Regulation of the investment in carnivory in three aquatic Utricularia species: CO2 or prey availability?

0447905 - BÚ 2016 RIV AT eng J - Článek v odborném periodiku
Adamec, Lubomír
Regulation of the investment in carnivory in three aquatic Utricularia species: CO2 or prey availability?
Phyton. Annales Rei Botanicae. Roč. 55, č. 1 (2015), s. 131-148. ISSN 0079-2047
Grant CEP: GA ČR(CZ) GAP504/11/0783
Institucionální podpora: RVO:67985939
Klíčová slova: Aquatic carnivorous plants * growth experiment * foliar N and P content
Kód oboru RIV: EF - Botanika
Impakt faktor: 0.442, rok: 2015

he structural investment in carnivory (IIC) as a relative proportion of trap biomass (DW) was investigated in three aquatic Utricularia species (U. vulgaris, U. australis, U. reflexa) in a 12-14 d greenhouse growth experiment. The two-factorial experiment included the presence or absence of prey (zooplankton) for a high (0.30-0.58 mM) or low (0.024-0.062 mM) CO2 concentration in the culture water. Various plant growth parameters, including traps and foliar N and P contents in young shoot segments, were estimated. Generally, under a surplus CO2 and favourable light conditions, the trap production as the IIC in aquatic Utricularia is supported by prey capture more (positive feedback) than the apical shoot growth, but the IIC apparently does not depend on the very low shoot N or P content. At medium CO2 concentration, shoot N and P contents are very variable and regulate the IIC by negative feedback (“nutrient” regulation). Under poor photosynthetic conditions, however, the trap production is blocked by a shortage of photosynthates, which are allocated preferentially to shoot apices and branching, but probably also by the very high shoot N and P content. The regulation of trap production in Utricularia therefore includes two components. High CO2 concentration as the crucial prerequisite for high photosynthetic rate (“photosynthetic” regulation) is superior to the negative feedback regulation by tissue N or P content in young shoot segments.
Trvalý link: http://hdl.handle.net/11104/0249692