Environmental regulation of carbon isotope composition and crassulacean acid metabolism in three plant communities along a water availability gradient.

Oecologia
M Fernanda RicaldeLouis S Santiago

Abstract

Expression of crassulacean acid metabolism (CAM) is characterized by extreme variability within and between taxa and its sensitivity to environmental variation. In this study, we determined seasonal fluctuations in CAM photosynthesis with measurements of nocturnal tissue acidification and carbon isotopic composition (δ(13)C) of bulk tissue and extracted sugars in three plant communities along a precipitation gradient (500, 700, and 1,000 mm year(-1)) on the Yucatan Peninsula. We also related the degree of CAM to light habitat and relative abundance of species in the three sites. For all species, the greatest tissue acid accumulation occurred during the rainy season. In the 500 mm site, tissue acidification was greater for the species growing at 30% of daily total photon flux density (PFD) than species growing at 80% PFD. Whereas in the two wetter sites, the species growing at 80% total PFD had greater tissue acidification. All species had values of bulk tissue δ(13)C less negative than -20‰, indicating strong CAM activity. The bulk tissue δ(13)C values in plants from the 500 mm site were 2‰ less negative than in plants from the wetter sites, and the only species growing in the three communities, Acanthocereus tetragonus (Cactac...Continue Reading

References

Feb 14, 2002·Plant, Cell & Environment·J. C. Cushman, A. M. Borland
Mar 12, 2002·Journal of Experimental Botany·Antony N DoddKate Maxwell
May 20, 2004·Annals of Botany·Ulrich Lüttge
Sep 1, 1988·Oecologia·James R Ehleringer, Tamsie A Cooper
Jul 1, 2005·Functional Plant Biology : FPB·Klaus WinterJoseph A M Holtum
Jun 1, 2002·Functional Plant Biology : FPB·Joseph A M Holtum
Jun 1, 2002·Functional Plant Biology : FPB·Tahar TaybiAnne M Borland

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