0381666 - BC 2013 RIV DE eng J - Článek v odborném periodiku
Borovec, Jakub - Sirová, Dagmara - Adamec, Lubomír
Light as a factor affecting the concentration of simple organics in the traps of aquatic carnivorous Utricularia species.
Fundamental and Applied Limnology. Roč. 181, č. 2 (2012), s. 159-166. ISSN 1863-9135. E-ISSN 1863-9135
Grant CEP: GA ČR(CZ) GAP504/11/0783
Výzkumný záměr: CEZ:AV0Z60050516
Institucionální podpora: RVO:60077344
Klíčová slova: Utricularia * trap fluid * organic compounds
Kód oboru RIV: EF - Botanika
Impakt faktor: 1.190, rok: 2012

Rootless aquatic carnivorous Utricularia plants exude significant amounts of photosynthates into the trap fluid, where they have been shown to support complex microbial commensal communities. Using ion chromatography, the composition of four groups of easily metabolised, carbon-rich organic compounds (sugars, sugar alcohols, amino acids and organic acids) was investigated in trap fluid collected from three aquatic Utricularia species, U. vulgaris, U. reflexa and U. stygia, for different trap ages, irradiance levels during plant growth and for exposure to periods of darkness. The total sum of the concentrations of the four groups of organic compounds in the trap fluid ranged within 14 – 42 mg/L in greenhouse-grown U. vulgaris, compared to 9.0 –14 mg/L in U. reflexa. The concentrations of organic compounds were significantly higher in younger traps than in the older traps of U. vulgaris grown at high irradiance. Within the same trap age categories in U. vulgaris, the group concentrations of sugars, organic acids, and total sums of analysed compounds were significantly higher in plants growing at high irradiance when compared with those grown in the shade. Dark exposure of cut traps for 1– 2 d significantly decreased the concentrations of sugars and organic acids in the fluid. The total sum of organic compounds in traps of U. stygia grown outdoors (78.3 +- 19.2 mg/L) was much higher than that in ‘middle aged’ traps of U. vulgaris (49.2 +- 4.2 mg/L), grown under the same conditions. It may be concluded that the concentrations of organic compounds in the trap fluid of aquatic Utricularia are species specific, subject to rapid turnover and depend significantly on various endogenous (trap age) or exogenous factors (water chemistry, irradiance).
Trvalý link: http://hdl.handle.net/11104/0212082