Effectiveness of some resistance inducers for controlling carnation vascular wilting caused by Fusarium oxysporum f. sp. dianthi

Abstract

The effect of different resistance inducers against carnation vascular wilting caused by Fusarium oxysporum f. sp. dianthi (Fod) was evaluated, as well as its relation with the content of phenols and flavonoids in roots of the carnation plants. Indexed cuttings of carnation (Dianthus caryophyllus L.) were used with three-weeks of rooting (variety Solex susceptible to the disease). The resistance inducers: Ascorbic Acid, Salicylic Acid, Thiamine and Potassium Phosphite, were applied by spray or drench before Fod inoculation. Compared to controls, it was found that disease incidence and severity measured as the area under the disease progress curve, decreased with the application of all inductors except for K₃PO₃ spray-applied treatment. Plants treated with thiamine showed, in addition, an increase in the content of phenols and flavonoids. These results suggested the potential of thiamine as a resistance inducer in the management of carnation vascular wilting caused by Fusarium oxysporum f. sp. dianthi.

Keywords:

• Disease incidence
• disease severity
• flavonoids
• phenolic compounds

Acknowledgements

We thank Universidad Nacional de Colombia and Colciencias (currently MinCiencias) for the financial support for the project “Study of the biochemical, molecular and physiological responses caused by the application of resistance inducers in carnation (Dianthus caryophyllus L): new clean alternatives for the control of wilt vascular wilt” [Grant number RC No. 80740-148-2019].

Disclosure statement

There is no potential conflict of interest in the submitted work.

Additional information

Funding

This work was supported by the Universidad Nacional de Colombia and Colciencias (currently MinCiencias) under Grant number RC No. 80740-148-2019.