Abstract
Chlorophyll fluorescence imaging has been used to analyse the response elicited in Phaseolus vulgaris after inoculation with Pseudomonas syringae pv. phaseolicola 1448A (compatible interaction) and P. syringae pv. tomato DC3000 (incompatible interaction). With the aim of modulating timing of symptom development, different cell densities were used to inoculate bean plants and the population dynamics of both bacterial strains was followed within the leaf tissue. Fluorescence quenching analysis was carried out and images of the different chlorophyll fluorescence parameters were obtained for infected as well as control plants at different timepoints post-infection. Among the different parameters analysed, we observed that non-photochemical quenching maximised the differences between the compatible and the incompatible interaction before the appearance of visual symptom. A decrease in non-photochemical quenching, evident in both infiltrated and non-infiltrated leaf areas, was observed in P. syringae pv. phaseolicola-infected plants as compared with corresponding values from controls and P. syringae pv. tomato-infected plants. No photoinhibitory damage was detected, as the maximum photosystem II quantum yield remained stable during the infection period analysed.
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Abbreviations
- Chl-F:
-
Chlorophyll fluorescence
- Chl-FI:
-
Chlorophyll fluorescence imaging
- cfu:
-
Colony forming units
- dpi:
-
Days post-inoculation
- ΦPSII :
-
Effective PSII quantum yield
- ΦPSII5 :
-
Effective PSII quantum yield at 5 s during the fluorescence induction kinetics
- FM′:
-
Maximum fluorescence in the light-adapted state
- FM :
-
Maximum fluorescence in the dark-adapted state
- F0 :
-
Initial fluorescence
- Ft :
-
Actual fluorescence any time during illumination with actinic light
- HR:
-
Hypersensitive response
- IF:
-
Infiltrated area
- LB:
-
Luria Bertani medium
- NIF:
-
Non-infiltrated area
- NPQ:
-
Non-photochemical quenching
- NPQ20 :
-
Non-photochemical quenching at 20 s during the fluorescence induction kinetics
- Pph:
-
Pseudomonas syringae pv. phaseolicola
- Pst:
-
Pseudomonas syringae pv. tomato
- PSII:
-
Photosystem II
- R :
-
Resistance genes
- RCI:
-
Real-colour images
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Acknowledgements
This project was supported by Spanish MEC grants AGL2002-02214 and BIO2004-04968-C02-02 to C.R. and M. B., respectively. The cooperation between the Spanish and the Czech groups was carried out in the frame of the Exchange Programme CSIC/Czech Academy of Sciences (projects 2003CZ0011 and 2004CZ0016). J. S. was supported by the Czech Ministry of Education, Sports and Youth (grant MSM6007665808) and the Czech Academy of Sciences (grant AVOZ60870520).
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Rodríguez-Moreno, L., Pineda, M., Soukupová, J. et al. Early detection of bean infection by Pseudomonas syringae in asymptomatic leaf areas using chlorophyll fluorescence imaging. Photosynth Res 96, 27–35 (2008). https://doi.org/10.1007/s11120-007-9278-6
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DOI: https://doi.org/10.1007/s11120-007-9278-6