Phenology of glucosinolate concentrations in roots,stems and leaves of Cardamine cordifolia |
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Authors: | James E. Rodman Svaťa M. Louda |
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Affiliation: | 1. Department of Biology, Yale University, New Haven, CT 06511, U.S.A.;2. School of Life Sciences, University of Nebraska, Lincoln, NE 68588, U.S.A.;1. Rocky Mountain Biological Laboratory, Gothic, CO 81224 U.S.A. |
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Abstract: | Total concentrations of isothiocyanate-yielding glucosinolates (IYG) were measured in roots, stems, basal leaves and cauline leaves of the herbaceous perennial Cardamine cordifolia (bittercress, Cruciferae), sampled at three sites in the Colorado Rockies during 1981. Significant variation in quantity was partitioned among plant parts, among sampling dates throughout the growing season, and among the three sites. Roots and basal leaves maintained high and similar concentrations of IYG through the season, while cauline leaves and stems showed seasonal declines, associated partly with flowering. Roots also consistently produced oxazolidinethione-yielding glucosinolates (hydroxylated analogues of IYG), whereas above-ground parts were variable for the presence of these compounds. Seasonal and plant-part variability in glucosinolate content and spatial patchiness of glucosinolate phenotypes contribute to the variation in herbivore occurrence and damage documented in previous studies of this native crucifer. |
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Keywords: | Cruciferae glucosinolates isothiocyanates oxazolidinethiones seasonality within-plant allocation herbivory |
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