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Original Articles

The Changes in Some Photosynthetic Characteristics of Transgenic Tobacco Plants, Resistant to Bacteria Pseudomonas Syringae pv. Tabaci

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Pages 74-84 | Published online: 15 Apr 2014
 

ABSTRACT

The changes in the photosynthetic reactions of tobacco plants, infected by Pseudomonas syringae pv. tabaci were investigated. The protection against pathogen were studied in sensitive to wildfire disease tobacco plants—Nevrokop 1146 (N1146) and pigment deficient “aurea-like mutant”, A1146. The responses were compared with a transgenic resistant line of Nevrokop 1146 - (T1146) developed by Batchvarova et al, (1998) and carrying the ttr (tabtoxin resistance) gene. The changes in thylakoid electron transport, especially on PS2, were evaluated by induction curves of variable and the delayed fluorescence. Correlation with some changes in enzymatic processes related to fast and slow protection against pathogen was also investigated. More expressed effects of infection on photosynthesis in N1146 and A1146 than in T1146 were probably due to the direct tabtoxin action on both chlorophyll a and b. The hypersensitive reaction was expressed during the initial stages of the bacterial infection as evaluated by enhanced peroxidase activity. The increase in reduced sugars and α—amylase activity was related to development of later stages of protection against pathogen. The investigations showed that the changes in the photosynthetic apparatus could not only be correlated to the tabtoxin action and thence limited photorespiration. The resistant T1146 did not develop typical disease symptoms because of the limited tabtoxin action but pathogen induced changes in photosynthesis were obtained. The differences in the effects in N1146 and A1146 were probably due to their possible different chloroplast structure.

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