Tag Archives: signaling
Nitric oxide in plants under abiotic stress: involvement in signaling networks
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1Yuriev Plant Production Institute, National Academy of Agrarian Sciences of Ukraine, Kharkiv;
2Poltava State Agrarian University, Poltava, Ukraine;
3National Scientific Center “Institute for Soil Science and
Agrochemistry Research named after O. N. Sokolovsky”, Kharkiv, Ukraine;
*e-mail: plant_biology@ukr.net
Received: 01 April 2026; Revised: 04 May 2026;
Accepted: 29 June 2026; Available on-line: 18 June 2026
Background. Nitric oxide (NO) is recognized as one of the most vital signaling molecules in plants, involved in the control of most physiological processes under normal and, especially, stress conditions. Objective. This review provides data on the primary and recently discovered minor pathways of nitric oxide synthesis in plants, NO-induced protein post-translational modifications, NO involvement in a general signaling network, interaction with individual nucleotides, stress-protective action of different NO donors and metabolic precursors of nitric oxide, along with the potential applications of these compounds in phytobiotechnologies. Conclusions. Despite numerous unresolved questions regarding nitric oxide synthesis and signaling in plants, current evidence highlights its central role in plant adaptation and stress responses, as well as the considerable potential of NO donors and related compounds for phytobiotechnological applications.
Action of methyl jasmonate and salt stress on antioxidant system of Arabidopsis plants defective in jasmonate signaling genes
Т. О. Yastreb1, Yu. E. Kolupaev1,2, N. V. Shvidenko1, A. P. Dmitriev3
1Dokuchaev Kharkiv National Agrarian University, Ukraine;
e-mail: plant_biology@ukr.net;
2Karazin Kharkiv National University, Ukraine;
3Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine, Kyiv;
e-mail: dmitriev.ap@gmail.com
Role of jasmonate signaling in the regulation of stress-protective systems in Arabidopsis under salt stress remains insufficiently studied. For its clarification, comparative studies with mutants lacking various protein components of jasmonate signaling are advisable. In this connection, effects of methyl jasmonate (MJ, 50 μM) and salt stress (NaCl, 150 mM) on functioning of antioxidant and osmoprotective systems of wild-type Arabidopsis plants (Col-0) and ones defective in jasmonate signaling, namely coi1 (mutant for gene coding the protein COI1, which participates in removal of repressor proteins of transcription factors of jasmonate signaling) and jin1 (mutant defective in gene encoding the transcription factor JIN1/MYC2, one of the key in jasmonate signaling), were investigated. Salt stress inhibited growth of plants of all three genotypes. Treatment with MJ before salt stress positively influenced only the growth of wild-type plants. In contrast to mutants coi1 and jin1, Col-0 plants treated with MJ, under conditions of salt stress, kept close to the control values of water and total chlorophylls content, and the content of carotenoids increased. The coi1 plants under normal conditions differed from wild-type plants and jin1 mutants by reduced activity of guaiacol peroxidase and catalase and increased proline content. Treatment with MJ did not affect the activity of antioxidant enzymes and proline content in both mutants defective in jasmonate signaling. Under salt stress, the activity of superoxide dismutase, catalase and guaiacol peroxidase, as well as the content of proline and anthocyanins, in wild-type plants treated with MJ, were significantly higher than in control plants. The role of jasmonate-dependent protective systems in resistance of Arabidopsis plants to salt stress is discussed.