Partial mycoheterotrophy in the arbuscular mycorrhizal Gentiana squarrosa (Gentianaceae) demonstrated by coculture assays using C
Yamato M, Sasuga M, Shimabukuro K, Kusakabe R, Suetsugu K
Mycorrhizal Networks
The delicate alpine gentians you might spot on a mountain hike aren't just pretty faces — they're quietly siphoning sugars from nearby plants through underground fungal threads, which means the health of an entire plant community shapes whether those gentians thrive or vanish.
Some plants can 'cheat' by pulling extra food through underground fungal threads that connect them to neighboring plants. Scientists proved this for a small gentian by growing it next to plants with a very distinctive carbon fingerprint — and then finding that fingerprint inside the gentian's leaves. Bigger, healthier gentians had absorbed more of this borrowed carbon, suggesting the 'cheating' actually helped them grow.
Key Findings
Gentiana squarrosa shoots had significantly higher δ¹³C values when connected via fungal networks to a C₄ companion plant versus a C₃ companion, directly demonstrating carbon transfer through the fungal network.
Shoot dry mass was strongly and positively correlated with δ¹³C enrichment among plants grown with C₄ companions, indicating that absorbed fungal-transferred carbon contributed measurably to plant growth.
A compartmentalized coculture system with nylon mesh barriers (hyphal passage only) minimized confounding CO₂ transfer pathways, making this one of the most controlled demonstrations of partial mycoheterotrophy in an AM-associated green plant to date.
chevron_right Technical Summary
Researchers proved that a small gentian plant can steal carbon from neighboring plants through shared fungal networks, even though it's green and photosynthesizes on its own. This challenges the assumption that green plants in these fungal networks are purely givers, not takers.
Abstract Preview
Partial mycoheterotrophy is a nutritional mode in which green plants supplement photosynthetically derived carbon with fungal carbon obtained from associated fungi. In green arbuscular mycorrhizal ...
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Gentiana is a genus of flowering plants belonging to the gentian family (Gentianaceae), the tribe Gentianeae, and the monophyletic subtribe Gentianinae. With over 300 species, it is considered a large genus. Gentians are notable for their mostly large trumpet-shaped flowers, which are often of an...