Screening fungal endophytes from apple trees and their antagonistic characteristics

DENG Zhenshan; ZHANG Weimin; CHEN Miao

doi:10.7671/j.issn.1001-411X.2016.02.011

Journal of South China Agricultural University > 2016 > 37(2): 73-78. > DOI: 10.7671/j.issn.1001-411X.2016.02.011

DENG Zhenshan, ZHANG Weimin, CHEN Miao. Screening fungal endophytes from apple trees and their antagonistic characteristics[J]. Journal of South China Agricultural University, 2016, 37(2): 73-78. DOI: 10.7671/j.issn.1001-411X.2016.02.011

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Screening fungal endophytes from apple trees and their antagonistic characteristics

College of Life Sciences, Yan'an University, Yan'an 716000, China

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Received Date: April 27, 2015
Available Online: May 17, 2023

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Abstract

Abstract

Objective
To screen fungal endophytes against Valsa malimiyabe and Glomeralla cingulata from apple trees and explore their inhibitory effects.
Method
Fungal endophytes were isolated from roots, stems and rhizosphere soil of healthy apple plants. Their antifungal activities against V. malimiyabe and G. cingulata were examined using in vitro dual culture assay. Heat-resistant properties of antifungal substances were tested using the fermentation culture of the isolated fungal endophytes.
Result
Eighteen endophytic fungus strains belonging to three genera were isolated and half of the 18 strains were from stem. The dual culture assay showed eight strains had above 60% inhibition rate against V. malimiyabe and G. cingulata. J₂, J₁₆ and J₁₇ strains strongly inhibited V. malimiyabe with the inhibition rates of 82.75%, 84.31% and 82.35% respectively. The inhibition rate of T₁ to G. cingulata reached 80.67%. The culture filtrates of fungal endophytes J₂, J₁₆, J₁₇, J₂₄, T₁ inhibited the conidia germination of both pathogens, and all of the inhibition rates were not less than 39.55% and the highest value was 69.75%. The sterile filtrate of J₁₁ and T₁ showed high heat stability at 121 ℃, while J₂ lost bioactivity at 100 ℃.
Conclusion
Fungal endophytes J₂, J₁₁, J₁₆, J₁₇ and T₁ have strong inhibitory effects against V. malimiyabe and G. cingulata, and therefore are potential candidates for biological control of these two pathogens.
- apple tree,
- Valsa malimiyabe,
- Glomeralla cingulata,
- fungal endophyte,
- antifungal activity,
- heat resistance

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References (23)

References

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