Abstract
Industrial chicory, Cichorium intybus L., has rather poor early vigour under the typical early spring morning conditions of low temperatures and high light intensity. Screening tools are being developed to assess the cold tolerance/sensitivity of young industrial chicory plants under these conditions. Refinement of such tools requires better understanding of the plants’ physiological responses. In this paper we discuss the effects of growth temperature (GT), measurement temperature (MT), and measuring light intensity (ML) on the relaxation of the Kautsky curve. We chose the chicory variety ‘Hera’, as it is known to possess a good average early vigour. Young plants of the variety ‘Hera’ were grown at three temperatures (GT): 16°C (reference), 8°C (intermediate), and 4°C (cold stress). The dark relaxation kinetics were analyzed at different light intensities (ML) in combination with different measurement temperatures (MT). The three components of the nonphotochemical quenching process (NPQE, NPQT, and NPQI) were determined. NPQE was not affected by GT but was significantly affected by MT and ML. NPQT and NPQI were affected by all factors and their interactions. An acclimation effect for plants grown at low GT was detected. Acclimation resulted in lower NPQT and NPQI values. The halftime of the inhibition depending on NPQ (NPQI) was not affected by any of the factors investigated. Based on the data generated, we conclude that NPQI is a valuable parameter for screening the cold sensitivity of young industrial chicory plants.
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Abbreviations
- ANOVA :
-
analysis of variance
- Ax:
-
antheraxanthin
- Chl:
-
chlorophyll
- EC:
-
electrical conductivity
- Fo :
-
the minimum chlorophyll fluorescence in dark-adapted state
- Fm :
-
the maximum chlorophyll fluorescence in dark-adapted state
- Fm′:
-
maximum fluorescence after light induction
- htE:
-
halftime of the energy-dependent quenching
- htI:
-
halftime of the photoinhibition-dependent quenching
- htT:
-
halftime of the state-transition-dependent quenching
- GT:
-
growth temperature
- kP :
-
rate constant for PSII photochemistry
- LHC:
-
light-harvesting complex
- ML:
-
measurement light intensity
- MT:
-
measurement temperature
- NPQ:
-
nonphotochemical quenching of the chlorophyll fluorescence signal
- NPQE :
-
energy-dependent quenching
- NPQf :
-
fast nonphotochemical quenching
- NPQI :
-
photoinhibition-dependent quenching
- NPQT :
-
state-transition-dependent quenching
- PAM:
-
pulse amplitude modulated
- PAR:
-
photosynthetically active radiation
- PSI:
-
photosystem I
- PSII:
-
photosystem II
- qE :
-
energy-dependent quenching
- qI :
-
photoinhibition-dependent quenching
- qN :
-
nonphotochemical quenching coefficient of the Chl fluorescence signal
- qT :
-
state-transition-dependent quenching
- SE:
-
standard error
- Vx:
-
violaxanthin
- Zx:
-
zeaxanthin
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Acknowledgements
The authors thank Laurent Gevaert, Luc Van Gijseghem and Christian Hendrickx for their help with the measurements and the cultivation and maintenance of the plants. The authors also like to thank Assistant Professor E. Rosenqvist and Professor N. D’Ambrosio for useful discussions concerning the Chl a fluorescence parameters. Miriam Levenson is acknowledged for her English language review.
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Lootens, P., Devacht, S., Baert, J. et al. Evaluation of cold stress of young industrial chicory (Cichorium intybus L.) by chlorophyll a fluorescence imaging. II. Dark relaxation kinetics. Photosynthetica 49, 185–194 (2011). https://doi.org/10.1007/s11099-011-0025-z
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DOI: https://doi.org/10.1007/s11099-011-0025-z