Abstract
Botrytis cinerea is a destructive phytopathogenic ascomycete causing severe pre- and postharvest yield losses in tomato-growing areas worldwide. Due to fungicide resistance development in B. cinerea strains, its chemical control has become a serious challenge for tomato growers. In the present investigation, 47 fungal isolates were obtained and screened for their biocontrol potency against B. cinerea, and 12 isolates showed significant biocontrol efficacy. In 12 fungal bioagents, Trichoderma harzianum isolate Tr‑3, identified by internal transcribed spacer (ITS) region sequence analysis, significantly suppressed the in vitro mycelial growth of B. cinerea. Furthermore, different concentrations (10, 25, 50, and 100 ppm) of zinc nanoparticles (ZnO-NPs) demonstrated remarkable suppression of in vitro mycelial growth. At higher concentrations (100 ppm) of ZnO-NPs, 88% mycelial growth inhibition of the pathogen was recorded. Moreover, foliar applications of T. harzianum suspension and ZnO-NPs in the greenhouse provided a promising control of B. cinerea infection in tomato plants, and a significant reduction in disease severity (68.5 and 83.4%, respectively) was recorded. While the foliar applications attenuate disease intensity, a significant increase in plant biomass was also recorded, which demonstrated the plant growth-promoting potential of indigenous T. harzianum and ZnO-NPs. Additionally, the antioxidant and phytochemical analysis of treated tomato leaves demonstrated higher levels of catalase (CAT) and peroxidase (PO) activity in ZnO-NP-treated plants followed by T. harzianum-treated plants. Thus, these results suggested that ZnO-NPs and indigenous T. harzianum as biocontrol could suppress B. cinerea infection in the greenhouse, either directly or indirectly as resistance inducers. Therefore, ZnO-NPs and T. harzianum may be applied as an alternative to fungicides to alleviate gray mold disease in tomato caused by the resistance problems in B. cinerea.
Zusammenfassung
Botrytis cinerea ist ein zerstörerischer phytopathogener Ascomycet, der in Tomatenanbaugebieten weltweit schwere Ertragseinbußen vor und nach der Ernte verursacht. Aufgrund der Entwicklung von Fungizidresistenzen bei B.-cinerea-Stämmen ist seine chemische Bekämpfung zu einer ernsten Herausforderung für Tomatenanbauer geworden. In der vorliegenden Untersuchung wurden 47 Pilzisolate gewonnen und auf ihre Bioregulatorwirksamkeit gegen B.-cinerea-Stämme untersucht, wobei 12 Isolate eine signifikante Bioregulatorwirksamkeit zeigten. Von den 12 Pilz-Bioagenzien unterdrückte das Isolat Tr‑3 von Trichoderma harzianum, das durch ITS-Sequenzierung („internal transcribed spacer“) identifiziert wurde, das In-vitro-Myzelwachstum von B. cinerea erheblich. Außerdem zeigten verschiedene Konzentrationen (10, 25, 50 und 100 ppm) von Zink-Nanopartikeln (ZnO-NP) eine bemerkenswerte Unterdrückung des In-vitro-Myzelwachstums. Bei höheren Konzentrationen (100 ppm) von ZnO-NP wurde eine 88%ige Hemmung des Myzelwachstums des Erregers festgestellt. Die Blattanwendungen von T.-harzianum-Suspension und ZnO-NP im Gewächshaus führten zu einer vielversprechenden Eindämmung von B.-cinerea-Infektionen auf Tomatenpflanzen, und es wurde eine signifikante Reduzierung der Krankheitsschwere (68,5 % bzw. 83,4 %) festgestellt. Obwohl die Blattanwendungen die Krankheitsintensität abschwächten, wurde auch ein signifikanter Anstieg der Pflanzenbiomasse festgestellt, was das pflanzenwachstumsfördernde Potenzial von T. harzianum und ZnO-NP belegt. Darüber hinaus zeigte die antioxidative und phytochemische Analyse der behandelten Tomatenblätter eine höhere Aktivität von Katalase (CAT) und Peroxidase (PO) bei den mit ZnO-NP behandelten Pflanzen, gefolgt von den mit T. harzianum behandelten Pflanzen. Diese Ergebnisse deuten darauf hin, dass ZnO-NP und T. harzianum als Bioregulator die B.-cinerea-Infektion im Gewächshaus entweder direkt oder indirekt als Resistenzinduktoren unterdrücken können. Daher können sie als Fungizidalternative eingesetzt werden, um die Resistenzprobleme bei Grauschimmel an Tomaten durch B. cinerea zu lindern.
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Abbreviations
- ANOVA:
-
Analysis of variance
- CAT:
-
Catalase
- FRAC:
-
Fungicide Resistance Action Committee
- ITS:
-
Internal transcribed spacer
- PDA:
-
Potato dextrose agar
- PO:
-
Peroxidase
- ZnO-NPs:
-
Zinc oxide nanoparticles
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Acknowledgements
The authors extend their appreciation to Taif University for funding the current work by Taif University Researchers Supporting Project number (TURSP—2020/139), Taif University, Taif, Saudi Arabia. We acknowledge the Chairman of the Department of Arid Land Agriculture, King Abdulaziz University, for support with performing the experiments in the Laboratory of Plant Pathology.
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This project was funded by Taif University Researchers Supporting Project number (TURSP—2020/139), Taif University, Taif, Saudi Arabia.
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All authors contributed equally in the manuscript, Imran, Abdel-Rahim, and Abo-Elyousr suggested the idea of the work and contributed to data curation and their validation as well as writing original draft. Bagy and Abdel-Rahim contributed to the formal analysis of the data, El-Sharnouby, Sallam, and Ali contributed to the reviewing and editing the manuscript. All authors reviewed and approved the final version of the manuscript.
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M. Imran, K.A. Abo-Elyousr, M. El-Sharnouby, E.F. Ali, N.M. Sallam, H.M.M.K Bagy, and I.R. Abdel-Rahim declare that they have no competing interests.
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Imran, M., Abo-Elyousr, K.A.M., El-Sharnouby, M.E. et al. Biocontrol Potential of Trichoderma harzianum and Zinc Nanoparticles to Mitigate Gray Mold Disease of Tomato. Gesunde Pflanzen 75, 151–163 (2023). https://doi.org/10.1007/s10343-022-00686-3
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DOI: https://doi.org/10.1007/s10343-022-00686-3