Alternative or cytochrome? Respiratory pathways in traps of aquatic carnivorous bladderwort Utricularia reflexa

0563247 - BÚ 2023 RIV US eng J - Journal Article
Pavlovič, A. - Jakšová, J. - Hrivňacký, M. - Adamec, Lubomír
Alternative or cytochrome? Respiratory pathways in traps of aquatic carnivorous bladderwort Utricularia reflexa.
Plant Signaling & Behavior. Roč. 17, č. 1 (2022), č. článku 2134967. ISSN 1559-2316. E-ISSN 1559-2324
Institutional support: RVO:67985939
Keywords : Alternative oxidase * cytochrome c oxidase * respiration
OECD category: Biochemistry and molecular biology
Impact factor: 2.9, year: 2022
Method of publishing: Open access
https://doi.org/10.1080/15592324.2022.2134967

Carnivorous plants of the genus Utricularia (bladderwort) form modified leaves into suction bladder traps. The bladders are metabolically active plant tissue with high rates of mitochondrial respiration (R-D). In general, plants possess two mitochondrial electron transport pathways to reduce oxygen to water: cytochrome and an alternative. Due to the high metabolic rate in the bladders, it is tempting to assume that the bladders prefer the cytochrome c oxidative pathway. Surprisingly, we revealed that alternative oxidase (AOX), which yields only a little ATP, is much more abundant in the bladders of Utricularia reflexa in comparison with the shoots. This pattern is similar to the carnivorous plants with passive pitcher traps (e.g. Sarracenia, Nepenthes) and seems to be widespread across many carnivorous taxa. The exact role of AOX in the traps of carnivorous plants remains to be investigated.
Permanent Link: https://hdl.handle.net/11104/0335608