Characterization of endophytic yeast and its suppressive effect on root rotting fungi of tomato under neem cake soil amendment

Egyptian Journal of Biological Pest Control

Ayesha Jamal¹  Syed Ehteshamul-Haque¹  Hafiza Farhat¹  Afshan Rahman¹  Faizah Urooj¹  Muhammed Irfan² 

[1] Agricultural Biotechnology and Phytopathology Laboratory, Department of Botany, University of Karachi, 75270, Karachi, Pakistan;Jamil-ur-Rahman Center for Genome Research, International Center for Chemical and Biological Sciences (ICCBS), University of Karachi, 75270, Karachi, Pakistan;

关键词: Endophytic yeast;    Neem cake;    Biological control;    Root rot;    Tomato plant;   

DOI  :  10.1186/s41938-021-00493-4

来源: Springer

【 摘 要 】

BackgroundThe exposure of crops to a variety of fungal and bacterial pathogens leads to huge economic losses. Different strategies are being adapted to control these diseases among which the application of chemicals fungicide is common. However, these chemicals are posing a serious threat to the environment. For biological management of root rot disease of tomato and better fruit quality, studies were conducted on the possible use of endophytic yeast as a biocontrol agent.ResultsEndophytic yeasts were isolated from healthy plants and identified. Identification of selected isolates was confirmed on the basis of 18S rDNA gene sequencing. They were evaluated for suppressive effect on root rotting fungi in vitro and also in vivo on tomato plants, used alone or under neem cake soil amendment. Seventy-six isolates of yeasts were evaluated against root rotting fungi Fusarium oxysporum, F. solani, Rhizoctonia solani and Macrophomina phaseolina using dual culture plate assay. Seventy-five isolates were found to suppress radial growth of F. oxysporum, F. solani and M. phaseolina by producing zones of inhibition or lysing the fungal hyphae. However, none of the isolates was found to inhibit R. solani in vitro. Most of the isolates also caused nematicidal activity at varying degree against Meloidogyne javanica. All test isolates produced indole acetic acid in vitro and solubilized phosphorus. In pots and field plot experiments, test isolates of yeasts were able to suppress root rotting fungi on tomato in natural soil and soil amended with neem cake with enhancement of growth of tomato plants. Yeasts were also found to ameliorate the plant resistance through enhancing polyphenolic contents, salicylic acid and antioxidant activity.ConclusionsEndophytic yeasts were found effective against root rot disease of tomato and could be used as a potential biocontrol agent for the management of soil-borne diseases of tomatoes.

【 授权许可】

CC BY