Gamma (γ)-irradiation of plants at low doses can provoke a broad range of growth-stimulating effects. In order to reveal universal target genes that are involved in molecular pathways of radiation hormesis establishment, we studied nine barley cultivars for their tolerance to γ-irradiation of seeds. Four morphological traits were assessed in barley seedlings after γ-irradiation of seeds at 20 Gy. Nine cultivars were sorted according to the sensitivity to irradiation as γ-stimulated, “no morphological effect”, or γ-inhibited. Gene expression of 17 candidate genes was evaluated for the 7 most contrasting cultivars. Changes in expression of barley homologues of PM19L and CML31 were suggested as possible determinants of radiation hormesis effect. The possible role of jasmonate signaling in roots in radiation growth stimulations was revealed. Morphological analysis and gene expression study showed that the genetic background of a cultivar plays an important role in eustress responses to low-dose γ-irradiation of seeds.

中文翻译：

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研究辐射大麦品种中的基因表达：像PM19L和CML31一样的表达可能是辐射增效作用的决定因素

用低剂量的植物进行伽玛（γ）辐照可引起广泛的生长刺激作用。为了揭示参与辐射激素建立分子途径的通用靶基因，我们研究了九个大麦品种对种子γ辐射的耐受性。对大麦幼苗在20 Gyγ射线辐照后评估了四个形态性状。根据对辐照的敏感性（γ刺激，“无形态学效应”或γ抑制）对9个品种进行分类。对7个最相反的品种评估了17个候选基因的基因表达。PM19L和CML31大麦同源物表达的变化提示可能是辐射兴奋效应的决定因素。揭示了茉莉酸酯信号传导在辐射生长刺激的根中的可能作用。形态分析和基因表达研究表明，品种的遗传背景在低剂量γ-射线辐照对种子的轻度胁迫中起着重要作用。