Systemic changes in photosynthesis and reactive oxygen species homeostasis in shoots of Arabidopsis thaliana infected with the beet cyst nematode Heterodera schachtii

• DOI: 10.1111/mpp.12652
• Publication Date: 2017-12-14T14:02:52Z
• Authors: Mateusz Labudda; Elżbieta Różańska; Weronika Czarnocka; Mirosław Sobczak; Jolanta Maria Dzik
• Keywords: Heterodera schachtii

Photosynthetic efficiency and redox homeostasis are important for plant physiological processes during regular development as well defence responses. The second-stage juveniles of Heterodera schachtii induce syncytial feeding sites in host roots. To ascertain whether the syncytia alters photosynthesis metabolism reactive oxygen species (ROS), chlorophyll a fluorescence measurements antioxidant responses were studied Arabidopsis thaliana shoots on day inoculation at 3, 7 15 days post-inoculation (dpi). Nematode parasitism caused an accumulation superoxide hydrogen peroxide molecules infected plants 3 dpi, probably result observed down-regulation enzymes. These changes accompanied by increase RNA lipid oxidation markers. activities enzymes found to be enhanced infection content anthocyanins was elevated from dpi. parameter Rfd , defining vitality photosynthetic capacity leaves, decreased 11% only non-photochemical quenching (NPQ), indicating effectiveness photoprotection mechanisms, about 16% lower As infection, ultrastructure chloroplasts changed (large starch grains plastoglobules), more numerous larger peroxisomes mesophyll cells leaves. We postulate that joint action enzymes/molecules photochemical mechanisms leading maintenance promotes fine-tuning oxidative stress induced parasitic cyst nematodes.