Abstract
Barley (Hordeum vulgare L.) is the fourth largest cereal crop in the world with extensive adaptability in diverse environments. There is increasing evidence that epigenetics contributes to plant evolution and adaptation. However, epigenetic variation in barley and their correlations with genetic variation remains largely unknown. In this study, we investigated epigenetic and genetic diversity in 48 Tibetan wild distribution (TWD) barley accessions, 24 Chinese cultivars (CC), and 24 foreign cultivars (FC) using DNA methylation-sensitive amplified polymorphism and simple sequence repeats. We found a relatively high level of epigenetic (I = 0.639 and h = 0.450) and genetic (I = 0.637 and h = 0.446) diversity in barley, and a significant correlation between epigenetic and genetic variation in barley (R2 = 0.160, P < 0.001). No differences in genetic variation were observed among TWD, CC and FC populations. However, the TWD population had significantly higher epigenetic diversity (I = 0.607 and h = 0.424, P < 0.001) than both cultivated populations (FC: I = 0.584 and h = 0.402; CC: I = 0.544 and h = 0.372). Also, the TWD population had significantly higher average hemi-methylation (20.35%) and full-methylation (25.37%) levels than both cultivated populations (FC: 16.13% and 20.98%, respectively; CC: 15.98% and 18.95%, respectively). This study has provided valuable information on DNA methylation variation across diverse barley accessions and indicated that epigenetic variations might be another factor contributing to barley diversity.
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Acknowledgements
We are grateful to Prof. Ying Ding from the College of Life Sciences, Wuhan University, for providing Tibetan wild distribution barley accessions.
Funding
The project funds were provided by the National Natural Science Foundation of China (31501309, 31201212) and National Key R&D Program of China (2016YFD0102101).
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YX and CL designed the experiments; BL, QG, WH, WZ, and GC conducted the research; YX and BL performed the statistical analyses; BL, XY, and CL wrote and finalized the manuscript.
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10722_2020_1019_MOESM3_ESM.tif
Supplementary Fig. 1 Partial SSR molecular bands generated with Chr5-Ind5026 and monitored by capillary gel electrophoresis. W: TWD individuals, F: FC individuals, C: CC individuals (TIFF 492 kb)
10722_2020_1019_MOESM4_ESM.tif
Supplementary Fig. 2 Partial MSAP bands monitored by capillary gel electrophoresis. MSAP markers generated with the selected primer combinations of BstYI-C + TAA/HpaII/MspI (a) + AT and BstYI-T + TGC/HpaII/MspI + TCAA (b). H and M represent genomic DNA sample digested by BstYI/HpaII and BstYI/MspI, respectively (TIFF 3013 kb)
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Li, B., Gong, Q., Hua, W. et al. Genetic and epigenetic variations in barley (Hordeum vulgare L.) using SSR and MSAP approaches. Genet Resour Crop Evol 68, 729–739 (2021). https://doi.org/10.1007/s10722-020-01019-x
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DOI: https://doi.org/10.1007/s10722-020-01019-x