Abstract
Histone modification plays a significant role in plant responses to abiotic stress. However, there are little scientific studies available on the involvement of dynamic changes in histone modification in the heat stress response in maize. The present investigation was aimed to analyze the epigenetic mechanisms involved in regulating the physiological and biochemical alterations in maize seedlings under heat stress. Our results and observations indicated an increase in electrolyte leakage and hydrolytic activity of the plasma membrane H+-ATPase as well as the high pigment content and reactive oxygen species (ROS) content under high temperature. Furthermore, decondensation of ribosomal DNA (rDNA) chromatin and a simultaneous increase in rRNA gene expression were observed during heat stress, accompanied by a genome-wide increase in the levels of histone H3K4me2 and H3K9ac. Additionally, chromatin immunoprecipitation (ChIP) analysis revealed that alterations in H3K4me2 and H3K9ac levels occurred in promoter regions, which were found to be associated with the upregulation of heat stress factor (Hsf) and rRNA genes. In conclusion, short-term heat stress induces dynamic histone alterations which are associated with Hsf and rRNA gene transcription, accompanied by perturbations of cell membranes and an increase in ROS during acclimation in maize seedlings.
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This work was supported by the National Natural Science Foundation of China (Nos. 31571265 and 31801026) and the Fundamental Research Funds for Central Public Welfare Research Institutes (562018Y-5949).
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Key Message
Short-term heat stress induces dynamic changes of histone H3K9ac and H3K4me2 which may participate in the physiological changes, rDNA chromatin decondensation, and gene transcriptional regulation.
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Fig. S1.
Alteration in maize leaf growth during heat stress treatment and recovery. (a) Growth status of seedling leaves under heat stress. (b) Relative weight. (c) Relative length. One hundred seedlings were measured at each time point. The x-axis represented different time points: 0, the control value was defined as 1.0; H1, 1 h of heat treatment; H2, 2 h of heat treatment; H5, 5 h of heat treatment; H24, 24 h of heat treatment; R1, 1 h recovery after 24 h of heat treatment; R2, 2 h recovery after 24 h of heat treatment; R5, 5 h recovery after 24 h of heat treatment; R24, 24 h recovery period after 24 h of heat treatment. Samples were collected from three independent experiments and assays for each sample were repeated three times. All data were represented as the mean ± SD. Error bars represent standard error (n=3). Asterisk (*) represented p<0.05 as compared to control by Student’s t-test. (PNG 172 kb)
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Fig. S2.
Heat-induced alterations in the plasma membrane. (a) Alterations in membrane permeability in the leaves of maize seedlings during heat stress treatment and recovery. The ion leakage rate was increased after heat treatment. (b) Alterations in plasma membrane H+-ATPase hydrolytic activity in the leaves of maize seedlings during treatment and recovery from heat stimuli. The x-axis represented different time points: 0, the control value was defined as 1.0; H1, 1 h of heat treatment; H2, 2 h of heat treatment; H5, 5 h of heat treatment; H24, 24 h of heat treatment; R1, 1 h of recovery period after 24 h of heat treatment; R2, 2 h of recovery period after 24 h of heat treatment; R5, 5 h of recovery period after 24 h heat treatment; R24, 24 h of recovery period after 24 h of heat treatment. Samples were collected from three independent experiments and assays for each sample were repeated three times. All data were represented as the mean ± SD. Error bars represented standard error (n=3). Asterisk (*) represented p<0.05 and *** represented p<0.01 in comparison to control by Student’s t-test. (PNG 206 kb)
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Fig. S3
Changes in the contents of chlorophyll a, b and carotenoid in the leaves of maize seedlings during the process of treatment and recovery from heat stress. Time points indicated on the x-axis are as follows: 0, basal condition before stress treatment; H1, 1 h heat treatment; H2, 2 h heat treatment; H5, 5 h heat treatment; H24, 24 h heat treatment; R1, 1 h recovery after 24 h heat treatment; R2, 2 h recovery after 24 h heat treatment; R5, 5 h recovery after 24 h heat treatment; R24, 24 h recovery after 24 h heat treatment. Each assay was repeated three times for every sample from three independent experiments. The bars represent standard errors (n=3). * p<0.05, *** p<0.01, as compared with the control group with the t-test. (PNG 153 kb)
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Fig. S4.
Alterations in ROS content and enzyme activities in the leaves of maize seedlings during treatment and recovery from heat stimulation. (a) H2O2 concentration. (b) O2- concentration. (c) MDA concentration. (d) SOD activity. (e) CAT activity. (f) POD activity. Relative concentrations and the enzyme activity of the control group (0 h) were defined as 1.0. The x-axis represented different time points: 0, the control value was defined as 1.0; H1, 1 h of heat treatment; H2, 2 h of heat treatment; H5, 5 h of heat treatment; H24, 24 h of heat treatment; R1, 1 h of recovery period after 24 h of heat treatment; R2, 2 h of recovery period after 24 h of heat treatment; R5, 5 h of recovery period after 24 h of heat treatment; R24, 24 h of recovery period after 24 h of heat treatment. Samples were collected from three independent experiments and assays for each sample were repeated three times. All data were represented as the mean ± SD. Error bars were represented as standard error (n=3). Asterisk (*) represented p<0.05 as compared to control plants by Student’s t-test. (PNG 309 kb)
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Fig. S5.
Western blot analysis of the change in level of H3K9ac and H3K4me2 in the leaves of maize seedlings during the process of treatment and recovery from heat stress. Histone H3 was used as a loading control. The x-axis represents different time points: 0, the control value was defined as 1.0; H1, 1 h heat treatment; H2, 2 h heat treatment; H5, 5 h heat treatment; H24, 24 h heat treatment; R1, 1 h recovery after 24 h heat treatment; R2, 2 h recovery after 24 h heat treatment; R5, 5 h recovery after 24 h heat treatment; R24, 24 h recovery after 24 h heat treatment. (PNG 184 kb)
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Fig. S6.
Immunostaining analysis of the change in levels of H3K9ac (a) and H3K4me2 (b) in the leaves of maize seedlings during the process of treatment and recovery from heat stress. DAPI was used as a counterstain. More than 500 nuclei were analyzed. Bar=10 μm. (PNG 195 kb)
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Hou, H., Zhao, L., Zheng, X. et al. Dynamic changes in histone modification are associated with upregulation of Hsf and rRNA genes during heat stress in maize seedlings. Protoplasma 256, 1245–1256 (2019). https://doi.org/10.1007/s00709-019-01364-4
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DOI: https://doi.org/10.1007/s00709-019-01364-4