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Nitric oxide (NO) gas is a small molecule with a high reactivity of the resulting radical character. NO in plant cells can be enzymatically synthesized from L -arginine in a reaction catalysed by the enzyme nitric oxide synthase activity or nitrite in a reaction catalyzed by nitrate reductase . It is also possible via non-enzymatic synthesis of NO . The results of the past years have shown a role in the regulation of signal range of physiological processes ranging from seed germination and ending on aging plants . It is also known feature of this compound in the regulation of plant responses to abiotic stresses (heavy metals, salinity , drought, lack of oxygen ) and biotic ( pathogen attack ) . In view of the prevalence of such a broad spectrum of activity , and there must be precise mechanisms that regulate the concentration of NO in cells. These include, in addition to the synthetic reaction of NO removal processes dependent on the presence in the cells of the NO -binding compounds , such as glutathione or hemoglobin . Niesymbiotyczne hemoglobin proteins are widely distributed in the plant kingdom . Experiments conducted in the past five years have proven that niesymbiotyczne hemoglobin in plant cells responsible for the modulation signal of NO and participate in the prevention of stress nitrozacyjnemu , associated with the accumulation of reactive nitrogen . The purpose of this paper is to discuss the importance of post- translational modification of proteins by NO, consisting of tyrosine nitration and S - nitrosylation of cysteine ​​in the regulation of physiological processes of plants. A decision was also an attempt to characterize hemoglobin niesymbiotycznych participate in the regulation of the NO concentration in the plant cells under conditions of oxygen deficiency periodic . Describes the operation cycle of hemoglobin / NO to ensure the maintenance of homeostasis in plants under abiotic stresses .

The Editorial Board
Andrzej Łukaszyk - przewodniczący, Zofia Bielańska-Osuchowska, Szczepan Biliński, Mieczysław Chorąży, Aleksander Koj, Włodzimierz Korochoda, Leszek Kuźnicki, Aleksandra Stojałowska, Lech Wojtczak

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Katedra i Zakład Histologii i Embriologii Uniwersytetu Medycznego w Poznaniu, ul. Święcickiego 6, 60-781 Poznań, tel. +48 61 8546453, fax. +48 61 8546440, email:

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