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

AI Article Synopsis

  • Pseudomonas syringae pv. tabaci (Pst) causes tobacco wildfire disease, and this study investigates its effects on photosystem I (PSI) and photosystem II (PSII) in infected tobacco leaves.
  • The infection led to a decrease in the net photosynthetic rate and carboxylation efficiency, while various fluorescence metrics indicated severe damage to the reaction centers of PSII and a decline in PSI activity as the infection worsened.
  • Both light and dark conditions resulted in photoinhibition and related damage, with ROS accumulation noted, but it wasn't the main cause; instead, specific proteins (PsbO, D1, PsaA) were likely targeted during the infection.

Article Abstract

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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4727333PMC
http://dx.doi.org/10.1186/s12870-016-0723-6DOI Listing

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