Synthesis and release of cyclic adenosine 3′:5′‐monophospliate by aquatic macrophytes

Abstract

G. 1981. Synthesis and release of cyclic adenosine 3':5'-monophosphate by aquatic macrophytes. -Physiol. Plant. 52: 33-36.Tissues from the aquatic macrophyte species Scirpus subterminalis, Najas flexilis, Ceralophyilum demersum, Polamogeton zosteriformis, and Nuphar advena contain cAMP in quantities similar to those reported in algae. Scirpus, Najas, and Ceralophyilum released cAMP into the extracellular media in quantities which varied interspecifically and intraspecifically m differing iBedia. Macrophytic release of cAMP may be an important source of dissolved cAMP in lakcwater.

Cyclic AMP interferes with pattern formation in the cyanobacterium Anabaena variabilis

“…It seems likely, though, that the overall response of cyanobacteria to nitrogen deprivation is complex, involving various regulators acting at different levels. In addition to the work described here, recent studies showing that cyclic AMP is synthesized and released by a wide variety of aquatic organisms [27], and that this nucleotide occurs naturally in lake waters, with levels fluctuating greatly during the growing season [28], suggest that cyclic AMP may 179 be of great significance in the regulation of metabolic and developmental processes in aquatic organisms.…”

Dissolved ATP turnover in the Bransfield Strait, Antarctica during a spring bloom

“…Excretion of AMP by bacteria is a welldocumented phenomenon (Chapman et al 1971, Leps & Ensign 1979, especially as a mechanism for the regulation of intracellular EC,. Cyclic AMP release has also been documented for cultures of phytoplankton (Bressan et al 1980, Francko & Wetzel 1981a and from aquatic macrophyte tissues (Francko & Wetzel 1981b). However, excretion of ATP has not been previously documented.…”

Development of a zooplankton community including Heterocope saliens Lillijeborg in an experiment with hydrophytes

“…This substance, affecting the activity of enzymes, regulates the biological function of hormones and neurotransmitters of aquatic organ isms. Ceratophyllum excretes cAMP into the extracel lular environment in amounts sufficient to change the interactions within and between species [21]. cAMP probably also influences the development and func tion of bacterial cells, which affects, through food chains, the structure of zooplankton.…”

“…It has been shown [24] that Ceratophyllum demersum changes the structure of the phytoplankton community, decreasing the propor tion of cyanobacteria in the total biomass of the phy toplankton and increasing the proportion of green algae. It has been found [21] that C. demersum is an important source of cyclic adenosine monophosphate (cAMP) in lake water. This substance, affecting the activity of enzymes, regulates the biological function of hormones and neurotransmitters of aquatic organ isms.…”