
Fig 1.
Phytopathogens growth inhibition in dual culture antagonism and antibiosis assays by I. lacteus (CMU-8413). In dual culture antagonism assays, I. lacteus was inoculated at the left. Tested phytopathogens were Fusarium pseudocircinatum, Fusarium mexicanum, Colletotrichum coccodes, Colletotrichum gloeosporioides, Phytophthora capsici, and Phytophthora cinnamomi. Assays were conducted in potato dextrose agar (PDA) medium at 28°C. Growth inhibition percentages are the mean of three independent assays and standard deviation (S.D.) is shown in parenthesis. Statistically significant (p < 0.01) growth inhibition values when compared with their respective control are indicated with an asterisk. Significance was determined by Student’s t-tests, independent by groups, and they were carried out using STATISTICA data analysis software system (StatSoft, Inc. 2007, version 7. http://www.statsoft.com).
Table I
Extracellular metabolites produced by Irpex lacteus (strain CMU-8413) at stationary phase.
| Compound name | Molecular formula | Observed m/z | Adduct | Main fragment ions m/z | Compound class |
|---|---|---|---|---|---|
| Apotrichodiol | C15H24O3 | 251.1652 | m-h | 233.1547 | Sesquiterpene |
| Apotrichothecene | C15H24O2 | 201.1637 | M+H-2H20 | 157.1481, 186.1403, 173.1348, 159.1185, 145.1029, 128.0639, 115.0558, 105.0711 | Sesquiterpenoid epoxide |
| Blennin D | C15H22O4 | 265.1436 | m-h | 237.1386, 221.1418, 205.1473, 191.1441, 187.1406, 175.1412 | Sesquiterpene |
| Collybial | C15H20O2 | 215.1424 | m+h-h2o/M+H | 187.1512, 173.1325, 159.0804, 157.1008, 142.0792, 128.0869, 115.0534 | Sesquiterpene |
| Cyclocalopin A | C15H20O6 | 295.1168 | m-h | 251.1160, 233.1149, 221.1123, 215.0924, 203.1027, 189.1142, 173.0818, 167.0634, 157.0526 | Sesquiterpene |
| Dehydrooreadone | C14H18O3 | 279.1218 | M+FA-H | 261.0987, 233.1046, 219.0902, 201.0804, 189.1178, 185.0502, 183.0663, 173.0874 | Sesquiterpene |
| Dictyoquinazol A | C17H16N2O4 | 311.1090 | m-h | 267.1079, 237.0366, 205.1134, 193.1114, 187.1005, 175.1036, 159.0740, 151.0638, 149.0482 | Quinazoline |
| Dihydromarasmone | C15H20O5 | 279.1216 | m-h | 235.0976, 219.1390, 217.1131, 207.1277, 191.1342, 173.1250, 163.0871 | Sesquiterpene |
| Frequentin | C14H20O4 | 233.1181 | m-h2o-h | 205.1234, 196.8934, 189.1195, 173.0864 | Cyclohexanecarbaldehyde |
| Ganodermic acid Jb | C30H46O4 | 453.3436 | M+H-H20 | 322.2571, 208.3768, 119.0945 | Triterpene |
| Geosmin | C12H220 | 203.1431 | M+Na-2H | 201.1177, 188.1100, 187.1010, 175.1426, 147.0792 | Sesquiterpene |
| Microdiplodiasol | C15H18O7 | 309.0948 | M-H | 265.0858, 203.0963, 193.1139, 187.0612, 175.1035 | Xanthone derivative |
| Pandangolide 1 | C12H20O5 | 243.1242 | m-h | 203.6930, 181.1234 | Polyketide |
| Piperdial | C15H22O3 | 251.1617 | m+h | 233.1537, 215.1455, 205.1587, 191.1067, 187.1503, 177.0810, 159.1189, 145.1029 | Unsaturated dialdehyde |
Table II
The previous reports on extracellular metabolites produced by Irpex lacteus (strain CMU-8413) at stationary phase.
| Metabolite | Fungal species | Sourcea | Bioactivity/Commenta | Reference |
|---|---|---|---|---|
| Apotrichodiol | Fusarium spp. | EM | mycotoxin | (Lebrun et al. 2015) |
| Apotrichothecene | Fusarium spp. | EM | mycotoxin | (Lebrun et al. 2015) |
| Blennin D | Lentinellus cochleatus | BE | inhibitor of leukotriene biosynthesis | (Wunder et al. 1996) |
| Collybial | Collybia confluens | EM | antibacterial, antiviral | (Simon et al. 1995) |
| Cyclocalopin A | Caloboletus radicans | BE | antioxidant, antibacterial | (Tareq et al. 2018) |
| Dehydrooreadone | Marasmius oreades | EM | NT | (Ayer and Craw 1989) |
| Dictyoquinazol A | Dictyophora indusiata/other basidiomycetes | BE | neuroprotective | (Lee et al. 2002) |
| Dihydromarasmone | Marasmius oreades | EM | antimicrobial | (Ayer and Craw 1989) |
| Frequentin | Penicillium frequentans/Penicillium spp. | EM | antifungal, antibacterial | (Curtis et al. 1951) |
| Ganodermic acid Jb | Ganoderma lucidum | ME | NT | (Shiao et al. 1988) |
| Geosmin | Cortinarius herculeus/Cystoderma spp. | BE | musty-earthy odor | (Breheret et al. 1999) |
| Microdiplodiasol | Microdiplodia sp. | EM | antifungal antibacterial | (Siddiqui et al. 2011) |
| Pandangolide 1 | Cladosporium marine | EM | NA | (Gesner et al. 2005) |
| Piperdial | Lactarius spp./Russula queletii | BE | produced by damage | (Sterner et al. 1985) |