Photosynthetica 2004, 42(1):1-6 | DOI: 10.1023/B:PHOT.0000040562.34339.b3

Gas Exchange and Chlorophyll Fluorescence Response to Simulated Rainfall in Hedysarum fruticosum var. mongolicum

S.L. Niu1, L.H. Li1, G.M. Jiang1, L.M. Gao1, Y.G. Li1, Y. Peng1, M.Z. Liu1
1 Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Beijing, P.R. China

The response of gas exchange and chlorophyll fluorescence along with changes in simulated rainfall were studied in water stressed plants Hedysarum fruticosum var. mongolicum (H.f.m.). Net photosynthetic rate (PN), stomatal conductance (gs), leaf water potential (Ψleaf), and apparent carboxylation efficiency (PN/Ci) were significantly increased with the increase of rainfall. However, they did not change synchronously. The complete recovery of both PN and PN/Ci appeared 3 d after watering while gs and Ψleaf were recovered 1 d after treatment. Gas exchange characters increased sharply from 5 to 15 mm rainfall and then maintained steady state with increasing rainfall. During the initial phase of water recovery, photosystem 2 (PS2) activity was not affected and its complete recovery occurred also 3 d after rainfall. Hence the recovery of PN was attributed to both opening of stomata and increase in carboxylation efficiency. Furthermore, PS2 activity was really impaired by water stress and could recover to the normal status when the water stress disappeared.

Additional key words: apparent carboxylation efficiency; gas exchange; leaf water potential; net photosynthetic rate; soil water content; stomatal conductance

Published: March 1, 2004  Show citation

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Niu, S.L., Li, L.H., Jiang, G.M., Gao, L.M., Li, Y.G., Peng, Y., & Liu, M.Z. (2004). Gas Exchange and Chlorophyll Fluorescence Response to Simulated Rainfall in Hedysarum fruticosum var. mongolicum. Photosynthetica, 42(1), 1-6. doi: 10.1023/B:PHOT.0000040562.34339.b3
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