Estiarte M., Peñuelas J., Kimball B.A., Idso S.B., Lamorte R.L., Pinter P.J., Wall G.W., Garcia R.L. (1994) Elevated CO2 effects on stomatal density of wheat and sour orange trees. Journal of Experimental Botany. 45: 1665-1668.EnllaçDoi: 10.1093/jxb/45.11.1665
No significant differences were found in stomatal densities or stomatal indices of wheat or sour orange trees grown at high CO2 concentrations in two different CO2 enrichment systems (Free-Air CO2 Enrichment for wheat and Open-Top Chambers for orange trees). These results are in accordance with most of the previous results obtained in short-term experimental studies which suggest that plants do not acclimate to increasing CO2 concentration by changing stomatal density within a single generation. © 1994 Oxford University Press.
Filella I, Peñuelas J (1994) The red edge position and shape as indicators of plant chlorophyll content and biomass. International Journal of Remote Sensing 15:1459-1470.
Peñuelas J (1994) Why terrestrial vegetation tends to have a leaf area index of 4? Spectrum 18:74-75.
Peñuelas J, Matamala R (1994) Elemental composition of beans and peppers under nitrogen and water-stress. Plant Physiology (Life Science Advances) 13:273-278.
Duarte CM, Planas D, Peñuelas J (1994) Macrophytes, taking control of an ancestral home. In Margalef R (ed) Limnology. Elsevier, pp 59-79.
Peñuelas J, Ribas M, González M, Azcón-Bieto J (1994) Respiration responses in ozone fumigated spruces. Environmental and Experimental Botany 34:443-449.
Field, CB, Gamon JA, Peñuelas J (1994) Remote sensing of photosynthesis. In Schulze ED, Caldwell MM (eds) Ecophysiology of photosynthesis. Springer, pp. 511-527.
Peñuelas J, Gamon J, Freeden A, Merino J, Field C (1994) Reflectance indices associated with physiological changes in nitrogen- and water-limited sunflower leaves. Remote Sensing of Environment 48:135-146.
Estiarte M, Filella I, Serra J, Peñuelas J (1994) Effects of nutrient and water stress on leaf phenolic content of peppers and susceptibility to generalist herbivores (Helicoverpa armigera). Oecologia 99:392-396.
Peñuelas J., Ribas-Carbó M., González-Meller M., Azcón-Bieto J. (1994) Water status, photosynthetic pigments, C/N ratios and respiration rates of sitka spruce seedlings exposed to 70 ppbv ozone for a summer. Environmental and Experimental Botany. 34: 443-449.EnllaçDoi: 10.1016/0098-8472(94)90027-2
Three-year old seedling of Picea sitchensis (Bong.) Carr. were exposed in large-scale chambers (solardomes) to 70 ppbv O3 for an entire summer, 7 hr day-1, under approximately ambient conditions. No macro- or microscopic injury, no fluorescence differences and no growth rate effects were found in the fumigated spruce. However, fumigated seedlings showed significantly lowered water potentials, chlorophyll concentrations, nitrogen and sulfur contents, and respiration rates. The old needles had higher cyanide-resistant respiration. These results were consistent with symptoms of forest decline affecting high-altitude forest and showed the presence of physiological changes even though there were no visible symptoms. © 1994.
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