Photosynthetica 2004, 42(1):65-70 | DOI: 10.1023/B:PHOT.0000040571.63254.c2

Photosynthesis, Transpiration, and Water Use Efficiency of Caragana microphylla, C. intermedia, and C. korshinskii

C.C. Ma1,2, Y.B. Gao1, H.Y. Guo1, J.L. Wang1
1 College of Life Science, Nankai University, Tianjin, P.R. China
2 Department of Biology, Huaibei Coal Normal College, Huaibei, P.R. China

In the order C. microphylla - C. intermedia - C. korshinskii, compensation irradiance, saturation irradiance, and optimum temperature for photosynthesis increased, net photosynthetic rate (PN) at low irradiance and low temperature decreased, optimum air humidity decreased, and PN at low air humidity increased. Daily cumulative value of PN increased while daily cumulative value of transpiration (E) decreased, and hence water use efficiency (WUE =PN/E) increased. Diurnal course of PN of C. microphylla was a double-peak curve, but the second peak in the curves of C. intermedia and C. korshinskii was not visible. These physiological characteristics are biological basis for the geographical distribution of these three Caragana species, and are in relation to water conditions of their habitats and distinctiveness in leaf hair of plant.

Additional key words: geographic distribution; growth and development; morphological structure; physio-ecological adaptation; water deficit; water regime

Published: March 1, 2004  Show citation

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Ma, C.C., Gao, Y.B., Guo, H.Y., & Wang, J.L. (2004). Photosynthesis, Transpiration, and Water Use Efficiency of Caragana microphylla, C. intermedia, and C. korshinskii. Photosynthetica42(1), 65-70. doi: 10.1023/B:PHOT.0000040571.63254.c2
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