Leaf thickness and carbon isotope composition in the Crassulaceae |
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Authors: | J. A. Teeri S. J. Tonsor M. Turner |
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Affiliation: | (1) Barnes Laboratory, The University of Chicago, 5630 South Ingleside Avenue, 60637 Chicago, Illinois, USA |
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Abstract: | Summary Measurements of leaf thickness and 13C value were obtained for twenty species and three intergeneric hybrids of the Crassulaceae. The data include plants growing in their native habitats and also in greenhouse cultivation. There is a strong relationship between leaf thickness and leaf 13C values. The plants with the thickest leaves of ca. 7 to 11 mm had 13C values ranging from -11.5 to -13.8. Plants with leaves that were thinner than 2.0 mm all had 13C values that were more negative than -23. Plants having intermediate leaf thickness possessed intermediate 13C values. The leaf tissue of four genotypes spanning the range of leaf thicknesses all exhibited a two-fold or greater nocturnal increase in titratable acidity. It appears that the differences in leaf thickness and 13C values among the tested species are genetically determined. |
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