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Distinguishing carbon gains from photosynthesis and heterotrophy in C₃-hemiparasite-C₃-host-pairs

Title data

Giesemann, Philipp ; Gebauer, Gerhard:
Distinguishing carbon gains from photosynthesis and heterotrophy in C₃-hemiparasite-C₃-host-pairs.
In: Annals of Botany. Vol. 129 (12 May 2022) Issue 6 . - pp. 647-656.
ISSN 1095-8290
DOI: https://doi.org/10.1093/aob/mcab153

Abstract in another language

• 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.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: C₃ photosynthesis; heterotrophy; parasitic plant; xylem; stable isotopes ; ¹³C; ²H; ¹⁸O; Orobanchaceae; Santalaceae
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 580 Plants (Botany)
Date Deposited: 16 May 2022 07:00
Last Modified: 16 May 2022 07:00
URI: https://eref.uni-bayreuth.de/id/eprint/69610