Photosynthetica 2010, 48(3):370-376 | DOI: 10.1007/s11099-010-0048-x

Photosynthetic traits of Carex cinerascens in flooded and nonflooded conditions

M. Li1,2, G. Hou3, D. Yang1, G. Deng1, W. Li1,4,*
1 Laboratory of Aquatic Plant Biology, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, Hubei, P. R. China
2 Key Laboratory of Aquatic Botany and Watershed Ecology, Chinese Academy of Sciences, Wuhan, Hubei, P. R. China
3 College of Environment Sci. & Eng., Huazhong University of Sci. and Tech., Wuhan, P. R. China
4 Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan, Hubei, P. R. China

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.

Keywords: ANN; Carex cinerascens; photosynthesis

Received: June 5, 2009; Accepted: July 13, 2010; Published: September 1, 2010Show citation

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Li, M., Hou, G., Yang, D., Deng, G., & Li, W. (2010). Photosynthetic traits of Carex cinerascens in flooded and nonflooded conditions. Photosynthetica, 48(3), 370-376. doi: 10.1007/s11099-010-0048-x.
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