND1 1130 - - - - - 0.53 0.39 - - - - - - *cis-Pinocarveol 14.28 1118 1126 1126 tr tr - - - - - - - - - - - *Walerian 3-metylobut-2-enylu 14.55 1124 ND1 ND1 - - - 0.12 - - - - - - - - - **2-Fenylobutadien 14.66 1127 ND1 ND1 - 0.05 - - - - - - - - - - - Benzyl acetate 14.78 1130 1134 1139 0.48 0.14 - - tr tr tr - - tr 0.07 0.06 0.08 *cis-2-Nonenal 14.94 1134 ND1 1135 - - - - - - - - - - 0.18 0.20 - tran/cis-Linalool oxide (Pyranoid) 15.45 1144 1144 1164 - - - tr - - - 0.09 0.16 tr 0.14 0.17 0.28 Benzoic acid 16.26 1138 1160 1161 tr tr - - - 0.12 0.05 - - - 0.08 0.07 - o-Ethylphenol 15.21 1140 ND1 1139 - - - - - - - - - - - - - Ethyl benzoate 15.24 1141 1150 1142 - - - 0.06 - - - - - - - - - **Borneol 15.31 1142 1150 1136 - tr tr - - - - - - - - - - p-Cymen-8-ol 15.81 1154 ND1 1163 - - - tr tr - - - - - - - - 2 Suplement 1C. Component RT KIEXP KIMF KINIST PN1 PN2 PN3 PN4 PN5 PN6 PN7 PT1 PT2 PT3 PT4 PT5 PT6 **Terpinen-4-ol 15.88 1155 1164 1160 - tr tr tr tr - - - - tr - - - Methyl salicylate 16.29 1163 1171 1175 tr tr - 0.44 - 0.59 0.75 0.27 - 0.12 0.86 0.78 0.34 **a-Terpineol 16.45 1166 1176 1175 tr tr tr - tr tr tr - - 0.08 - - - **Safranal 16.39 1167 1182 1173 - - - 0.09 - - - - - - - - - β-Cyclocitral 17.48 1187 1195 1173 0.07 0.09 tr 0.75 tr - - - - - - - - 2,3-Dihydrobenzofuran 17.53 1188 ND1 1190 - - - 0.56 - 0.92 0.68 tr - - 0.35 0.55 0.38 **p-Anisaldehyde 18.24 1206 1218 1224 - - - - - tr tr - - - - - - 2-Phenylethyl acetate 18.83 1221 1235 1228 0.36 0.09 - tr - tr 0.06 - - - - - - **cis-Cinnamaldehyde 18.94 1223 1234 1237 - - - - - - - tr - - - - - **Allyl benzoate 19.00 1224 ND1 1239 - - - - - - - tr - - - - - cis-Geraniol 19.43 1233 1235 1237 0.10 0.13 - - - - - tr 0.05 0.06 1.87 3.44 - n-Propyl benzoate 19.56 1238 1275 1275 - - - 0.20 - 0.13 0.12 - - - - - - Cinnamic alcohol 20.86 1269 1274 1275 - 0.09 - - - 0.67 0.50 - - - - - - *p-Vinylguaiacol 21.31 1277 1311 1295 0.24 0.27 - - - tr tr 0.30 0.13 0.09 4.24 5.26 1.31 2-Hydroxy-5-methylacetophenone 21.90 1290 ND1 1285 - - - - tr - - - - - - - - Methyl o-methoxybenzoate 21.97 1291 1300 1291 - 0.06 - 1.35 - - - - - - - - - 1-Methylpropyl benzoate 22.12 1294 1306 1302 - - - 3.18 - - - - - - - - - **Methyl geramate 22.26 1297 1306 1308 0.12 0.11 - - - - - - - - - - - **Methyl decanoate 22.60 1306 1300 1308 - tr - - - - - - - - - - - Methyl benzoylformate 22.73 1312 1313 ND1 - - - 1.48 - - - - - - - - - **8,9-Dehydro-cycloisolongifolene 22.98 1325 1320 ND1 - - tr tr - - - - - - - - - Eugenol 23.26 1331 1331 1335 0.20 0.28 tr - tr 