Is ATP a Signaling Agent in Plants?

Apyrases (Nucleoside Triphosphate-Diphosphohydrolases) Play a Key Role in Growth Control in Arabidopsis

“…As yet there are insufficient data to answer this question. The fact that submicromolar levels of eATP can induce signaling changes in plants (Demidchik et al, 2003;Song et al, 2006) would suggest that plants, like animals, have purinoceptors that can bind eATP with a high affinity and transduce that binding into transduction pathways. However, as discussed by Demidchik et al (2003), Roux et al (2006), and others, as yet no purinoceptor has been identified in plants.…”

“…The fact that submicromolar levels of eATP can induce signaling changes in plants (Demidchik et al, 2003;Song et al, 2006) would suggest that plants, like animals, have purinoceptors that can bind eATP with a high affinity and transduce that binding into transduction pathways. However, as discussed by Demidchik et al (2003), Roux et al (2006), and others, as yet no purinoceptor has been identified in plants. Thus, in parallel with the history of auxin, gibberellin, and other growth regulators in plants, evidence that eATP can influence growth is preceding the discovery of how its growth influence is initiated, whether that be by a receptor or by some other mechanism.…”

“…Plasma membrane-associated apyrases in plants could, in principle, function as ectoapyrases because plant cells, like animal cells, release significant quantities of ATP into their ECM when they are mechanically stimulated (Jeter et al, 2004), when they are wounded , and when they are engaged in activities that involve active secretion, such as growth (Kim et al, 2006). Moreover, control of this eATP could be important because plant cells have significant signaling responses to submicromolar ATP (Demidchik et al, 2003;Song et al, 2006) and extensive depletion of eATP can result in loss of cell viability (Chivasa et al, 2005).…”

Fluorescence Resonance Energy Transfer-Sensitized Emission of Yellow Cameleon 3.60 Reveals Root Zone-Specific Calcium Signatures in Arabidopsis in Response to Aluminum and Other Trivalent Cations

“…Since ATP has been shown to induce [Ca 2+ ] cyt increases in plants using methods such as aequorin (Demidchik et al, 2003;Jeter et al, 2004) (Fig. 1B), the ATP-induced increase in [Ca 2+ ]cyt was generally followed by a more gradual decline that spanned a period of approximately 3 to 5 min (Fig.…”

Variation potential in higher plants: Mechanisms of generation and propagation

“…In recent studies, 71 hydrogen peroxide (H 2 O 2 ) has been shown to propagate from the damage zone and induce an electrical reaction. It is known that H 2 O 2 can activate Ca 2C channels [72][73][74] that can trigger VP development (see below), and hydrogen peroxide molecules can be quickly synthesized and propagated when a plant is under stress. [75][76][77][78] These properties support the hypothesis of H 2 O 2 participation in VP transmission.…”