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Background   Pseudomonas syringae  pv.  tabaci  ( Pst ), which is the pathogen responsible for tobacco wildfire disease, has received considerable attention in recent years. The objective of this study was to clarify the responses of photosystem I (PSI) and photosystem II (PSII) to  Pst  infection in tobacco leaves.    Results  The net photosynthetic rate (Pn) and carboxylation efficiency (CE) were inhibited by  Pst  infection. The normalized relative variable fluorescence at the K step ( W  k ) and the relative variable fluorescence at the J step ( V  J ) increased while the maximal quantum yield of PSII ( F  v / F  m ) and the density of  Q  A -reducing PSII reaction centers per cross section (RC/CSm) decreased, indicating that the reaction centers, and the donor and acceptor sides of PSII were all severely damaged after  Pst  infection. The PSI activity decreased as the infection progressed. Furthermore, we observed a considerable overall degradation of PsbO, D1, PsaA proteins and an over-accumulation of reactive oxygen species (ROS).    Conclusions  Photoinhibition and photoinhibition-like damage were observed under light and dark conditions, respectively, after  Pst  infection of tobacco leaves. The damage was greater in the dark. ROS over-accumulation was not the primary cause of the photoinhibition and photoinhibition-like damage. The PsbO, D1 and PsaA proteins appear to be the targets during  Pst  infection under light and dark conditions.    Electronic supplementary material  The online version of this article (doi:10.1186/s12870-016-0723-6) contains supplementary material, which is available to authorized users.

bmc plant biology

Photoinhibition and photoinhibition-like damage to the photosynthetic apparatus in tobacco leaves induced by pseudomonas syringae pv. Tabaci under light and dark conditions