Helminthosporiosis Impact on the Photosynthetic Apparatus and the Oxydative Status of Barley Seedlings at Different Stages of Development

Background: In recent years, spot blotch, a disease caused by Bipolaris sorokiniana (Sacc.) Shoem., has emerged as serious concern with regard to spring barley cultivation. However, the effect of this pathogen on photosynthetic apparatus and oxidative status plants at different stages chloroplast development hardly been studied. Aims / Methods: The study aimed evaluate protective system barley’s ( Hordeum vulgare L.) response Shoem. (B.S.) biogenesis. green seedlings ages (3-11 days) were treated fungal spores (10 6 spores×ml −l ). first leaves analyzed 24 or 48 hours after inoculation pathogen. Results: Differences in infection identified leaf tissues containing chloroplasts development. differences manifested themselves non-photochemical quenching (NPQ) absorbed energy, total content reactive oxygen species (ROS), lipid peroxidation (LPO) activity polyphenol content. An increase peroxidase (POX) infected anabolic stage biogenesis its decrease catabolic against background constant ascorbate (APX) revealed. A high positive correlation between chlorophyll malondialdehyde (MDA) was observed. Conclusion: ages, contamination is PS II activity, general ROS polyphenols, well LPO activity. parameters may be useful tool control plant immunity view breeding novel technologies.