Strategy of nitrogen acquisition and utilization by carnivorous Dionaea muscipula |
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Authors: | Jörg Kruse Peng Gao Anne Honsel Jürgen Kreuzwieser Tim Burzlaff Saleh Alfarraj Rainer Hedrich Heinz Rennenberg |
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Affiliation: | 1. Institut für Forstbotanik und Baumphysiologie, Universit?t Freiburg, Georges-Koehler-Allee 53/54, 79110, Freiburg, Germany 2. Umea Plant Science Center, Plant Physiology, Umea University, 901 87, Umea, Sweden 3. Forstzoologisches Institut, Universit?t Freiburg, Tennenbacher Strasse 4, 79085, Freiburg, Germany 4. Zoology Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia 5. Institute for Molecular Plant Physiology and Biophysics, University Wuerzburg, 97070, Wuerzburg, Germany
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Abstract: | Plant carnivory represents an exceptional means to acquire N. Snap traps of Dionaea muscipula serve two functions, and provide both N and photosynthate. Using 13C/15N-labelled insect powder, we performed feeding experiments with Dionaea plants that differed in physiological state and N status (spring vs. autumn plants). We measured the effects of 15N uptake on light-saturated photosynthesis (A max), dark respiration (R D) and growth. Depending on N status, insect capture briefly altered the dynamics of R D/A max, reflecting high energy demand during insect digestion and nutrient uptake, followed by enhanced photosynthesis and growth. Organic N acquired from insect prey was immediately redistributed, in order to support swift renewal of traps and thereby enhance probability of prey capture. Respiratory costs associated with permanent maintenance of the photosynthetic machinery were thereby minimized. Dionaea’s strategy of N utilization is commensurate with the random capture of large prey, occasionally transferring a high load of organic nutrients to the plant. Our results suggest that physiological adaptations to unpredictable resource availability are essential for Dionaea’s success with regards to a carnivorous life style. |
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