Abstract
New roles are emerging for nitric oxide (NO) besides senescence and defense. While NO itself is probably used as a chemical weapon in defense, in several examples the biosynthesis of NO is up-regulated so rapidly that a function of NO as a second messenger in signal transduction seems likely. We investigated this postulate with the signal substances cytokinin and polyamines. After polyamine addition to Arabidopsis seedlings, net NO biosynthesis increased with no apparent lag phase, and after zeatin addition, NO increased within 3 min. Thus, the up-regulation of NO levels is faster than activation of gene expression, consistent with our hypothesis of NO being a second messenger. A role for NO in signal transduction constitutes a new finding for both classes of signaling substances – polyamines and cytokinins. Cytokinin–polyamine crosstalk has already been indicated by known overlaps in the physiology of both signals, and the results reported here strengthen the case for this crosstalk. In addition, known multiple functions of polyamines in the physiology of pathogen defense, abiotic stress, hormones, and embryogenesis are already known to involve NO as a mediator. We discuss this new “input” into polyamine physiology.
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Scherer, G.F.E. (2006). Nitric Oxide in Cytokinin and Polyamine Signaling: Similarities and Potential Crosstalk. In: Lamattina, L., Polacco, J.C. (eds) Nitric Oxide in Plant Growth, Development and Stress Physiology. Plant Cell Monographs, vol 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/7089_2006_088
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