期刊
AMERICAN JOURNAL OF BOTANY
卷 97, 期 8, 页码 1272-1277出版社
WILEY
DOI: 10.3732/ajb.0900292
关键词
Bartonia virginica; C-13; carbon; Gentianaceae; mass spectrometry; mycorrhiza; mycoheterotrophy; N-15; Obolaria virginica; stable isotope
资金
- Natural Environment Research Council UK [NE/E014070/1]
- Mary Payne Hogan Botany Endowment at Old Dominion University
- NERC [NE/E014070/1] Funding Source: UKRI
- Natural Environment Research Council [NE/E014070/1] Funding Source: researchfish
Premise of the study : An estimated 10% of plant species have evolved to steal C from their symbiotic fungal partners (mycoheterotrophy), and while physiological evidence for full and partial mycoheterotrophy is well developed in the Orchidaceae and Ericaceae, it is lacking for the majority of other mycoheterotrophic taxa. The family Gentianaceae not only contains several lineages of achlorophyllous mycoheterotrophs, but also contains species that are putative partially mycoheterotrophic. The North American genera Bartonia and Obolaria (Gentianaceae) are green but have leaves reduced to scales or foliose bracts and so have ambiguous mycoheterotrophic status. Methods : We investigated the natural abundance C-13 and N-15 profiles of both genera along with total N and chlorophyll content and investigated mycorrhizal infection using light microscopy. Key results : The shoots of B. virginica were significantly more enriched in N-15 than the surrounding vegetation but not in C-13. In contrast, the shoots of O. virginica are not enriched in N-15 compared to the surrounding vegetation but were significantly enriched in C-13. Total N concentrations were significantly higher than the surrounding vegetation in B. virginica, while the collaroid roots of both species were infected by arbuscular mycorrhizal fungi. Conclusions : This microscopic evidence coupled with the natural abundance stable isotope profiles strongly suggests that both species are partially mycoheterotrophic. However, differences in the root-shoot stable isotopic patterns relative to surrounding vegetation between B. virginica and O. virginica are suggestive of the utilization of different physiological pathways or extent of commitment to mycoheterotrophic C gain.
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