Rootless Aquatic Plant Aldrovanda Vesiculosa: Physiological Polarity, Mineral Nutrition, and Importance of Carnivory |
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Authors: | L Adamec |
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Institution: | (1) Institute of Botany of the Academy of Sciences of the Czech Republic, Section of Plant Ecology, Dukelská 135, CZ-379 82 Tebo, Czech Republic e-mail |
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Abstract: | Various ecophysiological investigations are presented in Aldrovanda vesiculosa, a rootless aquatic carnivorous plant. A distinct polarity of N, P, and Ca tissue content per dry mass (DM) unit was found along Aldrovanda shoots. Due to effective re-utilization, relatively small proportions of N (10 – 13 %) and P (33 – 43 %) are probably lost with senescent leaf whorls, while there is complete loss of all Ca, K, and Mg. The total content of starch and free sugars was 26 – 47 % DM along adult shoots, with the maximum in the 7th – 10th whorls. About 30 % of the total maximum sugar content was probably lost with dead whorls. The plant was found to take up 5 – 7 times more NH4
+ to NO3
– from a mineral medium. Under nearly-natural conditions in an outdoor cultivation container, catching of prey led to significantly more rapid growth than in unfed plants. DM of the fed controls was 48 % higher than in the unfed plants. The controls produced 0.69 branches per plant, while the unfed plants did not produced any. However, the N and P content per DM unit increased by 6 – 25 % in the apices and the first 6 whorls in the unfed variant, as compared to the fed controls. It may be suggested that carnivory is very important for Aldrovanda. |
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Keywords: | apical shoot growth basal shoot senescence growth effect of carnivory mineral and sugar content NH4
+ NO3
– HPO4
2– uptake |
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