Integration of trap‐ and root‐derived nitrogen nutrition of carnivorous Dionaea muscipula
| Autor: | Sönke Scherzer, Theresa Sofi Loeffler, Felix Bemm, Tim Burzlaff, Peng Gao, Rainer Hedrich, Ines Kreuzer, Jörg Kruse, Heinz Rennenberg, Anne Honsel, Franz Buegger, Elzbieta Krol |
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| Rok vydání: | 2014 |
| Předmět: |
inorganic chemicals
Insecta Nitrogen Physiology Molecular Sequence Data chemistry.chemical_element Plant Science Root system Biology Plant Roots Petiole (botany) chemistry.chemical_compound Nutrient Ammonium Compounds Botany Animals Nutritional Physiological Phenomena Ammonium Plant Proteins Carbon Isotopes Nitrogen Isotopes food and beverages shoot Integration [Ammonium Glutamine Nitrogen (n) Nutrition Plant Carnivory Root ] High capacity Plant Leaves chemistry Predatory Behavior Shoot Droseraceae |
| Zdroj: | New Phytol. 205, 1320-1329 (2015) |
| ISSN: | 1469-8137 0028-646X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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