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- Title
Integration of trap- and root-derived nitrogen nutrition of carnivorous Dionaea muscipula.
- Authors
Gao, Peng; Loeffler, Theresa Sofi; Honsel, Anne; Kruse, Jörg; Krol, Elzbieta; Scherzer, Sönke; Kreuzer, Ines; Bemm, Felix; Buegger, Franz; Burzlaff, Tim; Hedrich, Rainer; Rennenberg, Heinz
- Abstract
Carnivorous Dionaea muscipula operates active snap traps for nutrient acquisition from prey; so what is the role of D. muscipula's reduced root system?, We studied the capacity for nitrogen (N) acquisition via traps, and its effect on plant allometry; the capacity of roots to absorb NO3−, NH4+ and glutamine from the soil solution; and the fate and interaction of foliar- and root-acquired N., Feeding D. muscipula snap traps with insects had little effect on the root : shoot ratio, but promoted petiole relative to trap growth. Large amounts of NH4+ and glutamine were absorbed upon root feeding. The high capacity for root N uptake was maintained upon feeding traps with glutamine. High root acquisition of NH4+ was mediated by 2.5-fold higher expression of the NH4+ transporter Dm AMT1 in the roots compared with the traps. Electrophysiological studies confirmed a high constitutive capacity for NH4+ uptake by roots. Glutamine feeding of traps inhibited the influx of 15N from root-absorbed 15N/13C-glutamine into these traps, but not that of 13C. Apparently, fed traps turned into carbon sinks that even acquired organic carbon from roots., N acquisition at the whole-plant level is fundamentally different in D. muscipula compared with noncarnivorous species, where foliar N influx down-regulates N uptake by roots.
- Subjects
VENUS'S flytrap; BIOLOGICAL classification; SYMPATRIC speciation; CARBON products manufacturing; DEVELOPMENTAL biology
- Publication
New Phytologist, 2015, Vol 205, Issue 3, p1320
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.13120