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The pathogen causing heart rot of Abies georgei var. smithii in southeastern Xizang and screening of antagonistic Trichoderma strains
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Jieting LI1, Yi LI1, Yuzhuo LIU1, Ganggang CHEN1, Yibo ZHANG1, Ning JIANG2, Yonglin WANG3, Jiangrong LI1, 4, *
Mycosystema | 2026, 45(4) : 250270
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Mycosystema | 2026, 45(4): 250270
• Research paper •
The pathogen causing heart rot of Abies georgei var. smithii in southeastern Xizang and screening of antagonistic Trichoderma strains
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Jieting LI1, Yi LI1, Yuzhuo LIU1, Ganggang CHEN1, Yibo ZHANG1, Ning JIANG2, Yonglin WANG3, Jiangrong LI1, 4, *
Affiliations
  • 1 National Forest Ecosystem Observation & Research Station of Linzhi Xizang, Key Laboratory of Forest Ecology in Xizang Plateau Affiliated with Ministry of Education, Institute of Xizang Plateau Ecology, Xizang Agricultural and Animal Husbandry University, Linzhi 860000, Xizang, China
  • 2 Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
  • 3 College of Forestry, Beijing Forestry University, Beijing 100083, China
  • 4 Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
Published: 2026-04-22 doi: 10.13346/j.mycosystema.250270
Outline
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Heart rot disease poses a severe threat to the health of Abies georgei var. smithii forests in southeastern Xizang. This study aimed at identifying the causal pathogen and screening highly antagonistic Trichoderma strains as well as evaluating their antifungal activity to provide potential biocontrol resources for managing this disease. The pathogen was identified through tissue isolation, morphology observation and molecular phylogenetic analysis. Antagonistic Trichoderma strains were initially screened using the dual-culture assay, and their inhibitory activity was further evaluated by assessing both volatile metabolites (via the two-sealed-base- plates method) and non-volatile metabolites (via the solid dilution method with sterile culture filtrates). Results indicated that the dominant pathogen infecting living A. georgei var. smithii trees was Fomitopsis subpinicola. In total, 36 Trichoderma strains were isolated, among which strain M28 exhibited the strongest inhibition in the dual-culture assay. Assessment of volatile metabolites revealed that Trichoderma afroharzianum M28 had the highest inhibitory effect, and T. atroviride M49 was in the next place. Tests with sterile culture filtrates demonstrated that filtrates of all seven selected Trichoderma strains inhibited the pathogen’s growth at different tested concentrations. The filtrate of T. atroviride M49 exhibited the strongest inhibitory activity at concentrations of 25% and 33%. This study confirms F. subpinicola as the causal agent of heartwood brown rot in A. georgei var. smithii in southeastern Xizang, and highly antagonistic Trichoderma strains M49 and M28 are excellent candidates of biological control agents.

Abies georgei var. smithii  /  heart rot  /  Fomitopsis pinicola  /  Trichoderma spp.  /  biocontrol agent
Jieting LI, Yi LI, Yuzhuo LIU, Ganggang CHEN, Yibo ZHANG, Ning JIANG, Yonglin WANG, Jiangrong LI. The pathogen causing heart rot of Abies georgei var. smithii in southeastern Xizang and screening of antagonistic Trichoderma strains[J]. Mycosystema, 2026 , 45 (4) : 250270 - . DOI: 10.13346/j.mycosystema.250270
Funding
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  • Science and Technology Project of Nyingchi City, Xizang Autonomous Region(SYQ2024-14)
  • Science and Technology Project of the Department of Science and Technology of Xizang Autonomous Region(XZ202301JD0001G)
  • Xizang Agriculture and Animal Husbandry University Doctoral Program in Forestry (PhaseⅠ)(533325001)
  • Key Laboratory of Forest Ecology in Xizang Plateau (Xizang Agricultural and Animal Husbandry University), Ministry of Education(JYBSYS-202404)
Appendix
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Year 2026 volume 45 Issue 4
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89
43
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Article Info
doi: 10.13346/j.mycosystema.250270
  • Receive Date：2025-09-10
  • Online Date：2026-04-30
  • Published：2026-04-22
Article Data
Affiliations
History
  • Received：2025-09-10
  • Accepted：2025-11-16
Funding
Science and Technology Project of Nyingchi City, Xizang Autonomous Region(SYQ2024-14)
Science and Technology Project of the Department of Science and Technology of Xizang Autonomous Region(XZ202301JD0001G)
Xizang Agriculture and Animal Husbandry University Doctoral Program in Forestry (PhaseⅠ)(533325001)
Key Laboratory of Forest Ecology in Xizang Plateau (Xizang Agricultural and Animal Husbandry University), Ministry of Education(JYBSYS-202404)
Affiliations
    1 National Forest Ecosystem Observation & Research Station of Linzhi Xizang, Key Laboratory of Forest Ecology in Xizang Plateau Affiliated with Ministry of Education, Institute of Xizang Plateau Ecology, Xizang Agricultural and Animal Husbandry University, Linzhi 860000, Xizang, China
    2 Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
    3 College of Forestry, Beijing Forestry University, Beijing 100083, China
    4 Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China

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表12种不同金属材料的力学参数
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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