Induction of hypersensitive necrosis at high temperatures by generation of reactive oxygen forms in virus resistant tobacco

Király Lóránt: Induction of hypersensitive necrosis at high temperatures by generation of reactive oxygen forms in virus resistant tobacco. In: Acta biologica Szegediensis, (49) 1-2. pp. 85-87. (2005)

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Tobacco (Nicotiana tabacum cv. Xanthi nc) resistant to Tobacco mosaic virus (TMV) displays a hypersensitive response (HR) following virus infection, characterized by localized necrotic lesions around infection sites at ambient temperatures (e.g. 20°C). We have demonstrated that application of chemical compounds that generate reactive oxygen species (ROS), such as the riboflavin/methionine and glucose/glucose oxidase systems or H2O2 treatment induce HR-type necroses in leaves of Xanthi-nc tobacco infected with TMV even at high temperatures (30°C), when both necrosis and virus resistance are impaired. It was possible to suppress chemically induced HR-type necrotization at 30°C by application of antioxidants like superoxide dismutase (SOD) and catalase (CAT). Importantly, high TMV levels at 30°C did not differ in infected plants, regardless of the presence or absence of HR-type necrotization. Levels of one of the ROS, superoxide (O2·-), activity of NADPH-oxidase and expression of a tobacco NADPH-oxidase gene responsible for O2·-production were significantly lower in leaves of infected and healthy Xanthi-nc tobacco at 30°C, as compared to 20°C. It is concluded that development of HR-type necroses caused by TMV infection depends on a certain level of superoxide and other ROS, while suppression of virus multiplication in resistant tobacco is associated with low temperature but seems to be independent of HR-type necrotization.

Item Type: Article
Heading title: Stress biology; Proceedings
Journal or Publication Title: Acta biologica Szegediensis
Date: 2005
Volume: 49
Number: 1-2
ISSN: 1588-385X
Page Range: pp. 85-87
Language: English
Event Title: Hungarian Congress on Plant Physiology, 8., 2005, Szeged, Hungarian Conference on Photosynthesis, 6., 2005, Szeged
Related URLs:
Uncontrolled Keywords: Természettudomány, Biológia
Additional Information: Bibliogr.: p. 86-87.; Abstract
Date Deposited: 2016. Oct. 17. 09:24
Last Modified: 2021. Apr. 13. 11:07

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