Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios

Wegener F, Beyschlag W, Werner C (2015)
Functional Plant Biology 42(7): 620-629.

Journal Article | Published | English

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Abstract
Organs of C-3 plants differ in their C isotopic signature (C-13). In general, leaves are C-13-depleted relative to other organs. To investigate the development of spatial C-13 patterns, we induced different C allocation strategies by reducing light and nutrient availability for 12 months in the Mediterranean shrub Halimium halimifolium L. We measured morphological and physiological traits and the spatial C-13 variation among seven tissue classes during the experiment. A reduction of light (Low-L treatment) increased aboveground C allocation, plant height and specific leaf area. Reduced nutrient availability (Low-N treatment) enhanced C allocation into fine roots and reduced the spatial C-13 variation. In contrast, control and Low-L plants with high C allocation in new leaves showed a high C-13 variation within the plant (up to 2.5 parts per thousand). The spatial C-13 variation was significantly correlated with the proportion of second-generation leaves from whole-plant biomass (R-2=0.46). According to our results, isotope fractionation in dark respiration can influence the C isotope composition of plant tissues but cannot explain the entire spatial pattern seen. Our study indicates a foliar depletion in C-13 during leaf development combined with export of relatively C-13-enriched C by mature source leaves as an important reason for the observed spatial C-13 pattern.
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Wegener F, Beyschlag W, Werner C. Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios. Functional Plant Biology. 2015;42(7):620-629.
Wegener, F., Beyschlag, W., & Werner, C. (2015). Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios. Functional Plant Biology, 42(7), 620-629.
Wegener, F., Beyschlag, W., and Werner, C. (2015). Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios. Functional Plant Biology 42, 620-629.
Wegener, F., Beyschlag, W., & Werner, C., 2015. Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios. Functional Plant Biology, 42(7), p 620-629.
F. Wegener, W. Beyschlag, and C. Werner, “Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios”, Functional Plant Biology, vol. 42, 2015, pp. 620-629.
Wegener, F., Beyschlag, W., Werner, C.: Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios. Functional Plant Biology. 42, 620-629 (2015).
Wegener, Frederik, Beyschlag, Wolfram, and Werner, Christiane. “Dynamic carbon allocation into source and sink tissues determine within-plant differences in carbon isotope ratios”. Functional Plant Biology 42.7 (2015): 620-629.
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