Abstract
Gas exchange of Carex cinerascens was carried out in Swan Islet Wetland Reserve (29°48′ N, 112°33′ E). The diurnal photosynthetic course of C. cinerascens in the flooded and the nonflooded conditions were analyzed through the radial basis function (RBF) neural network approach to evaluate the influences of environmental variables on the photosynthetic activity. The inhibition of photosynthesis induced by soil flooding can be attributed to the reduced stomatal conductance (g s), the deficiency of Rubisco regeneration and decreased chlorophyll (Chl) content. As revealed by analysis of artificial neural network (ANN) models, g s was the dominant factor in determining the photosynthesis response. Weighting analysis showed that the effect of water pressure deficit (VPD) > air temperature (T) > CO2 concentration (C a) > air humidity (RH) > photosynthetical photon flux density (PPFD) for the nonflooded model, whereas for the flooded model, the factors were ranked in the order VPD > C a > RH > PPFD > T. The different photosynthetic response of C. cinerascens found between the nonflooded and flooded conditions would be useful to evaluate the flood tolerance at plant species level.
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Abbreviations
- ANN:
-
artificial neural network
- AQY:
-
apparent quantum yield
- C a :
-
CO2 concentration
- C i :
-
intercellular CO2 concentration
- CE:
-
carboxylation efficiency
- Chl:
-
chlorophyll
- E :
-
transpiration rate
- ETR:
-
electron transport rate
- Fm :
-
maximum fluorescence of dark state
- Fm′:
-
maximum fluorescence of light-adapted state
- Fo :
-
minimum fluorescence of dark state
- Fo′:
-
minimum fluorescence of light-adapted state
- Fs :
-
steady-state fluorescence
- Fv :
-
variable fluorescence
- Fv/Fm :
-
maximum quantum yield of PSII
- Fv/Fo :
-
the ratio of variable fluorescence to minimum fluorescence
- g s :
-
stomatal conductance
- Jmax :
-
the light saturated rate of electron transport
- Lc:
-
light compensation point
- Ls:
-
light saturation point
- P N :
-
net photosynthetic rate
- PAR:
-
photosynthetically active radiation
- PPFD:
-
photosynthetic photon flux density
- PSII:
-
photosystem II
- qN :
-
non-photochemical quenching coefficient
- qP :
-
photochemical quenching coefficient
- R D :
-
dark respiration rate
- R day :
-
day respiration
- RBF:
-
radial basis function
- RH:
-
air humidity
- Rubisco:
-
ribulose-1,5-bisphosphate carboxylase/oxygenase
- T:
-
air temperature
- Tl :
-
leaf temperature
- Vcmax :
-
maximum rate of carboxylation
- VPD:
-
water-pressure deficit
- WUE:
-
water-use efficiency
- ΦPSII :
-
effective quantum yield of PSII
- Γ:
-
CO2 compensation point
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Acknowledgement
This work was financed by Innovation Key project of CAS (O754551B 03), Innovation Key project of CAS (KSCX2-YW-Z-1023-5), grant (30700083) from Natural Sciences Foundation of China and project (CN2357) funded by WWF.
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Li, M., Hou, G., Yang, D. et al. Photosynthetic traits of Carex cinerascens in flooded and nonflooded conditions. Photosynthetica 48, 370–376 (2010). https://doi.org/10.1007/s11099-010-0048-x
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DOI: https://doi.org/10.1007/s11099-010-0048-x