Photosynthetic utilization of radiant energy by CAM Dendrobium flowers
1997
Khoo, G.H. | Hew, C.S. (National Univ. (Singapore). School of Biological Sciences) | He, J.
14CO2 fixation was observed in orchid Dendrobium flowers; its rate decreased with the flower development. The photochemical efficiency of photosystem 2 (PS2) (Fv/Fm) of a leaf was 14-21 % higher than that of a mature flower perianth (sepal, petal, and labellum) which had a much lower total Chl content and Chl a/b ratio. A higher quantum yield of PS2 (psi PS2) than in the mature flowers was observed in all green parts. Flower sepals had higher Chl content, Chl a/b ratio, and Fv/Fm values than the petal and labellum. During flower development the Chl content, Chl a/b ratio, Fv/Fm, and qN decreased while psiPS2 and qp remained constant.
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