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Giesemann, Philipp ; Gebauer, Gerhard:
Distinguishing carbon gains from photosynthesis and heterotrophy
in C₃-hemiparasite-C₃-host-pairs.
In: Annals of Botany.
Bd. 129
(2022)
Heft 6
.
- S. 647-656.
ISSN 1095-8290
DOI: https://doi.org/10.1093/aob/mcab153
Abstract
• Background and Aims Previous carbon stable isotope (13C) analyses showed for very few C3-hemiparasites utilizing C4- or CAM-hosts a usage of two carbon sources, autotrophy and heterotrophy. This 13C approach, however, failed for the frequently occurring C3-C3 parasite-host-pairs. Thus, we used hydrogen stable isotope (2H) natural abundances as substitute for 13C within a C3 Orobanchaceae-sequence graded by haustoria complexity and C3 Santalaceae.
• Methods Parasitic plants and their real or potential host plants as references were collected in Central European lowland and alpine mountain meadows and forests. Parasitic plants included the xylem-feeding holoparasite Lathraea squamaria parasitizing on the same carbon nutrient source (xylem-transported organic carbon compounds) as potentially Pedicularis, Rhinanthus, Bartsia, Melampyrum, Euphrasia hemiparasites. Reference plants were used for an autotrophy-only isotope baseline. A multi-element stable isotope natural abundance approach was applied.
• Key Results Species-specific heterotrophic carbon gain ranging from 0 to 51 % was estimated by a 2H mixing-model. The sequence in heterotrophic carbon gain mostly met the morphological grading by haustoria complexity: Melampyrum- < Rhinanthus- < Pedicularis-type.
• Conclusion Due to higher transpiration and lower water-use efficiency, depletion in 13C, 18O and 2H compared to C3-host plants should be expected for tissues of C3-hemiparasites. However, 2H is counterbalanced by transpiration (2H-depletion) and heterotrophy (2H-enrichment). Progressive 2H-enrichment can be used as a proxy to evaluate carbon gains from hosts.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | C₃ photosynthesis; heterotrophy; parasitic plant; xylem; stable isotopes ; ¹³C; ²H; ¹⁸O; Orobanchaceae; Santalaceae |
| Institutionen der Universität: | Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Forschungseinrichtungen Forschungseinrichtungen > Zentrale wissenschaftliche Einrichtungen |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 580 Pflanzen (Botanik) |
| Eingestellt am: | 16 Mai 2022 07:00 |
| Letzte Änderung: | 03 Nov 2023 07:34 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/69610 |