Phosphite mediated enhancement of defence responses in Agrostis stolonifera and Poa annua infected by Microdochium nivale

Dempsey, J.J, Wilson, I., Spencer‐Phillips, P.T.N. and Arnold, D.L. (2022) Phosphite mediated enhancement of defence responses in Agrostis stolonifera and Poa annua infected by Microdochium nivale. Plant Pathology.

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Abstract

The ascomycete fungus Microdochium nivale is one of the most damaging pathogens of cool season turfgrass. Prevention of and recovery from infection is costly to many sports facilities each year. In recent years, use of many chemical plant protectants have been restricted and turfgrass managers have increasingly sought alternative measures for disease control. The use of phosphite has been shown to be effective in reducing M. nivale disease symptoms in Agrostis stolonifera and Poa annua. The aims of this research were to assess initial defence responses in M. nivale infected turfgrass, specifically total phenolic content and hydrogen peroxide generation, to determine the effect phosphite treatment has on these responses and on suppression of symptoms. Phenolic compounds and H2O2 are shown to be components of host responses. Phosphite treatment led to enhanced accumulations of total phenolic content, and that when applied sequentially or singly to greenhouse plants, it led to significant reductions in M. nivale disease symptoms compared to phosphate-treated plants or controls. H2O2 extractions indicated that while phosphite treatment increased H2O2 generation compared to controls, the effect was no different to the responses in phosphate-treated plants.

Item Type: Article
Keywords: Microdochium nivale, phosphite, turfgrass, phenolic compounds, hydrogen peroxide
Divisions: Agriculture and Environment (from 1.08.20)
Depositing User: Mrs Rachael Harper
Date Deposited: 24 May 2022 14:56
Last Modified: 24 May 2022 14:56
URI: https://hau.repository.guildhe.ac.uk/id/eprint/17850

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