Photosynthetic characterization of Australian pitcher plant Cephalotus follicularis
- 269 Downloads
Australian carnivorous pitcher plant Cephalotus follicularis Labill. produces two types of leaves. During the spring time, the plant produces a foliage type of noncarnivorous leaf called lamina. Later, the second type of leaf is produced — carnivorous pitcher. Using simultaneous measurements of gas exchange and chlorophyll (Chl) fluorescence photosynthetic efficiency of these two distinct forms of leaves were compared. In addition stomatal density, an important component of gas exchange, and Chl concentration were also determined. Pitcher trap had lower net photosynthetic rate (P N) in comparison to noncarnivorous lamina, whereas the rate of respiration (R D) was not significantly different. This was in accordance with lower stomatal density and Chl concentration in the pitcher trap. On the other hand maximum quantum yield of PSII (Fv/Fm) and effective quantum yield of photochemical energy conversion in PSII (ΦPSII) was not significantly different. Nonphotochemical quenching (NPQ) was significantly higher in the lamina at higher irradiance. These data are in accordance with hypothesis that changing the leaf shape in carnivorous plants to make it a better trap generally makes it less efficient at photosynthesis. However, the pitcher of Cephalotus had much higher P N than it was expected from the data set of the genus Nepenthes. Because it is not possible to optimize for contrasting function such as photosynthesis and carnivory, it is hypothesized that Cephalotus pitchers are less elaborated for carnivorous function than the pitchers of Nepenthes.
Additional key wordscarnivorous plants Cephalotus chlorophyll chlorophyll fluorescence pitcher plants photosynthesis respiration stomatal density
minimal fluorescence in dark-adapted state
maximal fluorescence in dark-adapted state
maximal fluorescence in light-adapted state
maximal quantum yield of PSII
photosynthetic active radiation
net photosynthetic rate
maximal net rate of photosynthesis at saturating irradiance
rate of respiration
effective quantum yield of photochemical energy conversion in PSII
Unable to display preview. Download preview PDF.
This work was supported by grant VEGA 1/0040/09.
- Juniper, B.E., Robins, R.J., Joel, D.M.: The Carnivorous Plants. — Academic Press, London 1989.Google Scholar
- Knight, S.E.: Costs of carnivory in the common bladderwort, Utricularia macrorhiza. — Oecologia 89: 348–355, 1992.Google Scholar
- Lowrie, A.: Carnivorous Plants of Australia. — Vol. 3., Univ. Western Australia Press, Perth 1998.Google Scholar
- Mithöfer, A.: Carnivorous pitcher plants: insights in an old topic. — Phytochemistry: 2011, (In press.) doi:10.1016/j.phytochem.2010.11.024Google Scholar
- Peroutka, M., Adlassnig, W., Lendl, T., Pranjič, K., Lichtscheidl, I.K.: Functional biology of carnivorous plants. — In: Floriculture, Ornamental and Plant Biotechnology V: 266–286, Global Sci. Books, London 2008.Google Scholar
- Takahashii, K., Matsumoto, K., Nishii, W., Muramatsu, M., Kubota, K.: Comparative studies on the acid proteinase activities in the digestive fluids of Nepenthes, Cephalotus, Dionaea and Drosera. — Carniv. Plant Newslett. 38: 75–82, 2009.Google Scholar