0.05 0.05 0.30 0.50 0.20 2.28 3.78 14.21 3,4-Dimethoxystyrene 23.44 1337 1337 1354 - - - - 0.14 - - - - - - - - Butyl benzoate 23.79 1349 1556 1351 - - - 0.72 - 1.60 1.82 - - - - - - α-Cubebene 23.79 1349 1355 1365 - - tr - tr - - 0.11 0.06 0.13 - - - **Vanillin 23.93 1354 1355 1360 - - - - - - - tr - - - - - **Cyklosativene 24.15 1362 1390 ND1 - tr 0.05 - tr - - - - - - - - 3 Suplement 1D. Component RT KIEXP KIMF KINIST PN1 PN2 PN3 PN4 PN5 PN6 PN7 PT1 PT2 PT3 PT4 PT5 PT6 **Benzyl 3-methyl butanoate 24.20 1363 ND1 1371 0.05 0.05 - - - - - - - - - - - **Cypera-2,4-diene 24.33 1373 1365 ND1 - - 0.07 - - - - - - - - - - α-Ylanglene 24.40 1370 1376 1370 0.35 0.30 0.61 0.27 0.36 - - 0.09 tr 0.06 - - - α-Copaene 24.52 1374 1379 1376 1.43 1.65 tr 0.59 tr tr tr 0.82 0.16 0.52 0.34 0.51 0.17 **β-Bourbonene 24.67 1379 1386 1382 - - - - - - - tr 0.05 tr 0.05 0.05 tr **β-Elemene 24.73 1381 ND1 1388 - - - - - - - - 0.06 0.08 - - - **β-Cubebene 24.76 1382 1378 ND1 - - 0.12 - - - - tr - 0.06 - - - 7-epi-Sesquithujene 24.84 1385 1387 1385 tr 0.16 - - tr - - - - - - - - **Cyperene 25.11 1394 1402 1398 - - - - - - - tr - tr - - - 2-Hydroxy-2-methylpropyl benzoate 25.06 1392 ND1 1406 - - - tr - 0.57 0.53 - - - - - - **Cedrene 25.13 1392 ND1 1406 - - tr - - - - - - - - - - **Sesquithujene 25.15 1395 1399 1411 - tr - - tr - - - - - - - - α-Cedrene 25.20 1397 1413 1418 0.17 0.14 tr 0.06 tr tr 0.09 tr - - - - - cis-α-Bergamotene 25.37 1400 1409 1409 1.39 1.31 - - 0.14 0.64 0.91 - - - 0.11 0.11 - cis-β-Caryophyllene 25.39 1401 1409 1409 - 0.26 0.23 - 1.18 0.11 0.08 0.32 18.76 24.01 tr 0.09 - 2-Methylbutyl benzoate 25.33 1402 1419 1422 - - - 5.98 - 4.61 5.97 - - - - - - **3-Methylbut-3-enyl benzoate 25.41 1408 ND1 1426 - - - 0.13 - - - - - - - - - β-Copaene 25.50 1414 1430 1426 tr 0.17 0.05 0.06 0.56 tr tr 0.17 tr 0.08 tr tr tr *Sesquiterpene hydrocarbon 25.58 1419 ND1 ND1 - - tr - - - - - - - - - - trans-α-Bergamoten 25.70 1427 1434 1443 2.87 3.28 - 0.49 0.25 1.42 0.76 - - - 0.34 0.35 - α-Guaiene 25.73 1430 1434 1444 - - - - - - - - 6.91 10.24 - - - **cis-Muurola-3,5-diene 25.83 1436 1447 1454 - - - - tr - - tr 0.10 - - - - **Cadena-3 5-diene 25.85 1437 1448 *1458 - 0.14 - - 0.06 - - 0.07 - - - - - **Guaia-6,9-diene 25.86 1438 1448 1443 - - - 0.14 - - - - - - - - - **Isogermacrene D 25.89 1440 1445 1437 - - - - - 0.09 0.13 - - - - - - α-Humulene 25.94 1444 1455 1447 0.13 0.39 0.31 0.05 0.40 - - 0.15 8.30 8.77 - - - cis-β-Farnesene 25.99 1447 1446 1448 0.36 1.13 0.37 0.23 0.18 0.28 0.14 - - - - - - 4 Suplement 1E.