Abstract
Aim. This study aimed to characterize the role of the jasmonate signaling pathway in flowering genes response to acute and chronic ionizing irradiation in plants. Methods. We used the wild-type Arabidopsis thaliana and jasmonic pathway defective jin mutant of Col0 ecotype in our experiments. The chronic irradiation was provided by 137СsCl with a total dose of 17 cGy and a dose rate of 6.8×10-6 cGy/s. The acute irradiation experiment was performed on 21 days old plants at the 5.0 stage (Boyes 2001) by X-rays in a total dose of 5 Gy with a dose rate of 89 cGy/s. The length of stems and leaves was measured in post-irradiation period. The molecular genetic analysis was done using real-time PCR. We determined the relative expression of key flowering genes AP1, GI, FT, CO, ACT2 with UBQ10 used as reference genes. Statistical analysis of phenotypic parameters was done using Student’s t-test in GraphPad Prism 8 software. The quantitative PCR data were analyzed in the REST 2009 software, QIAGEN. Results. The plant groups differed significantly by the stem length (p>0,05). The study revealed decreased expression of CO, GI and FT genes in jin mutants. The overexpression of AP1 in jin mutants under chronic irradiation may cause cell division errors and impact flower development. In contrast, AP1 expression in WT plants was near to normal =1 under chronic irradiation. These results suggest the involvement of the jasmonate pathway in the regulation of plants flowering during the irradiation. Сonclusion. Based on the results of our study, we hypothesize that jasmonic acid has a stabilizing effect on the rate of cell differentiation in plants under chronic irradiation. Despite the uncovered role of jasmonic acid in Arabidopsis thaliana flowering the exact mechanism of its action remains unclear and requires further investigation.Keywords: jasmonate signaling, jasmonic acid, JA, flowering, ionizing radiation, real-time PCR, relative expression.
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