Abstract
Ozone (O3) is important air pollutant inducing severe losses of horticultural production. Cultivars of the same species, but with different leaf colors, may differ in their ozone sensitivity. However, it has not been clarified yet if different leaf coloration influences such a sensitivity. In this study, two purple-leafed and two green-leafed cultivars of Pakchoi were selected for ozone fumigation (240 ± 20 nmol mol–1, 09:00–16:00 h). Elevated O3 decreased chlorophyll content, increased anthocyanin (Ant) content, damaged cell membrane integrity, enhanced antioxidative enzyme activities, depressed photosynthetic rate (P N) and stomatal conductance (g s), inhibited maximal quantum yield (Fv/Fm) and effective quantum yield [YII] of PSII photochemistry, and caused visible injury. Purple-leafed cultivars with higher Ant contents were more tolerant than green-leafed cultivars as indicated by lower relative enhancement in malondialdehyde content and lower relative losses in P N, g s, Fv/Fm, and YII. The higher ability to synthesize Ant in the purple-leafed cultivars contributed to their higher photoprotective ability.
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Abbreviations
- Ant:
-
anthocyanins
- APX:
-
ascorbate peroxidase
- CAT:
-
catalase
- Car:
-
carotenoids
- CF:
-
charcoal-filtered air
- C i :
-
intercellular CO2 concentration
- Chl:
-
chlorophyll
- E:
-
transpiration rate
- EC:
-
electrical conductivity
- ETR:
-
electron transport rate
- Fo :
-
minimal fluorescence of the dark-adapted state
- Fm :
-
maximal fluorescence of the dark-adapted state
- FM:
-
fresh mass
- Fv/Fm :
-
maximal efficiency of PSII photochemistry in the dark-adapted state
- g s :
-
stomatal conductance
- JG:
-
Jingguan
- MDA:
-
malondialdehyde
- MG:
-
Meiguan
- NPQ:
-
nonphotochemical quenching
- OTCs:
-
open top chambers
- P N :
-
net photosynthetic rate
- POD:
-
peroxidase
- qL:
-
coefficient of photochemical fluorescence quenching based on lake model
- qN:
-
coefficient of nonphotochemical fluorescence quenching
- qP:
-
coefficient of photochemical fluorescence quenching based on puddle model
- ROS:
-
reactive oxygen species
- SOD:
-
superoxide dismutase
- VOCs:
-
volatile organic compounds
- YII :
-
the effective quantum yield of PSII photochemistry
- YNPQ :
-
quantum yield of light-induced nonphotochemical fluorescence quenching
- YNO :
-
quantum yield of nonregulated heat dissipation and fluorescence emission
- ZY:
-
Ziyu
- ZZ:
-
Zizuan
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Acknowledgments
We thank Dr. Elena Paoletti at the National Research Council of Italy and Dr. Caihong Li at the Chinese Academy of Sciences for their kindly revisions of this manuscript. This study was financially supported by National Natural Science Foundation of China (31401895), Natural Science Foundation of Heilongjiang Province of China (C201221), and ‘Young Talents’ project and Doctoral Fund of Northeast Agricultural University of China (14Q10, 2012RCB36).
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Zhang, L., Xiao, S., Chen, Y.J. et al. Ozone sensitivity of four Pakchoi cultivars with different leaf colors: physiological and biochemical mechanisms. Photosynthetica 55, 478–490 (2017). https://doi.org/10.1007/s11099-016-0661-4
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DOI: https://doi.org/10.1007/s11099-016-0661-4