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Integration of trap- and root-derived nitrogen nutrition of carnivorous Dionaea muscipula.
New Phytol. 205, 1320-1329 (2015)
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 DmAMT1 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 (15) N from root-absorbed (15) N/(13) C-glutamine into these traps, but not that of (13) C. 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.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Ammonium ; Glutamine ; Nitrogen (n) Nutrition ; Plant Carnivory ; Root : shoot Integration; Mineral Nutrients; Fagus-sylvatica; Use Efficiency; Plant-roots; N Uptake; Prey; Drosera; Absorption; Transport; Seedlings
ISSN (print) / ISBN 0028-646X
Journal New Phytologist
Quellenangaben Volume: 205, Issue: 3, Pages: 1320-1329
Publishing Place Hoboken
Reviewing status Peer reviewed
Institute(s) Institute of Biochemical Plant Pathology (BIOP)