Open AccessAntioxidant reactions in winter wheat seedlings of different cultivars exposed to the Pseudomonas syringae and its lipopolysaccharides in vitro
Author(s) -
A. Pastoschuk,
Mariia Kovalenko,
Larysa Skivka
Publication year - 2021
Publication title -
vestnik kievskogo nacionalʹnogo universiteta imeni tarasa ševčenko/vìsnik
Language(s) - English
Resource type - Journals
eISSN - 2308-8036
pISSN - 1728-3817
DOI - 10.17721/1728_2748.2021.84.61-66
Subject(s) - pseudomonas syringae , biology , pathogen , host (biology) , pseudomonas , bacteria , cultivar , pseudomonadaceae , microbiology and biotechnology , botany , ecology , genetics
Pseudomonas syringae is the most common phytopathogenic bacterium with a wide range of target plants, which include important cereals such as wheat. One of the main pathogens of bacterial diseases of wheat is Pseudomonas syringae pv. atrofaciens. In some countries, wheat yield losses caused by this phytopathogenic bacterium reach 50%. Currently, the taxonomy of P. syringae includes more than 50 pathovars with varying degrees of adaptation to wheat lesions. One of them is Pseudomonas syringae pv. сoronafaciens. P. syringae pv. Coronafaciens is non-host pathogen for wheat. However, the infectionsof a wide range of crops, including wheat, with this pathogen attracts the attention of both researchers and specialiss of the agro-industrial complex. The study of the mechanisms of wheat resistance to host and non-host pathovars of P. syringae is of great interest, both in terms of in-depth study of the pathogen and in the perspective of selection of bacterial disease-resistant varieties of this strategically important grain crop for Ukraine. The aim of the study was to compare the antioxidant reactions of wheat seedlings of different winter wheat varieties under the grain exposition to P. syringae of different pathovars and their lipopolysaccharides (LPS). It was found that reactive oxygen species generation, as a mechanism of plant immune protection against phytopathogenic pseudomonads, is equally activated in the case of exposure to both host and nonhost pathovars and to a lesser extent in the case of the exposure with LPS of both pathovars. In grains of Favoritka variety (most sensitive to phytopathogenic pseudomonads) exposed to host pathovar, significant activation of antioxidant enzymes was observed. Exposure to the non-host pathovar causes sharp proline accumulation. Thus, the sensitivity of wheat seedlings to phytopathogenic host and non-host pathovars ofphytopathogenic pseudomonads largely depends on the balanced functioning of the antioxidant defense system. Taken together, these data indicate the wheat cell oxidative metabolism as a target for selection of varieties resistant to phytopathogenic bacteria.