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Species-specific differences in temporal and spatial variation in delta super(13)C of plant carbon pools and dark-respired CO sub(2) under changing environmental conditions
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Species-specific differences in temporal and spatial variation in delta super(13)C of plant carbon pools and dark-respired CO sub(2) under changing environmental conditions
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Species-specific differences in temporal and spatial variation in delta super(13)C of plant carbon pools and dark-respired CO sub(2) under changing environmental conditions
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Journal Article
Species-specific differences in temporal and spatial variation in delta super(13)C of plant carbon pools and dark-respired CO sub(2) under changing environmental conditions
2012
Overview
Stable carbon isotope signatures are often used as tracers for environmentally driven changes in photosynthetic delta super(13)C discrimination. However, carbon isotope signatures downstream from carboxylation by Rubisco are altered within metabolic pathways, transport and respiratory processes, leading to differences in delta super(13)C between carbon pools along the plant axis and in respired CO sub(2). Little is known about the within-plant variation in delta super(13)C under different environmental conditions or between species. We analyzed spatial, diurnal, and environmental variations in delta super(13)C of water soluble organic matter ( delta super(13)C sub(WSOM)) of leaves, phloem and roots, as well as dark-respired delta super(13)CO sub(2) ( delta super(13)C sub(res)) in leaves and roots. We selected distinct light environments (forest understory and an open area), seasons (Mediterranean spring and summer drought) and three functionally distinct understory species (two native shrubs-Halimium halimifolium and Rosmarinus officinalis-and a woody invader-Acacia longifolia). Spatial patterns in delta super(13)C sub(WSOM) along the plant vertical axis and between respired delta super(13)CO sub(2) and its putative substrate were clearly species specific and the most delta super(13)C-enriched and depleted values were found in delta super(13)C of leaf dark-respired CO sub(2) and phloem sugars, -15 and -33 ppt, respectively. Comparisons between study sites and seasons revealed that spatial and diurnal patterns were influenced by environmental conditions. Within a species, phloem delta super(13)C sub(WSOM) and delta super(13)C sub(res) varied by up to 4 ppt between seasons and sites. Thus, careful characterization of the magnitude and environmental dependence of apparent post-carboxylation fractionation is needed when using delta super(13)C signatures to trace changes in photosynthetic discrimination.
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