Dark respiration and photosynthesis of dormant and sprouting turions of aquatic plants

0369563 - BÚ 2012 RIV DE eng J - Journal Article
Adamec, Lubomír
Dark respiration and photosynthesis of dormant and sprouting turions of aquatic plants.
Fundamental and Applied Limnology. Roč. 179, č. 2 (2011), s. 151-158. ISSN 1863-9135. E-ISSN 1863-9135
Institutional research plan: CEZ:AV0Z60050516
Keywords : Carnivorous and non-carnivorous plants * dormancy * storage function
Subject RIV: EF - Botanics
Impact factor: 1.145, year: 2011

Turions are overwintering, dormant organs, produced by aquatic plants. In the spring, aerobic dark respiration (RD) and photosynthetic rates (PN) were measured as criteria of metabolic activity and photosynthetic capacity in dormant turions of 7 temperate aquatic plant species. These rates were also measured in old, original turion segments and in the newly formed shoots of sprouting turions. Two non-carnivorous rooting species (Caldesia parnassifolia, Hydrocharis morsus-ranae) and 5 carnivorous rootless species (Aldrovanda vesiculosa, Utricularia vulgaris, U. australis, U. stygia, U. bremii) were studied. RD values of dormant turions per unit fresh weight (range 1.1-5.4 mmol kg-1FW h-1) were significantly lower (1.9-13 times) for all species, except A. vesiculosa, than those for old segments of sprouting turions (range 5.2-14 mmol kg-1FW h-1). Turions of aquatic plants also function as important storage organs for mineral nutrients (N, P, S and Mg) to ensure the growth of new organs.
Permanent Link: http://hdl.handle.net/11104/0203595